Micropayments – Coin Center

"JoyStream is a BitTorrent client which has the capacity to automatically negotiate and execute Bitcoin micropayments in exchange for seeding." -Why We Need the AirBnB of BitTorrent

submitted by bitcoinik to Bitcoin [link] [comments]

"JoyStream is a BitTorrent client which has the capacity to automatically negotiate and execute Bitcoin micropayments in exchange for seeding." -Why We Need the AirBnB of BitTorrent

submitted by coincrazyy to BitcoinAll [link] [comments]

Bitcoin Jukebox Exchanges Micropayments For Songs

Bitcoin Jukebox Exchanges Micropayments For Songs submitted by alanX to Bitcoin [link] [comments]

Bitcoin micropayments in exchange for seeding.

Bitcoin micropayments in exchange for seeding. submitted by coincrazyy to BitcoinAll [link] [comments]

Bitcoin Newcomers FAQ - Please read!

Welcome to the /Bitcoin Sticky FAQ

You've probably been hearing a lot about Bitcoin recently and are wondering what's the big deal? Most of your questions should be answered by the resources below but if you have additional questions feel free to ask them in the comments.
It all started with the release of the release of Satoshi Nakamoto's whitepaper however that will probably go over the head of most readers so we recommend the following videos for a good starting point for understanding how bitcoin works and a little about its long term potential:
Some other great resources include Lopp.net, the Princeton crypto series and James D'Angelo's Bitcoin 101 Blackboard series.
Some excellent writing on Bitcoin's value proposition and future can be found at the Satoshi Nakamoto Institute.
Some Bitcoin statistics can be found here and here. Developer resources can be found here. Peer-reviewed research papers can be found here.
Potential upcoming protocol improvements and scaling resources here and here.
The number of times Bitcoin was declared dead by the media can be found here (LOL!)

Key properties of Bitcoin

Where can I buy bitcoins?

Bitcoin.org and BuyBitcoinWorldwide.com are helpful sites for beginners. You can buy or sell any amount of bitcoin (even just a few dollars worth) and there are several easy methods to purchase bitcoin with cash, credit card or bank transfer. Some of the more popular resources are below, also check out the bitcoinity exchange resources for a larger list of options for purchases.
Here is a listing of local ATMs. If you would like your paycheck automatically converted to bitcoin use Bitwage.
Note: Bitcoins are valued at whatever market price people are willing to pay for them in balancing act of supply vs demand. Unlike traditional markets, bitcoin markets operate 24 hours per day, 365 days per year. Preev is a useful site that that shows how much various denominations of bitcoin are worth in different currencies. Alternatively you can just Google "1 bitcoin in (your local currency)".

Securing your bitcoins

With bitcoin you can "Be your own bank" and personally secure your bitcoins OR you can use third party companies aka "Bitcoin banks" which will hold the bitcoins for you.
Note: For increased security, use Two Factor Authentication (2FA) everywhere it is offered, including email!
2FA requires a second confirmation code to access your account making it much harder for thieves to gain access. Google Authenticator and Authy are the two most popular 2FA services, download links are below. Make sure you create backups of your 2FA codes.
Google Auth Authy OTP Auth
Android Android N/A

Watch out for scams

As mentioned above, Bitcoin is decentralized, which by definition means there is no official website or Twitter handle or spokesperson or CEO. However, all money attracts thieves. This combination unfortunately results in scammers running official sounding names or pretending to be an authority on YouTube or social media. Many scammers throughout the years have claimed to be the inventor of Bitcoin. Websites like bitcoin(dot)com and the btc subreddit are active scams. Almost all altcoins (shitcoins) are marketed heavily with big promises but are really just designed to separate you from your bitcoin. So be careful: any resource, including all linked in this document, may in the future turn evil. Don't trust, verify. Also as they say in our community "Not your keys, not your coins".

Where can I spend bitcoins?

Check out spendabit or bitcoin directory for millions of merchant options. Also you can spend bitcoin anywhere visa is accepted with bitcoin debit cards such as the CashApp card. Some other useful site are listed below.
Store Product
Gyft Gift cards for hundreds of retailers including Amazon, Target, Walmart, Starbucks, Whole Foods, CVS, Lowes, Home Depot, iTunes, Best Buy, Sears, Kohls, eBay, GameStop, etc.
Spendabit, Overstock and The Bitcoin Directory Retail shopping with millions of results
ShakePay Generate one time use Visa cards in seconds
NewEgg and Dell For all your electronics needs
Bitwa.la, Coinbills, Piixpay, Bitbill.eu, Bylls, Coins.ph, Bitrefill, LivingRoomofSatoshi, Coinsfer, and more Bill payment
Menufy, Takeaway and Thuisbezorgd NL Takeout delivered to your door
Expedia, Cheapair, Destinia, Abitsky, SkyTours, the Travel category on Gyft and 9flats For when you need to get away
Cryptostorm, Mullvad, and PIA VPN services
Namecheap, Porkbun Domain name registration
Stampnik Discounted USPS Priority, Express, First-Class mail postage
Coinmap and AirBitz are helpful to find local businesses accepting bitcoins. A good resource for UK residents is at wheretospendbitcoins.co.uk.
There are also lots of charities which accept bitcoin donations.

Merchant Resources

There are several benefits to accepting bitcoin as a payment option if you are a merchant;
If you are interested in accepting bitcoin as a payment method, there are several options available;

Can I mine bitcoin?

Mining bitcoins can be a fun learning experience, but be aware that you will most likely operate at a loss. Newcomers are often advised to stay away from mining unless they are only interested in it as a hobby similar to folding at home. If you want to learn more about mining you can read more here. Still have mining questions? The crew at /BitcoinMining would be happy to help you out.
If you want to contribute to the bitcoin network by hosting the blockchain and propagating transactions you can run a full node using this setup guide. If you would prefer to keep it simple there are several good options. You can view the global node distribution here.

Earning bitcoins

Just like any other form of money, you can also earn bitcoins by being paid to do a job.
Site Description
WorkingForBitcoins, Bitwage, Cryptogrind, Coinality, Bitgigs, /Jobs4Bitcoins, BitforTip, Rein Project Freelancing
Lolli Earn bitcoin when you shop online!
OpenBazaar, Purse.io, Bitify, /Bitmarket, 21 Market Marketplaces
/GirlsGoneBitcoin NSFW Adult services
A-ads, Coinzilla.io Advertising
You can also earn bitcoins by participating as a market maker on JoinMarket by allowing users to perform CoinJoin transactions with your bitcoins for a small fee (requires you to already have some bitcoins.

Bitcoin-Related Projects

The following is a short list of ongoing projects that might be worth taking a look at if you are interested in current development in the bitcoin space.
Project Description
Lightning Network Second layer scaling
Blockstream, Rootstock and Drivechain Sidechains
Hivemind and Augur Prediction markets
Tierion and Factom Records & Titles on the blockchain
BitMarkets, DropZone, Beaver and Open Bazaar Decentralized markets
JoinMarket and Wasabi Wallet CoinJoin implementation
Coinffeine and Bisq Decentralized bitcoin exchanges
Keybase Identity & Reputation management
Abra Global P2P money transmitter network
Bitcore Open source Bitcoin javascript library

Bitcoin Units

One Bitcoin is quite large (hundreds of £/$/€) so people often deal in smaller units. The most common subunits are listed below:
Unit Symbol Value Info
bitcoin BTC 1 bitcoin one bitcoin is equal to 100 million satoshis
millibitcoin mBTC 1,000 per bitcoin used as default unit in recent Electrum wallet releases
bit bit 1,000,000 per bitcoin colloquial "slang" term for microbitcoin (μBTC)
satoshi sat 100,000,000 per bitcoin smallest unit in bitcoin, named after the inventor
For example, assuming an arbitrary exchange rate of $10000 for one Bitcoin, a $10 meal would equal:
For more information check out the Bitcoin units wiki.
Still have questions? Feel free to ask in the comments below or stick around for our weekly Mentor Monday thread. If you decide to post a question in /Bitcoin, please use the search bar to see if it has been answered before, and remember to follow the community rules outlined on the sidebar to receive a better response. The mods are busy helping manage our community so please do not message them unless you notice problems with the functionality of the subreddit.
Note: This is a community created FAQ. If you notice anything missing from the FAQ or that requires clarification you can edit it here and it will be included in the next revision pending approval.
Welcome to the Bitcoin community and the new decentralized economy!
submitted by BitcoinFan7 to Bitcoin [link] [comments]

The Bitcoin Economic Model & The Bitcoin Network Model

Bitcoin's economic model is the foundation for a whole new internet architecture, the Bitcoin network model, but many people dislike the idea of replacing the current TCP model with a 'pay to view' or 'pay per click' model in which the entire internet is run on top of an economic model.
In the Bitcoin model, a mouse click costs 1/10000th of a penny, a google search might cost 1/100th of a penny, a webpage might cost 1/10th of a penny and a Netflix video might cost a penny per minute.
Why is this important? It opens up a whole new realm of possibilities in terms of how you get paid for creating content, and it opens up huge new opportunities for entrepreneurs to open businesses based on micropayments.
In simple terms, an internet based on Bitcoin allows users to set the price at which others can open a connection to them. In other words, if you want to call me, I can choose how much you have to pay to talk to me. If you're my best friend, I can charge you less than a penny per minute. If you're my ex-girlfriend, I can charge you $5 per minute. It's high enough that if you have to talk to me, you can call me, but you won't waste my time... and if you do, I can always raise the price again.
It sounds like a frivolous example, but take the model and apply it to advertisers. How many adverts do you get bombarded with every day that you don't want to see? In your youtube videos for example? Or on your facebook feed. Well, in the bitcoin model, where the internet itself is built on bitcoin, you can charge advertisers to open a connection to you. So that Grammarly advert you hate? You can charge them $100 to watch their advert. Or, you can set a low rate, like $1 and if they think you're worth it, they can set a budget as to how many advertising dollars they're willing to waste on trying to acquire your custom. But crucially, YOU GET THEIR CASH.
It's a much better model. If you don't want to see any Grammarly adverts you just set the rate at which Grammarly can connect to you to $10,000 per second and never hear from them again.
In Dimely, you can set the rate at which others connect to you. So let's say you're an English teacher, or an online Psychotherapist, or a Legal Consultant. You can charge customers for your time. You set your rate per minute, and they connect to you for as long as they can afford to. You can even negotiate the price in the call, and adjust your price for different clients and the blockchain acts as a permanent record of the exchange which is useful for contractual purposes.
Once you get your head round this fundamental idea, then you start to realize the possibilities. You can charge people to open a connection to you, and your content.
In an enterprise situation, you might be a Hollywood movie studio, publishing a movie to the blockchain. It might cost you $100,000 to upload a single movie at today's prices, but you could stream the movie direct to people's wallets, and they'd pay $1 a time (for example). If you have a million views, you've just made $900,000 revenue. That's a good peer-to-peer distribution model for Hollywood movies, but you can do the same for music, self produced or mass produced, as well as art and literature, blogs, websites, and any other kind of data you can think of.
That's Bitcoin.
Bitcoin is BSV.
submitted by Jo_Bones to bsv [link] [comments]

LBRY and payment channel technology

First, what am I talking about and how does it work?
Payment channel is a special transaction that allows off-chain balance exchange between two peers, with the final balnance being settled later on-chain
In short how does it work:
There's virtually no limit of how many transactions are pushed, or how small they are, since it ends up as one on-chain transaction anyway.
Well, I was thinking - back in the early days of bitcoin there was a working proof of concept, that eventually evolved into Lightning Network. But we don't need Lightning Network here. We need storage incentives.
If you use Odysee, then you don't care since storage is provided by somone else, however, if you're storing data yourself, even moderate traffic may bring your bandwidth capacity to its knees.
However, if we have payment channels implemented, peers can pay each other for consumed bandwidth, and so, storing the old files becomes an actually profitable business model
My question is: Does LBRY blockchain support payment channel schemes? AFAIK this was a thing in Bitcoin back in 2012, so assuming LBRY is modelled after Bitcoin, it should be possible here as well
submitted by mcgravier to lbry [link] [comments]

Output value, or rather lack of...

How come output value( The total value of all transaction outputs per day ) of bitcoin has stayed basically the same ( https://www.blockchain.com/charts/output-volume?timespan=all&daysAverageString=7 ) for so long and not actually grow as more bitcoins are mined?
I did some googling and it doesnt seem to be talked about and to me it seems like it should weird bitcoin-holders out, it would for me atleast if I had bought into the scheme....
Just looked through stats and it looked odd, maybe I'am just retarded, let me know.
submitted by Divad5000 to Buttcoin [link] [comments]

Thanks to all who submitted questions for Shiv Malik in the GAINS AMA yesterday, it was great to see so much interest in Data Unions! You can read the full transcript here:

Thanks to all who submitted questions for Shiv Malik in the GAINS AMA yesterday, it was great to see so much interest in Data Unions! You can read the full transcript here:

Gains x Streamr AMA Recap

Thanks to everyone in our community who attended the GAINS AMA yesterday with, Shiv Malik. We were excited to see that so many people attended and gladly overwhelmed by the amount of questions we got from you on Twitter and Telegram. We decided to do a little recap of the session for anyone who missed it, and to archive some points we haven’t previously discussed with our community. Happy reading and thanks to Alexandre and Henry for having us on their channel!
What is the project about in a few simple sentences?
At Streamr we are building a real-time network for tomorrow’s data economy. It’s a decentralized, peer-to-peer network which we are hoping will one day replace centralized message brokers like Amazon’s AWS services. On top of that one of the things I’m most excited about are Data Unions. With Data Unions anyone can join the data economy and start monetizing the data they already produce. Streamr’s Data Union framework provides a really easy way for devs to start building their own data unions and can also be easily integrated into any existing apps.
Okay, sounds interesting. Do you have a concrete example you could give us to make it easier to understand?
The best example of a Data Union is the first one that has been built out of our stack. It's called Swash and it's a browser plugin.
You can download it here: http://swashapp.io/
And basically it helps you monetize the data you already generate (day in day out) as you browse the web. It's the sort of data that Google already knows about you. But this way, with Swash, you can actually monetize it yourself. The more people that join the union, the more powerful it becomes and the greater the rewards are for everyone as the data product sells to potential buyers.
Very interesting. What stage is the project/product at? It's live, right?
Yes. It's live. And the Data Union framework is in public beta. The Network is on course to be fully decentralized at some point next year.
How much can a regular person browsing the Internet expect to make for example?
So that's a great question. The answer is no one quite knows yet. We do know that this sort of data (consumer insights) is worth hundreds of millions and really isn't available in high quality. So With a union of a few million people, everyone could be getting 20-50 dollars a year. But it'll take a few years at least to realise that growth. Of course Swash is just one data union amongst many possible others (which are now starting to get built out on our platform!)
With Swash, I believe they now have 3,000 members. They need to get to 50,000 before they become really viable but they are yet to do any marketing. So all that is organic growth.
I assume the data is anonymized btw?
Yes. And there in fact a few privacy protecting tools Swash supplys to its users.
How does Swash compare to Brave?
So Brave really is about consent for people's attention and getting paid for that. They don't sell your data as such.
Swash can of course be a plugin with Brave and therefore you can make passive income browsing the internet. Whilst also then consenting to advertising if you so want to earn BAT.
Of course it's Streamr that is powering Swash. And we're looking at powering other DUs - say for example mobile applications.
The holy grail might be having already existing apps and platforms out there, integrating DU tech into their apps so people can consent (or not) to having their data sold - and then getting a cut of that revenue when it does sell.
The other thing to recognise is that the big tech companies monopolise data on a vast scale - data that we of course produce for them. That is stifling innovation.
Take for example a competitor map app. To effectively compete with Google maps or Waze, they need millions of users feeding real time data into it.
Without that - it's like Google maps used to be - static and a bit useless.
Right, so how do you convince these big tech companies that are producing these big apps to integrate with Streamr? Does it mean they wouldn't be able to monetize data as well on their end if it becomes more available through an aggregation of individuals?
If a map application does manage to scale to that level then inevitably Google buys them out - that's what happened with Waze.
But if you have a data union which bundles together the raw location data of millions of people then any application builder can come along and license that data for their app. This encourages all sorts of innovation and breaks the monopoly.
We're currently having conversations with Mobile Network operators to see if they want to pilot this new approach to data monetization. And that's what even more exciting. Just be explicit with users - do you want to sell your data? Okay, if yes, then which data point do you want to sell.
Then the mobile network operator (like T-mobile for example) then organises the sale of the data of those who consent and everyone gets a cut.
Streamr - in this example provides the backend to port and bundle the data, and also the token and payment rail for the payments.
So for big companies (mobile operators in this case), it's less logistics, handing over the implementation to you, and simply taking a cut?
It's a vision that we'll be able to talk more about more concretely in a few weeks time 😁
Compared to having to make sense of that data themselves (in the past) and selling it themselves
Sort of.
We provide the backened to port the data and the template smart contracts to distribute the payments.
They get to focus on finding buyers for the data and ensuring that the data that is being collected from the app is the kind of data that is valuable and useful to the world.
(Through our sister company TX, we also help build out the applications for them and ensure a smooth integration).
The other thing to add is that the reason why this vision is working, is that the current data economy is under attack. Not just from privacy laws such as GDPR, but also from Google shutting down cookies, bidstream data being investigated by the FTC (for example) and Apple making changes to IoS14 to make third party data sharing more explicit for users.
All this means that the only real places for thousands of multinationals to buy the sort of consumer insights they need to ensure good business decisions will be owned by Google/FB etc, or from SDKs or through this method - from overt, rich, consent from the consumer in return for a cut of the earnings.
A couple of questions to get a better feel about Streamr as a whole now and where it came from. How many people are in the team? For how long have you been working on Streamr?
We are around 35 people with one office in Zug, Switzerland and another one in Helsinki. But there are team members all over the globe, we’ve people in the US, Spain, the UK, Germany, Poland, Australia and Singapore. I joined Streamr back in 2017 during the ICO craze (but not for that reason!)
And did you raise funds so far? If so, how did you handle them? Are you planning to do any future raises?
We did an ICO back in Sept/Oct 2017 in which we raised around 30 Millions CHF. The funds give us enough runway for around five/six years to finalize our roadmap. We’ve also simultaneously opened up a sister company consultancy business, TX which helps enterprise clients implementing the Streamr stack. We've got no more plans to raise more!
What is the token use case? How did you make sure it captures the value of the ecosystem you're building
The token is used for payments on the Marketplace (such as for Data Union products for example) also for the broker nodes in the Network. ( we haven't talked much about the P2P network but it's our project's secret sauce).
The broker nodes will be paid in DATAcoin for providing bandwidth. We are currently working together with Blockscience on our tokeneconomics. We’ve just started the second phase in their consultancy process and will be soon able to share more on the Streamr Network’s tokeneconoimcs.
But if you want to summate the Network in a sentence or two - imagine the Bittorrent network being run by nodes who get paid to do so. Except that instead of passing around static files, it's realtime data streams.
That of course means it's really well suited for the IoT economy.
Well, let's continue with questions from Twitter and this one comes at the perfect time. Can Streamr Network be used to transfer data from IOT devices? Is the network bandwidth sufficient? How is it possible to monetize the received data from a huge number of IOT devices? From u/ EgorCypto
Yes, IoT devices are a perfect use case for the Network. When it comes to the network’s bandwidth and speed - the Streamr team just recently did extensive research to find out how well the network scales.
The result was that it is on par with centralized solutions. We ran experiments with network sizes between 32 to 2048 nodes and in the largest network of 2048 nodes, 99% of deliveries happened within 362 ms globally.
To put these results in context, PubNub, a centralized message brokering service, promises to deliver messages within 250 ms — and that’s a centralized service! So we're super happy with those results.
Here's a link to the paper:
While we're on the technical side, second question from Twitter: Can you be sure that valuable data is safe and not shared with service providers? Are you using any encryption methods? From u/ CryptoMatvey
Yes, the messages in the Network are encrypted. Currently all nodes are still run by the Streamr team. This will change in the Brubeck release - our last milestone on the roadmap - when end-to-end encryption is added. This release adds end-to-end encryption and automatic key exchange mechanisms, ensuring that node operators can not access any confidential data.
If BTW - you want to get very technical the encryption algorithms we are using are: AES (AES-256-CTR) for encryption of data payloads, RSA (PKCS #1) for securely exchanging the AES keys and ECDSA (secp256k1) for data signing (same as Bitcoin and Ethereum).
Last question from Twitter, less technical now :) In their AMA ad, they say that Streamr has three unions, Swash, Tracey and MyDiem. Why does Tracey help fisherfolk in the Philippines monetize their catch data? Do they only work with this country or do they plan to expand? From u/ alej_pacedo
So yes, Tracey is one of the first Data Unions on top of the Streamr stack. Currently we are working together with the WWF-Philippines and the UnionBank of the Philippines on doing a first pilot with local fishing communities in the Philippines.
WWF is interested in the catch data to protect wildlife and make sure that no overfishing happens. And at the same time the fisherfolk are incentivized to record their catch data by being able to access micro loans from banks, which in turn helps them make their business more profitable.
So far, we have lots of interest from other places in South East Asia which would like to use Tracey, too. In fact TX have already had explicit interest in building out the use cases in other countries and not just for sea-food tracking, but also for many other agricultural products.
(I think they had a call this week about a use case involving cows 😂)
I recall late last year, that the Streamr Data Union framework was launched into private beta, now public beta was recently released. What are the differences? Any added new features? By u/ Idee02
The main difference will be that the DU 2.0 release will be more reliable and also more transparent since the sidechain we are using for micropayments is also now based on blockchain consensus (PoA).
Are there plans in the pipeline for Streamr to focus on the consumer-facing products themselves or will the emphasis be on the further development of the underlying engine?by u/ Andromedamin
We're all about what's under the hood. We want third party devs to take on the challenge of building the consumer facing apps. We know it would be foolish to try and do it all!
As a project how do you consider the progress of the project to fully developed (in % of progress plz) by u/ Hash2T
We're about 60% through I reckon!
What tools does Streamr offer developers so that they can create their own DApps and monetize data?What is Streamr Architecture? How do the Ethereum blockchain and the Streamr network and Streamr Core applications interact? By u/ CryptoDurden
We'll be releasing the Data UNion framework in a few weeks from now and I think DApp builders will be impressed with what they find.
We all know that Blockchain has many disadvantages as well,
So why did Streamr choose blockchain as a combination for its technology?
What's your plan to merge Blockchain with your technologies to make it safer and more convenient for your users? By u/ noonecanstopme
So we're not a blockchain ourselves - that's important to note. The P2P network only uses BC tech for the payments. Why on earth for example would you want to store every single piece of info on a blockchain. You should only store what you want to store. And that should probably happen off chain.
So we think we got the mix right there.
What were the requirements needed for node setup ? by u/ John097
Good q - we're still working on that but those specs will be out in the next release.
How does the STREAMR team ensure good data is entered into the blockchain by participants? By u/ kartika84
Another great Q there! From the product buying end, this will be done by reputation. But ensuring the quality of the data as it passes through the network - if that is what you also mean - is all about getting the architecture right. In a decentralised network, that's not easy as data points in streams have to arrive in the right order. It's one of the biggest challenges but we think we're solving it in a really decentralised way.
What are the requirements for integrating applications with Data Union? What role does the DATA token play in this case? By u/ JP_Morgan_Chase
There are no specific requirements as such, just that your application needs to generate some kind of real-time data. Data Union members and administrators are both paid in DATA by data buyers coming from the Streamr marketplace.
Regarding security and legality, how does STREAMR guarantee that the data uploaded by a given user belongs to him and he can monetize and capitalize on it? By u/ kherrera22
So that's a sort of million dollar question for anyone involved in a digital industry. Within our system there are ways of ensuring that but in the end the negotiation of data licensing will still, in many ways be done human to human and via legal licenses rather than smart contracts. at least when it comes to sizeable data products. There are more answers to this but it's a long one!
Okay thank you all for all of those!
The AMA took place in the GAINS Telegram group 10/09/20. Answers by Shiv Malik.
submitted by thamilton5 to streamr [link] [comments]

Summary of Tau-Chain Monthly Video Update - July 2020

Agoras Live: Five functionalities complete: 1. Registration 2. Login 3. User Profile Page 4. Calendar 5. Categories List 6. Wallet Screen Payments: Decided that implementing lightning would be too complex. Instead, we decided to implement our own micropayment mechanism using the native BTC multisig addresses. We are going to use the Omni wallet for payments. TML: Continued debugging, getting a TML demo and test cases ready. Hiring: More hiring efforts to increase team size. Timelines: Committing ourselves to a release of Agoras Live and a basic version of discussions in TML in 2020.
Umar: Been working on making improvements to the context free grammar parsing. We now are able to add constraints to productions in the grammar, allowing us to recognize grammars that are context sensitive. Developed test cases for that, too.
Tomas: Fixed issues in TML and ran several steps in a TML program. Now adding more tests to make sure everything is stable and won’t break. Also been working on a TML tutorial, a recorded script based on the intro to TML which was contained in the TML Playground. Also new features are going to be covered such as arithmetics.
Kilian: More outreach & follow-ups to potential partner universities. Positive response by a professor based in Toronto, presented to him our project. Also, response by KULeuven, Belgium, who unfortunately don’t see a good fit in our project. We’ve had one applicant for the IDNI Grant program and currently are evaluating his proposal. Also, we’ve had an applicant from Bangalore, India for the IDNI Ambassador program and we also have been discussing his proposal. Translation Bounties: We’ve had the blog post “The New Tau” translated to Chinese and have been reviewing the translation. We are going to publish the translation on our website and on the Bitcointalk Chinese forum section. Still to be claimed: German translation of “The New Tau”. Done more effort on reach out to potential tribe channels: Research groups, LinkedIn groups, Facebook groups. Most represented keywords: Complex Adaptive Systems, NLP, Computational Linguistics. Usual feedback: Likes but no further interaction. Created an FAQ answering all possible questions surrounding IDNI, Tau & Agoras Idea: Hosting a virtual panel to spread the word about our project among the scientific community, as well as to create some visual content for our community. Two professors are interested in participating, one from Argentina with a focus in semantic parsing, the other one from the University of Washington with a focus on human-computer interaction and social computing. First step: organizing a pre-panel discussion where in 1on1 calls with the professors we get an opinion of them about what we are doing.
Andrei: Agoras Live: Implemented mail system so users now get their mails (e.g. registration email). Improved UX together with Mo’az, e.g. user profiles. Token creation for accessing calls to identify and charge users. Customized Jitsi interface to suit our needs: E.g. display of how much time passed in a call and how much it costs. Next up: Further improve UX; make sure everything works as intended.
Mo’az: Almost finished the IDNI website. Added two more pages: Events & Bounties in collaboration with Fola & Kilian. Agoras Live: Finetuned all the website’s components in collaboration with Andrei.
Juan: Continued working on the payments system for Agoras Live. Had some delays due to the complexity of debugging such applications. Still, we made significant progress and got the funding transactions implemented over the Lightning network through the Omni layer. Spent time analyzing the minimum amount of BTC to pay for the fees associated to the Omni transactions. We aren’t using segregated witness native addresses and instead are using embedded segregated witness. So transaction sizes are enlarged and transaction fees are a bit higher. So there is a bit of finetuning analysis needed in order to enable the multisig address to pay for the closing & refund transactions. So to provide payment channels over the Omni layer, the main remaining technical detail we have to solve at this point is the closing transaction & the refund transaction.
Fola: Have been continuing to look for great talent in different areas. Continued working on website with Mo’az and Kilian. Been working on the branding for Tau & Agoras. Been getting external support to make sure the branding for Tau & Agoras will be as professional as it can be. Working on marketing efforts needed for the release of Agoras Live to get the media pack for marketing ready. Working together with external people to put a plan together for listing the Agoras token on more prominent exchanges as we get closer to release of Agoras Live.
Ohad: Continued working on restricted versions of second-order logic to understand how to implement them. There is a translation in the literature about how to convert second-order logic by Horn into Datalog. Also, I have been revisiting papers that deal with descriptive complexity of higher-order logic. They mention that they have a translation from second-order logic to QBF. I wasn’t able to find where they explain this translation but I wrote one of them and he said he will send me the paper. If so, that will be very good because we already have a QBF solver. Any binary decision diagram is already a QBF solver, so we can just translate arbitrary second-order logic formulas into QBF. This will be very helpful for us to implement second-order logic. Also, those papers mention several aspects that are relevant for self-interpretation, the laws of laws. Apparently, they suggest that certain fragments of higher-order logic may also support the laws of laws. But this is part of the papers that I didn’t have access to, so I have to wait to get further clarification. I also pushed the whitepaper significantly this month and hope we will be finishing it soon. Also, I was thinking about some optimizations for the parser and also was looking into the Lightning network. It was my mistake that I haven’t done so beforehand and if I had done it beforehand, I would have understood earlier, that Lightning is too much. It is too drastic of a change to how traditional payments work and there apparently is no reason to believe that it is secure. So I’m glad I discovered better now than later that it’s not something we’d like to rely on, although we can have it as an optional feature.
Q: With the project development taking longer than other projects such as Tezos, when can AGRS holders expect something to be released and, how can you reassure us that we made the right decision?
A: With regards to when we see some releases, it seems that we will see some releases in 2020. For comparing to Ethereum and Tezos: Let’s first talk about funding. Both projects had a lot of money. For Ethereum, the reason for is that it has probably done one of the most aggressive marketing campaigns in history. It was completely lacking any kind of honesty. It was simply aggressive. None of Ethereum’s visions and promises became true. It simply became an insecure platform for scams. None of their vision of creating a world computer, of creating a better society, a better currency, became true. Because of this aggressive marketing, they not only raised a lot of money, they also took the price to be so high in the market. If you remember the campaign of the flipping, they did a whole campaign on how they would overtake the marketcap of Bitcoin. For Tezos, they made maybe the largest ICO in history in terms of money, mainly because they came at the right time, at the top of the bubble in 2017, and also their promises for better coordination didn’t come true. Their solution is based on voting and based on Turing completeness and the only reason why they managed to gain such a market cap as of today, is not because they offer better currency, better society, better anything. It basically is a Ponzi-scheme because they offer very high interest rate by very high inflation (5,51%). The only reason why people buy Tezos is to get into this Ponzi-scheme. Because both Tezos and Ethereum lack any true economical or technological substance, their value will not sustain and this is true for almost all projects in the cryptocurrency world. In the software, high-tech market, if you come up with good tech and you do all the right things, you succeed big time. But if you don’t have it and you are purely relying on brainwashing people, it will not sustain. Of course, our solution is so disruptive and sustainable. We offer to do advancements for humanity and for economy.
Q: What three subjects would you first like to see discussed on Tau?
A: Of course, picking three subjects now is a bit speculative, but the first thing that comes to mind is the definitions of what good and bad means and what better and worse means. The second subject is the governance model over Tau. The third one is the specification of Tau itself and how to make it grow and evolve even more to suit wider audiences. The whole point of Tau is people collaborating in order to define Tau itself and to improve it over time, so it will improve up to infinity. This is the main thing, especially initially, that the Tau developers (or rather users) advance the platform more and more.
Q: What is stopping programmers using TML right now? If nothing, what is your opinion on why they aren’t?
A: There is nothing essentially missing in TML in order to let it release. And in fact, we are now working towards packaging it and bringing it towards a release level. For things like documentation, bug fixes, minor features, minor optimizations. We indeed actively work towards releasing TML 1.0 and then we can publish it in e.g. developers channels for them to use it.
submitted by m4nki to tauchain [link] [comments]

Defi Coins List In Detail

A Detail List Of Defi Coin












submitted by jakkkmotivator to Latest_Defi_News [link] [comments]

The Tangle badly needs a Stablecoin

The IOTA/Tangle community seems to be the least focused on tokenization. Here's why that's wrong:
IOTA may be feeless, but it's not free to use. Users are paying in:
  1. IOTA Volatility (regularly >1% daily)
  2. Exchange fees - moving in/out of IOTA to avoid volatility (0.25 - 1%)
Transaction fees, volatility or exchange fees. Value is lost, it doesn't matter how.
"but IOTA will stabilize as it grows"
Yes it will, but too slowly for it to matter.
Bitcoin isn't stable now at $100 billion, nor was it stable at $300 billion. IOTA won't be either. (IOTA would grow 250-750x in value to reach those market caps. Of course there will be enormous volatility on the way up)
Maybe they will be stable enough to use as a medium of exchange (MoE) if they ever reach $trillions.
What the Tangle needs most is a stablecoin. Picture this combination:
Ethereum DAI is supposed to be divisible to 18 decimal places - but gas fees stop you at 2 ($0.01)
Tangle DAI (TAI) could be truly divisible, with each unit created from 1i:
$1 to $0.01 = 100i ($1 million = 100Mi)
$1 to $0.0001 = 10Ki ($1 million = 10Gi)
This allows for stable micropayments, 100 - 10,000x smaller than what is currently possible.
Important points:
This has a couple of effects:
  1. Short/medium term, it removes most of the need for IOTA as an MoE.
  2. IOTA supply will need to be carefully considered/eventually increased. (At $0.10Mi - 1i costs $0.0000001. At $100Mi - 1i costs $0.0001)
  3. Long term, if IOTA grows from billions to trillions, it could become THE medium of exchange.
submitted by da-future-is-bright to IOTAmarkets [link] [comments]

READ: TERN - Massive upside potential - Ternio Cryptocurrency On BlockCard

TERN: Ternio’s own cryptocurrency that is based on the Stellar blockchain. It is a perfect value exchange for instant peer to peer micropayments and often confirms transactions in under 5 seconds for fractions of a penny. TERN can be exchanged peer to peer with any wallet that supports Stellar based assets, but is given even utility as the payment token used on all Ternio products including Lexicon and BlockCard.
Use Case: TERN is Ternio’s own digital currency and is the payment token used on all Ternio products. Every BlockCard uses TERN as the default spendable asset. All non-TERN deposits such as Bitcoin are converted to TERN when deposited in the BlockCard dashboard. The value of TERN is tied to usage of the BlockCard ecosystem. As users deposit on BlockCard, the value of TERN increases. As people spend, the value decreases. We have worked hard to build utility of TERN into the functionality of BlockCard. Live VISA Debit card with 6.38% crypto back on all spend.
BlockCard TERN link: https://getblockcard.com/supported-currencies/ternio/
CMC LINK: https://coinmarketcap.com/currencies/ternio/
Recent Video (Crypto Crow): https://youtu.be/tustQqYH7nM?t=409 Calling for 140,000% gain
submitted by TraderWal to CryptoMoonShots [link] [comments]

Bitcoin To Reach $397,000 By 2030 According To A Crypto Research Report

Bitcoin To Reach $397,000 By 2030 According To A Crypto Research Report

Researchers Also Predicted Ethereum To Reach Prices Of Over $3,600 By 2030
The latest report by CryptoReseach made a shocking price prediction that Bitcoin, the world’s largest cryptocurrency by market cap, would be over $397,000 by 2030. The researchers also noted that the price movement of the altcoin sector would closely follow Bitcoin.
Interestingly, researchers noted that the biggest price surge would be in the following five years, with another five years of steady price increases. Researchers believe that Bitcoin “is still in its early phase of mass adoption”, as the crypto leader is only working with 0,44% of its potential addressable market.
“If Bitcoin manages to penetrate and reach 10% of its potential market, we are seeing non-discounted prices of $400,000 per Bitcoin”, the report stated.
The CryptoResearch team also took one of the best-performing cryptocurrencies into account. It turns out that Ethereum (ETH) is anticipated to grow ten-fold over the course of the next five years, Litecoin (LTC) would surge from its present $83 price point to $2,252 by 2030. The report also includes Bitcoin Cash (BCH) and Stellar (XLM).
The price increases mean that Bitcoin would up its price by 4,000% by 2030, while Ethereum, Litecoin, and Bitcoin Cash would see a price increase of 1,600%, 5,000%, and 5,400%, respectively. Stellar, however, is set to gain the most, with an 11,000% total price increase by 2030.
Source: Crypto Research
The research company used the Target Addressable Market (TAM) metric, which is used to “determine the implied future price of crypto assets.” The researchers explained that they use numerous metrics to derive their predictions, such as tax evasion, remittance, store of value, micropayments, online transactions, online loans and gambling, crypto trading, and others.
CryptoResearch also noted that the off-chain velocity of the researched crypto assets is increasing, as opposed to their on-chain velocity numbers. Off-chain velocity is referred to as trading on crypto exchanges, while the on-chain velocity is a measure of the amount of transaction on a given blockchain. For instance, Bitcoin’s off-chain velocity and the price moved almost simultaneously.
“If cryptos see mass adoption in the long run, as well as short-run speculative or retail usage, their prices will definitely go up. However, the increase in off-chain velocity means cryptocurrencies are primarily used as speculation assets, rather than a store of value.” The researchers concluded.
submitted by Crypto_Browser to CryptoBrowser_EN [link] [comments]

FLETA Collaborates With Other Projects

FLETA Collaborates With Other Projects
Decentralized blockchain projects are gaining more and more popularity each day as the world realizes the potential of this blockchain technology. FLETA has decided to cooperate with other projects to drive the adoption of blockchain technology, facilitate technological innovations, and expand its network. In this article, we will introduce FLETA and other blockchain projects collaborating with us.


FLETA is a blockchain platform for decentralized applications aimed at solving some of the blockchain’s biggest hurdles. They have made advances to solve the scalability issues, but still keeping the blockchain fast and decentralized through a unique consensus algorithm known as Proof-of-Formulation.
Formulators are the key to FLETA’s technology. They are the block generators who mine and create new blocks. The mining process is configured in such a fair way that every formulator will get a chance to generate a block. This prevents conflicts and abuse because every miner is equal.
Generated blocks are confirmed and signed in real-time by Observer Nodes. They are responsible for securing the network, preventing DDOS attacks, and making forks impossible. Forks cannot happen on FLETA because 3 out of 5 Observers are required to sign and confirm the block. The first block with 3 signatures is the only valid one.
Proof-of-Formulation has been tested and verified in real-life scenarios. It is capable of achieving 14,000 transactions but remains highly secure due to the exclusive connection between Formulators and node Observers.

Matic Network

The Matic Network hopes to improve the scalability of Ethereum, by using PoS side chains, but without losing the critical elements of decentralization.
Matic’s multiple side chains possibly scale to millions of transactions each second in the future. The transaction fees are inexpensive, and its Plasma framework results in new blocks being generated in less than 2 seconds. It makes Matic a well-suited platform for micropayments.
FLETA is using Matic’s Plasma framework solutions on its Mainnet. FLETA has an auto-swap feature between the FLETA ERC-20 token and its native FLETA coin. The two projects have cooperated to improve the Deposit & Withdrawal options on FLETA and making them more decentralized.


TomoChain is a blockchain platform that uses a Proof-of-Stake Voting Consensus to combat scalability. It is based on a network of 150 Masternodes. This technology allows a network throughput of 2,000 transactions per second and a 2 seconds blocktime.
TomoChain can be used by developers to build their own DApps. Also, by taking advantage of the TomoX Protocol, they can launch a decentralized exchange. The TomoP Protocol is a privacy feature allowing anonymous transactions. When enabled, it conceals information about the transacting parties, used addresses, and transaction amounts.
FLETA and TomoChain have signed a technical agreement that foresees the use of the TomoZ Protocol that allows fees to be paid with different tokens. FLETA will be creating a FLETA Token that can provide broader use cases within the TomoChain ecosystem.


Neo is an open-source blockchain platform that uses smart contracts to digitize assets. The ownership of physical items from the real world can be registered, traded, and transferred via the Neo blockchain. Neo is a strong development platform that supports multiple coding languages and has an experienced development community.
FLETA and Neo have signed a strategic partnership, which entails the use of NeoVM on FLETA’s Mainnet. NeoVM is a lightweight and scalable virtual machine for smart-contract development. With its cross-platform compatibility, FLETA will significantly benefit from it.
Once deployed, FLETA and Neo will cooperate on several projects. The first planned one is a blockchain-based Real World Data-based Clinical Research Data Registry Platform for the medical industry. The project aims to activate medical data research and help researchers efficiently use the data.


Wanchain is a cross-chain compatible infrastructure that seeks to connect the world of decentralized finance into one interoperable ecosystem. Different blockchain systems are incompatible with each other, and they operate on their own. The answer to this is creating wrapped tokens of the original assets and incorporating them on the Wanchain platform.
It allows the coins to be used in ways that weren’t possible before. For example, a wrapped Bitcoin token can be used in an Ethereum smart contract to take advantage of the Ethereum blockchain. The token can be easily exchanged back to real Bitcoin by using Wanchain technology.
Wanchain is based on the codebase of Ethereum, but it uses a PoS consensus algorithm. The project has established a partnership with FLETA. With this understanding, both companies expect further to improve interoperability and the performance of their systems.


WINk is a gaming platform offering Live Casino Games, virtual sports, Slots, and E-gaming. WINk was previously known as TronBet, and it is located on the TRON Mainnet.
The platform supports several different tokens: TRX, Dice, USDT, BTT, and of course, WIN token. Besides being a gaming community, WINk also features a staking option. By staking WIN tokens, users get the chance to earn daily staking rewards from the platform’s profits.
WINk plans to integrate with Wallet Street, the social data platform of FLETA. Wallet Street allows stakeholders to communicate and create online communities. The two platforms will start a joint marketing campaign. Wallet Street allows its users to build their own buildings based on the number of coins they own. These structures become visible on a virtual map on Wallet Street. A WINk building will be constructed on Wallet Street’s map to advertise WINk project and its token.


Cooperation is essential for the crypto industry as it opens new possibilities. The sharing of information and knowledge is beneficial to success. Entering new markets allows companies to expand their user base. A broader reach increases use cases for blockchain technology and achieve the ultimate goal: massive adoption. FLETA has realized the importance of strong partnerships, and during 2020, their services will be taken to a whole new stage.
submitted by fleta-official to fletachain [link] [comments]

What's Happening At Dash? | Continually Updated News & Announcements Thread

Welcome to dashpay!
If you are new to Dash, we encourage you to check out our wiki, where the Dash project is explained from the ground up with many links to valuable information resources. Also check out the menu bar on top and the sidebar to the right. We have very active Discord and Telegram channels where the community is happy to answer any and all newcomer questions.

Purpose of this post

This post is directed towards community members who wish to rapidly access information on current developments surrounding the Dash cryptocurrency.
Lately we've noticed how the pace of events picked up significantly within the Dash project due to many years of hard work coming together and pieces falling into place ("Evolution" is finally here. It's called Dash Platform). For the purpose of keeping these many pieces of information together, however, singular Reddit submissions are insufficient. Thus we decided to maintain a pinned thread collecting blog posts, interviews, articles, podcasts, videos & announcements. Check back regularly, as this thread will always feature the latest news around Dash, while also serving as a mid-term archive for important announcements and developments.
Journalists looking for news and contact opportunities wrt Dash, please bookmark:

Dash Press Room

"At Dash Press Room you will find the latest press releases, media materials and product updates on Dash - Digital Cash."

Dash Platform Video Series (formerly known as "Evolution") with Amanda B. Johnson

  1. Dash is Becoming a Cloud | Dash Platform #1
  2. What is Dash Drive? | Dash Platform #2
  3. What is Dash's Decentralized API? (DAPI) | Dash Platform #3
  4. Usernames & Dash Platform Name Service (DPNS) | Dash Platform #4

Dash Core Group News

(last updated: Oct 9th, 2020)

Dash Insights with Mark Mason & Dash Talk with Amanda B. Johnson

(last updated: Oct 9th, 2020)

Development news

(last updated: Oct 9th, 2020)

Adoption, Partnership, Business Development, General News

(last updated: Oct 3rd, 2020)
submitted by Basilpop to dashpay [link] [comments]

How long with the Stellar consolidation last? A forecast from the XLMwallet

How long with the Stellar consolidation last? A forecast from the XLMwallet
It’s been three weeks since the Bitcoin halving, but the rally so many were waiting for didn’t happen, at least for now. Stellar is consolidating and seems to be going up. When can you expect significant gains? As always XLMwallet analytics offer a forecast.
Stellar is still trying to recover from the big hit it took on May 10, together with Bitcoin and the rest. It went from $0.072 to $0.064 — a 12% fall. It scrapped a lot of the gains made in the previous month.

What happened? Why did XLM fall so much? Don’t panic — and definitely don’t sell. If you hold lumens in your XLMwallet, continue to do so. (We hope you do, because XLMwallet is awesome.)
What happened was a banal Bitcoin liquidation. Just before the halving, there was lots of volatility in the market, with people getting excited. The price started rising and even tried to go beyond $10,000. For Bitcoin, it’s been a very strong level or resistance since last summer.
When the price couldn’t cross the $10k mark, it became clear that the ceiling is reached for now. And people started to sell. The price began to fall. Then, a massive liquidation of short positions followed. Those are the futures positions on exchanges like BitMex: a lot of people were shorting BTC. Once some of the positions automatically closed, the price fell a bit further, more positions were liquidated, the price fell again, and so on. It was a chain reaction. Nothing happened to Bitcoin, nothing happened to Stellar. It was all just a technical process.
Stellar, Ethereum and the others simply followed. That’s the unfortunate reality of crypto: all the altcoins follow BTC, like sheep follow a dog. Bitcoin has been struggling to grow back ever since, and so is Stellar. In addition, there are a lot of Bitcoin miners selling the BTC they accumulated in the past few months, creating additional downward pressure.
What should you do? As we’ve said, definitely not sell. It will take Bitcoin a couple of months to get out of its consolidation stage, and then it can start growing properly, tagging the rest of the coins along. We expect very good gains for Stellar starting from July — definitely higher than where it was in early May.
Moreover, the Stellar Foundation has just made another investment. It gave $550,000 to a startup called SatoshiPay. It’s a micropayments product that is now eyeing an expansion into the B2B territory, mostly to let creators of online content get paid across borders.
As we all know, Stellar is the perfect cryptocurrency for cross-border payments: it’s extremely fast and cheap. As we always say, if you can HODL your lumens in the XLMwallet, do so. But if you have to pay with crypto somewhere, do it with Stellar rather than in BTC. Especially now, after the halving, when the BTC transaction fee has risen above $3 — many thousands of times more than with XLM!
In a few words: our advice for XLM owners is hold. A rally is coming, though we’ll have to wait a couple of months for it. We’re pretty sure that the worst for Stellar is over this year, and the only way to go is up.
Website — https://xlmwallet.co/
Medium — https://medium.com/@XLMwalletCo
Teletype — https://teletype.in/@XLMwalletCo
Twitter — https://twitter.com/XLMwalletCo
Reddit — https://www.reddit.com/XLM_wallet/
submitted by Stellar__wallet to XLM_wallet [link] [comments]

Bitcoin (BTC)A Peer-to-Peer Electronic Cash System.

Bitcoin (BTC)A Peer-to-Peer Electronic Cash System.
  • Bitcoin (BTC) is a peer-to-peer cryptocurrency that aims to function as a means of exchange that is independent of any central authority. BTC can be transferred electronically in a secure, verifiable, and immutable way.
  • Launched in 2009, BTC is the first virtual currency to solve the double-spending issue by timestamping transactions before broadcasting them to all of the nodes in the Bitcoin network. The Bitcoin Protocol offered a solution to the Byzantine Generals’ Problem with a blockchain network structure, a notion first created by Stuart Haber and W. Scott Stornetta in 1991.
  • Bitcoin’s whitepaper was published pseudonymously in 2008 by an individual, or a group, with the pseudonym “Satoshi Nakamoto”, whose underlying identity has still not been verified.
  • The Bitcoin protocol uses an SHA-256d-based Proof-of-Work (PoW) algorithm to reach network consensus. Its network has a target block time of 10 minutes and a maximum supply of 21 million tokens, with a decaying token emission rate. To prevent fluctuation of the block time, the network’s block difficulty is re-adjusted through an algorithm based on the past 2016 block times.
  • With a block size limit capped at 1 megabyte, the Bitcoin Protocol has supported both the Lightning Network, a second-layer infrastructure for payment channels, and Segregated Witness, a soft-fork to increase the number of transactions on a block, as solutions to network scalability.


1. What is Bitcoin (BTC)?

  • Bitcoin is a peer-to-peer cryptocurrency that aims to function as a means of exchange and is independent of any central authority. Bitcoins are transferred electronically in a secure, verifiable, and immutable way.
  • Network validators, whom are often referred to as miners, participate in the SHA-256d-based Proof-of-Work consensus mechanism to determine the next global state of the blockchain.
  • The Bitcoin protocol has a target block time of 10 minutes, and a maximum supply of 21 million tokens. The only way new bitcoins can be produced is when a block producer generates a new valid block.
  • The protocol has a token emission rate that halves every 210,000 blocks, or approximately every 4 years.
  • Unlike public blockchain infrastructures supporting the development of decentralized applications (Ethereum), the Bitcoin protocol is primarily used only for payments, and has only very limited support for smart contract-like functionalities (Bitcoin “Script” is mostly used to create certain conditions before bitcoins are used to be spent).

2. Bitcoin’s core features

For a more beginner’s introduction to Bitcoin, please visit Binance Academy’s guide to Bitcoin.

Unspent Transaction Output (UTXO) model

A UTXO transaction works like cash payment between two parties: Alice gives money to Bob and receives change (i.e., unspent amount). In comparison, blockchains like Ethereum rely on the account model.

Nakamoto consensus

In the Bitcoin network, anyone can join the network and become a bookkeeping service provider i.e., a validator. All validators are allowed in the race to become the block producer for the next block, yet only the first to complete a computationally heavy task will win. This feature is called Proof of Work (PoW).
The probability of any single validator to finish the task first is equal to the percentage of the total network computation power, or hash power, the validator has. For instance, a validator with 5% of the total network computation power will have a 5% chance of completing the task first, and therefore becoming the next block producer.
Since anyone can join the race, competition is prone to increase. In the early days, Bitcoin mining was mostly done by personal computer CPUs.
As of today, Bitcoin validators, or miners, have opted for dedicated and more powerful devices such as machines based on Application-Specific Integrated Circuit (“ASIC”).
Proof of Work secures the network as block producers must have spent resources external to the network (i.e., money to pay electricity), and can provide proof to other participants that they did so.
With various miners competing for block rewards, it becomes difficult for one single malicious party to gain network majority (defined as more than 51% of the network’s hash power in the Nakamoto consensus mechanism). The ability to rearrange transactions via 51% attacks indicates another feature of the Nakamoto consensus: the finality of transactions is only probabilistic.
Once a block is produced, it is then propagated by the block producer to all other validators to check on the validity of all transactions in that block. The block producer will receive rewards in the network’s native currency (i.e., bitcoin) as all validators approve the block and update their ledgers.

The blockchain

Block production

The Bitcoin protocol utilizes the Merkle tree data structure in order to organize hashes of numerous individual transactions into each block. This concept is named after Ralph Merkle, who patented it in 1979.
With the use of a Merkle tree, though each block might contain thousands of transactions, it will have the ability to combine all of their hashes and condense them into one, allowing efficient and secure verification of this group of transactions. This single hash called is a Merkle root, which is stored in the Block Header of a block. The Block Header also stores other meta information of a block, such as a hash of the previous Block Header, which enables blocks to be associated in a chain-like structure (hence the name “blockchain”).
An illustration of block production in the Bitcoin Protocol is demonstrated below.


Block time and mining difficulty

Block time is the period required to create the next block in a network. As mentioned above, the node who solves the computationally intensive task will be allowed to produce the next block. Therefore, block time is directly correlated to the amount of time it takes for a node to find a solution to the task. The Bitcoin protocol sets a target block time of 10 minutes, and attempts to achieve this by introducing a variable named mining difficulty.
Mining difficulty refers to how difficult it is for the node to solve the computationally intensive task. If the network sets a high difficulty for the task, while miners have low computational power, which is often referred to as “hashrate”, it would statistically take longer for the nodes to get an answer for the task. If the difficulty is low, but miners have rather strong computational power, statistically, some nodes will be able to solve the task quickly.
Therefore, the 10 minute target block time is achieved by constantly and automatically adjusting the mining difficulty according to how much computational power there is amongst the nodes. The average block time of the network is evaluated after a certain number of blocks, and if it is greater than the expected block time, the difficulty level will decrease; if it is less than the expected block time, the difficulty level will increase.

What are orphan blocks?

In a PoW blockchain network, if the block time is too low, it would increase the likelihood of nodes producingorphan blocks, for which they would receive no reward. Orphan blocks are produced by nodes who solved the task but did not broadcast their results to the whole network the quickest due to network latency.
It takes time for a message to travel through a network, and it is entirely possible for 2 nodes to complete the task and start to broadcast their results to the network at roughly the same time, while one’s messages are received by all other nodes earlier as the node has low latency.
Imagine there is a network latency of 1 minute and a target block time of 2 minutes. A node could solve the task in around 1 minute but his message would take 1 minute to reach the rest of the nodes that are still working on the solution. While his message travels through the network, all the work done by all other nodes during that 1 minute, even if these nodes also complete the task, would go to waste. In this case, 50% of the computational power contributed to the network is wasted.
The percentage of wasted computational power would proportionally decrease if the mining difficulty were higher, as it would statistically take longer for miners to complete the task. In other words, if the mining difficulty, and therefore targeted block time is low, miners with powerful and often centralized mining facilities would get a higher chance of becoming the block producer, while the participation of weaker miners would become in vain. This introduces possible centralization and weakens the overall security of the network.
However, given a limited amount of transactions that can be stored in a block, making the block time too longwould decrease the number of transactions the network can process per second, negatively affecting network scalability.

3. Bitcoin’s additional features

Segregated Witness (SegWit)

Segregated Witness, often abbreviated as SegWit, is a protocol upgrade proposal that went live in August 2017.
SegWit separates witness signatures from transaction-related data. Witness signatures in legacy Bitcoin blocks often take more than 50% of the block size. By removing witness signatures from the transaction block, this protocol upgrade effectively increases the number of transactions that can be stored in a single block, enabling the network to handle more transactions per second. As a result, SegWit increases the scalability of Nakamoto consensus-based blockchain networks like Bitcoin and Litecoin.
SegWit also makes transactions cheaper. Since transaction fees are derived from how much data is being processed by the block producer, the more transactions that can be stored in a 1MB block, the cheaper individual transactions become.
The legacy Bitcoin block has a block size limit of 1 megabyte, and any change on the block size would require a network hard-fork. On August 1st 2017, the first hard-fork occurred, leading to the creation of Bitcoin Cash (“BCH”), which introduced an 8 megabyte block size limit.
Conversely, Segregated Witness was a soft-fork: it never changed the transaction block size limit of the network. Instead, it added an extended block with an upper limit of 3 megabytes, which contains solely witness signatures, to the 1 megabyte block that contains only transaction data. This new block type can be processed even by nodes that have not completed the SegWit protocol upgrade.
Furthermore, the separation of witness signatures from transaction data solves the malleability issue with the original Bitcoin protocol. Without Segregated Witness, these signatures could be altered before the block is validated by miners. Indeed, alterations can be done in such a way that if the system does a mathematical check, the signature would still be valid. However, since the values in the signature are changed, the two signatures would create vastly different hash values.
For instance, if a witness signature states “6,” it has a mathematical value of 6, and would create a hash value of 12345. However, if the witness signature were changed to “06”, it would maintain a mathematical value of 6 while creating a (faulty) hash value of 67890.
Since the mathematical values are the same, the altered signature remains a valid signature. This would create a bookkeeping issue, as transactions in Nakamoto consensus-based blockchain networks are documented with these hash values, or transaction IDs. Effectively, one can alter a transaction ID to a new one, and the new ID can still be valid.
This can create many issues, as illustrated in the below example:
  1. Alice sends Bob 1 BTC, and Bob sends Merchant Carol this 1 BTC for some goods.
  2. Bob sends Carols this 1 BTC, while the transaction from Alice to Bob is not yet validated. Carol sees this incoming transaction of 1 BTC to him, and immediately ships goods to B.
  3. At the moment, the transaction from Alice to Bob is still not confirmed by the network, and Bob can change the witness signature, therefore changing this transaction ID from 12345 to 67890.
  4. Now Carol will not receive his 1 BTC, as the network looks for transaction 12345 to ensure that Bob’s wallet balance is valid.
  5. As this particular transaction ID changed from 12345 to 67890, the transaction from Bob to Carol will fail, and Bob will get his goods while still holding his BTC.
With the Segregated Witness upgrade, such instances can not happen again. This is because the witness signatures are moved outside of the transaction block into an extended block, and altering the witness signature won’t affect the transaction ID.
Since the transaction malleability issue is fixed, Segregated Witness also enables the proper functioning of second-layer scalability solutions on the Bitcoin protocol, such as the Lightning Network.

Lightning Network

Lightning Network is a second-layer micropayment solution for scalability.
Specifically, Lightning Network aims to enable near-instant and low-cost payments between merchants and customers that wish to use bitcoins.
Lightning Network was conceptualized in a whitepaper by Joseph Poon and Thaddeus Dryja in 2015. Since then, it has been implemented by multiple companies. The most prominent of them include Blockstream, Lightning Labs, and ACINQ.
A list of curated resources relevant to Lightning Network can be found here.
In the Lightning Network, if a customer wishes to transact with a merchant, both of them need to open a payment channel, which operates off the Bitcoin blockchain (i.e., off-chain vs. on-chain). None of the transaction details from this payment channel are recorded on the blockchain, and only when the channel is closed will the end result of both party’s wallet balances be updated to the blockchain. The blockchain only serves as a settlement layer for Lightning transactions.
Since all transactions done via the payment channel are conducted independently of the Nakamoto consensus, both parties involved in transactions do not need to wait for network confirmation on transactions. Instead, transacting parties would pay transaction fees to Bitcoin miners only when they decide to close the channel.
One limitation to the Lightning Network is that it requires a person to be online to receive transactions attributing towards him. Another limitation in user experience could be that one needs to lock up some funds every time he wishes to open a payment channel, and is only able to use that fund within the channel.
However, this does not mean he needs to create new channels every time he wishes to transact with a different person on the Lightning Network. If Alice wants to send money to Carol, but they do not have a payment channel open, they can ask Bob, who has payment channels open to both Alice and Carol, to help make that transaction. Alice will be able to send funds to Bob, and Bob to Carol. Hence, the number of “payment hubs” (i.e., Bob in the previous example) correlates with both the convenience and the usability of the Lightning Network for real-world applications.

Schnorr Signature upgrade proposal

Elliptic Curve Digital Signature Algorithm (“ECDSA”) signatures are used to sign transactions on the Bitcoin blockchain.
However, many developers now advocate for replacing ECDSA with Schnorr Signature. Once Schnorr Signatures are implemented, multiple parties can collaborate in producing a signature that is valid for the sum of their public keys.
This would primarily be beneficial for network scalability. When multiple addresses were to conduct transactions to a single address, each transaction would require their own signature. With Schnorr Signature, all these signatures would be combined into one. As a result, the network would be able to store more transactions in a single block.
The reduced size in signatures implies a reduced cost on transaction fees. The group of senders can split the transaction fees for that one group signature, instead of paying for one personal signature individually.
Schnorr Signature also improves network privacy and token fungibility. A third-party observer will not be able to detect if a user is sending a multi-signature transaction, since the signature will be in the same format as a single-signature transaction.

4. Economics and supply distribution

The Bitcoin protocol utilizes the Nakamoto consensus, and nodes validate blocks via Proof-of-Work mining. The bitcoin token was not pre-mined, and has a maximum supply of 21 million. The initial reward for a block was 50 BTC per block. Block mining rewards halve every 210,000 blocks. Since the average time for block production on the blockchain is 10 minutes, it implies that the block reward halving events will approximately take place every 4 years.
As of May 12th 2020, the block mining rewards are 6.25 BTC per block. Transaction fees also represent a minor revenue stream for miners.
submitted by D-platform to u/D-platform [link] [comments]

Fun Fact: The infamous 10,000 btc pizzas bought in 2010 are now worth $11,770,000.

submitted by FargoBTC to Bitcoin [link] [comments]

Nano vs. Dogecoin - a tale of two cryptocurrency for microtransactions (& more)

So, I wanted to write here, because I think Nano community is open-minded, and can think it through - I really like it, and tho I don't have it (only tested it a few times from faucets).

As I see both of those CCs are focusing mainly on low-cost payments and microtransaction/micropayments, and "fun to use".
Even tho Dogecoin can be though as "meme" and "silly", it's actually used and adopted in many places - far more then Nano (ofc, it's also older and have easier codebase to implement - sharing it with bitcoin), but as I will outline, I think that there are a few things that Nano/Nano community can learn from them.


Now Nano:

Liquidity comparison:
Nano: https://coinpaprika.com/coin/nano-nano/#!liquidity
Doge: https://coinpaprika.com/coin/doge-dogecoin/#!liquidity
The trend is evident, if you switch to 1y or max on market depth history - Dogecoin have almost +100% growth in this period (from June 2019) and Nano 50% decline.
Looking at the data from vcdepth it's even more apparent:

As I say, I think Nano can learn from Doge's some, especially regarding exchange's liquidity - that's preventing a lot from happening right now. Binance is the only source, and market maker for Nano, but there should be more - through the ecosystem.
What Nano team should do in my opinion is: take part of their funds from dev premine, and use it for liquidity purposes. Cryptocurrencies can't be "run" like startups, and Nano holding shouldn't be treated as equity or cash equivalent, dumping it straight on the books. Binance is making a lot to provide all of their coins with liquid markets (their MMs are one of the best on the market), but I think team can increase liquidity easily by a factor of 2-3x, just by hiring specialistic company, that will manage it. I know coins, that have done it - and it's the main thing that helped them stay relevant. Developing protocol is important, but without liquid market - it doesn't achieve anything (because it won't be used by more people). Especially I would try to improve USDT markets - they are basically USD pairs.

PS. I'm not a developer, but I research CCs on daily basis, because it's actually my work. I think my comparison is right, because Doge have achieve much more then being only "meme" currency, and Banano did not (it's only meme currency without liquidity, acceptance, or being really used anywhere).
submitted by muf18 to nanocurrency [link] [comments]

Technical: A Brief History of Payment Channels: from Satoshi to Lightning Network

Who cares about political tweets from some random country's president when payment channels are a much more interesting and are actually capable of carrying value?
So let's have a short history of various payment channel techs!

Generation 0: Satoshi's Broken nSequence Channels

Because Satoshi's Vision included payment channels, except his implementation sucked so hard we had to go fix it and added RBF as a by-product.
Originally, the plan for nSequence was that mempools would replace any transaction spending certain inputs with another transaction spending the same inputs, but only if the nSequence field of the replacement was larger.
Since 0xFFFFFFFF was the highest value that nSequence could get, this would mark a transaction as "final" and not replaceable on the mempool anymore.
In fact, this "nSequence channel" I will describe is the reason why we have this weird rule about nLockTime and nSequence. nLockTime actually only works if nSequence is not 0xFFFFFFFF i.e. final. If nSequence is 0xFFFFFFFF then nLockTime is ignored, because this if the "final" version of the transaction.
So what you'd do would be something like this:
  1. You go to a bar and promise the bartender to pay by the time the bar closes. Because this is the Bitcoin universe, time is measured in blockheight, so the closing time of the bar is indicated as some future blockheight.
  2. For your first drink, you'd make a transaction paying to the bartender for that drink, paying from some coins you have. The transaction has an nLockTime equal to the closing time of the bar, and a starting nSequence of 0. You hand over the transaction and the bartender hands you your drink.
  3. For your succeeding drink, you'd remake the same transaction, adding the payment for that drink to the transaction output that goes to the bartender (so that output keeps getting larger, by the amount of payment), and having an nSequence that is one higher than the previous one.
  4. Eventually you have to stop drinking. It comes down to one of two possibilities:
    • You drink until the bar closes. Since it is now the nLockTime indicated in the transaction, the bartender is able to broadcast the latest transaction and tells the bouncers to kick you out of the bar.
    • You wisely consider the state of your liver. So you re-sign the last transaction with a "final" nSequence of 0xFFFFFFFF i.e. the maximum possible value it can have. This allows the bartender to get his or her funds immediately (nLockTime is ignored if nSequence is 0xFFFFFFFF), so he or she tells the bouncers to let you out of the bar.
Now that of course is a payment channel. Individual payments (purchases of alcohol, so I guess buying coffee is not in scope for payment channels). Closing is done by creating a "final" transaction that is the sum of the individual payments. Sure there's no routing and channels are unidirectional and channels have a maximum lifetime but give Satoshi a break, he was also busy inventing Bitcoin at the time.
Now if you noticed I called this kind of payment channel "broken". This is because the mempool rules are not consensus rules, and cannot be validated (nothing about the mempool can be validated onchain: I sigh every time somebody proposes "let's make block size dependent on mempool size", mempool state cannot be validated by onchain data). Fullnodes can't see all of the transactions you signed, and then validate that the final one with the maximum nSequence is the one that actually is used onchain. So you can do the below:
  1. Become friends with Jihan Wu, because he owns >51% of the mining hashrate (he totally reorged Bitcoin to reverse the Binance hack right?).
  2. Slip Jihan Wu some of the more interesting drinks you're ordering as an incentive to cooperate with you. So say you end up ordering 100 drinks, you split it with Jihan Wu and give him 50 of the drinks.
  3. When the bar closes, Jihan Wu quickly calls his mining rig and tells them to mine the version of your transaction with nSequence 0. You know, that first one where you pay for only one drink.
  4. Because fullnodes cannot validate nSequence, they'll accept even the nSequence=0 version and confirm it, immutably adding you paying for a single alcoholic drink to the blockchain.
  5. The bartender, pissed at being cheated, takes out a shotgun from under the bar and shoots at you and Jihan Wu.
  6. Jihan Wu uses his mystical chi powers (actually the combined exhaust from all of his mining rigs) to slow down the shotgun pellets, making them hit you as softly as petals drifting in the wind.
  7. The bartender mutters some words, clothes ripping apart as he or she (hard to believe it could be a she but hey) turns into a bear, ready to maul you for cheating him or her of the payment for all the 100 drinks you ordered from him or her.
  8. Steely-eyed, you stand in front of the bartender-turned-bear, daring him to touch you. You've watched Revenant, you know Leonardo di Caprio could survive a bear mauling, and if some posh actor can survive that, you know you can too. You make a pose. "Drunken troll logic attack!"
  9. I think I got sidetracked here.
Lessons learned?

Spilman Channels

Incentive-compatible time-limited unidirectional channel; or, Satoshi's Vision, Fixed (if transaction malleability hadn't been a problem, that is).
Now, we know the bartender will turn into a bear and maul you if you try to cheat the payment channel, and now that we've revealed you're good friends with Jihan Wu, the bartender will no longer accept a payment channel scheme that lets one you cooperate with a miner to cheat the bartender.
Fortunately, Jeremy Spilman proposed a better way that would not let you cheat the bartender.
First, you and the bartender perform this ritual:
  1. You get some funds and create a transaction that pays to a 2-of-2 multisig between you and the bartender. You don't broadcast this yet: you just sign it and get its txid.
  2. You create another transaction that spends the above transaction. This transaction (the "backoff") has an nLockTime equal to the closing time of the bar, plus one block. You sign it and give this backoff transaction (but not the above transaction) to the bartender.
  3. The bartender signs the backoff and gives it back to you. It is now valid since it's spending a 2-of-2 of you and the bartender, and both of you have signed the backoff transaction.
  4. Now you broadcast the first transaction onchain. You and the bartender wait for it to be deeply confirmed, then you can start ordering.
The above is probably vaguely familiar to LN users. It's the funding process of payment channels! The first transaction, the one that pays to a 2-of-2 multisig, is the funding transaction that backs the payment channel funds.
So now you start ordering in this way:
  1. For your first drink, you create a transaction spending the funding transaction output and sending the price of the drink to the bartender, with the rest returning to you.
  2. You sign the transaction and pass it to the bartender, who serves your first drink.
  3. For your succeeding drinks, you recreate the same transaction, adding the price of the new drink to the sum that goes to the bartender and reducing the money returned to you. You sign the transaction and give it to the bartender, who serves you your next drink.
  4. At the end:
    • If the bar closing time is reached, the bartender signs the latest transaction, completing the needed 2-of-2 signatures and broadcasting this to the Bitcoin network. Since the backoff transaction is the closing time + 1, it can't get used at closing time.
    • If you decide you want to leave early because your liver is crying, you just tell the bartender to go ahead and close the channel (which the bartender can do at any time by just signing and broadcasting the latest transaction: the bartender won't do that because he or she is hoping you'll stay and drink more).
    • If you ended up just hanging around the bar and never ordering, then at closing time + 1 you broadcast the backoff transaction and get your funds back in full.
Now, even if you pass 50 drinks to Jihan Wu, you can't give him the first transaction (the one which pays for only one drink) and ask him to mine it: it's spending a 2-of-2 and the copy you have only contains your own signature. You need the bartender's signature to make it valid, but he or she sure as hell isn't going to cooperate in something that would lose him or her money, so a signature from the bartender validating old state where he or she gets paid less isn't going to happen.
So, problem solved, right? Right? Okay, let's try it. So you get your funds, put them in a funding tx, get the backoff tx, confirm the funding tx...
Once the funding transaction confirms deeply, the bartender laughs uproariously. He or she summons the bouncers, who surround you menacingly.
"I'm refusing service to you," the bartender says.
"Fine," you say. "I was leaving anyway;" You smirk. "I'll get back my money with the backoff transaction, and posting about your poor service on reddit so you get negative karma, so there!"
"Not so fast," the bartender says. His or her voice chills your bones. It looks like your exploitation of the Satoshi nSequence payment channel is still fresh in his or her mind. "Look at the txid of the funding transaction that got confirmed."
"What about it?" you ask nonchalantly, as you flip open your desktop computer and open a reputable blockchain explorer.
What you see shocks you.
"What the --- the txid is different! You--- you changed my signature?? But how? I put the only copy of my private key in a sealed envelope in a cast-iron box inside a safe buried in the Gobi desert protected by a clan of nomads who have dedicated their lives and their childrens' lives to keeping my private key safe in perpetuity!"
"Didn't you know?" the bartender asks. "The components of the signature are just very large numbers. The sign of one of the signature components can be changed, from positive to negative, or negative to positive, and the signature will remain valid. Anyone can do that, even if they don't know the private key. But because Bitcoin includes the signatures in the transaction when it's generating the txid, this little change also changes the txid." He or she chuckles. "They say they'll fix it by separating the signatures from the transaction body. They're saying that these kinds of signature malleability won't affect transaction ids anymore after they do this, but I bet I can get my good friend Jihan Wu to delay this 'SepSig' plan for a good while yet. Friendly guy, this Jihan Wu, it turns out all I had to do was slip him 51 drinks and he was willing to mine a tx with the signature signs flipped." His or her grin widens. "I'm afraid your backoff transaction won't work anymore, since it spends a txid that is not existent and will never be confirmed. So here's the deal. You pay me 99% of the funds in the funding transaction, in exchange for me signing the transaction that spends with the txid that you see onchain. Refuse, and you lose 100% of the funds and every other HODLer, including me, benefits from the reduction in coin supply. Accept, and you get to keep 1%. I lose nothing if you refuse, so I won't care if you do, but consider the difference of getting zilch vs. getting 1% of your funds." His or her eyes glow. "GENUFLECT RIGHT NOW."
Lesson learned?

CLTV-protected Spilman Channels

Using CLTV for the backoff branch.
This variation is simply Spilman channels, but with the backoff transaction replaced with a backoff branch in the SCRIPT you pay to. It only became possible after OP_CHECKLOCKTIMEVERIFY (CLTV) was enabled in 2015.
Now as we saw in the Spilman Channels discussion, transaction malleability means that any pre-signed offchain transaction can easily be invalidated by flipping the sign of the signature of the funding transaction while the funding transaction is not yet confirmed.
This can be avoided by simply putting any special requirements into an explicit branch of the Bitcoin SCRIPT. Now, the backoff branch is supposed to create a maximum lifetime for the payment channel, and prior to the introduction of OP_CHECKLOCKTIMEVERIFY this could only be done by having a pre-signed nLockTime transaction.
With CLTV, however, we can now make the branches explicit in the SCRIPT that the funding transaction pays to.
Instead of paying to a 2-of-2 in order to set up the funding transaction, you pay to a SCRIPT which is basically "2-of-2, OR this singlesig after a specified lock time".
With this, there is no backoff transaction that is pre-signed and which refers to a specific txid. Instead, you can create the backoff transaction later, using whatever txid the funding transaction ends up being confirmed under. Since the funding transaction is immutable once confirmed, it is no longer possible to change the txid afterwards.

Todd Micropayment Networks

The old hub-spoke model (that isn't how LN today actually works).
One of the more direct predecessors of the Lightning Network was the hub-spoke model discussed by Peter Todd. In this model, instead of payers directly having channels to payees, payers and payees connect to a central hub server. This allows any payer to pay any payee, using the same channel for every payee on the hub. Similarly, this allows any payee to receive from any payer, using the same channel.
Remember from the above Spilman example? When you open a channel to the bartender, you have to wait around for the funding tx to confirm. This will take an hour at best. Now consider that you have to make channels for everyone you want to pay to. That's not very scalable.
So the Todd hub-spoke model has a central "clearing house" that transport money from payers to payees. The "Moonbeam" project takes this model. Of course, this reveals to the hub who the payer and payee are, and thus the hub can potentially censor transactions. Generally, though, it was considered that a hub would more efficiently censor by just not maintaining a channel with the payer or payee that it wants to censor (since the money it owned in the channel would just be locked uselessly if the hub won't process payments to/from the censored user).
In any case, the ability of the central hub to monitor payments means that it can surveill the payer and payee, and then sell this private transactional data to third parties. This loss of privacy would be intolerable today.
Peter Todd also proposed that there might be multiple hubs that could transport funds to each other on behalf of their users, providing somewhat better privacy.
Another point of note is that at the time such networks were proposed, only unidirectional (Spilman) channels were available. Thus, while one could be a payer, or payee, you would have to use separate channels for your income versus for your spending. Worse, if you wanted to transfer money from your income channel to your spending channel, you had to close both and reshuffle the money between them, both onchain activities.

Poon-Dryja Lightning Network

Bidirectional two-participant channels.
The Poon-Dryja channel mechanism has two important properties:
Both the original Satoshi and the two Spilman variants are unidirectional: there is a payer and a payee, and if the payee wants to do a refund, or wants to pay for a different service or product the payer is providing, then they can't use the same unidirectional channel.
The Poon-Dryjam mechanism allows channels, however, to be bidirectional instead: you are not a payer or a payee on the channel, you can receive or send at any time as long as both you and the channel counterparty are online.
Further, unlike either of the Spilman variants, there is no time limit for the lifetime of a channel. Instead, you can keep the channel open for as long as you want.
Both properties, together, form a very powerful scaling property that I believe most people have not appreciated. With unidirectional channels, as mentioned before, if you both earn and spend over the same network of payment channels, you would have separate channels for earning and spending. You would then need to perform onchain operations to "reverse" the directions of your channels periodically. Secondly, since Spilman channels have a fixed lifetime, even if you never used either channel, you would have to periodically "refresh" it by closing it and reopening.
With bidirectional, indefinite-lifetime channels, you may instead open some channels when you first begin managing your own money, then close them only after your lawyers have executed your last will and testament on how the money in your channels get divided up to your heirs: that's just two onchain transactions in your entire lifetime. That is the potentially very powerful scaling property that bidirectional, indefinite-lifetime channels allow.
I won't discuss the transaction structure needed for Poon-Dryja bidirectional channels --- it's complicated and you can easily get explanations with cute graphics elsewhere.
There is a weakness of Poon-Dryja that people tend to gloss over (because it was fixed very well by RustyReddit):
Another thing I want to emphasize is that while the Lightning Network paper and many of the earlier presentations developed from the old Peter Todd hub-and-spoke model, the modern Lightning Network takes the logical conclusion of removing a strict separation between "hubs" and "spokes". Any node on the Lightning Network can very well work as a hub for any other node. Thus, while you might operate as "mostly a payer", "mostly a forwarding node", "mostly a payee", you still end up being at least partially a forwarding node ("hub") on the network, at least part of the time. This greatly reduces the problems of privacy inherent in having only a few hub nodes: forwarding nodes cannot get significantly useful data from the payments passing through them, because the distance between the payer and the payee can be so large that it would be likely that the ultimate payer and the ultimate payee could be anyone on the Lightning Network.
Lessons learned?


After LN, there's also the Decker-Wattenhofer Duplex Micropayment Channels (DMC). This post is long enough as-is, LOL. But for now, it uses a novel "decrementing nSequence channel", using the new relative-timelock semantics of nSequence (not the broken one originally by Satoshi). It actually uses multiple such "decrementing nSequence" constructs, terminating in a pair of Spilman channels, one in both directions (thus "duplex"). Maybe I'll discuss it some other time.
The realization that channel constructions could actually hold more channel constructions inside them (the way the Decker-Wattenhofer puts a pair of Spilman channels inside a series of "decrementing nSequence channels") lead to the further thought behind Burchert-Decker-Wattenhofer channel factories. Basically, you could host multiple two-participant channel constructs inside a larger multiparticipant "channel" construct (i.e. host multiple channels inside a factory).
Further, we have the Decker-Russell-Osuntokun or "eltoo" construction. I'd argue that this is "nSequence done right". I'll write more about this later, because this post is long enough.
Lessons learned?
submitted by almkglor to Bitcoin [link] [comments]

Bitcoin Micropayments TheProtocolTV - YouTube Bitcoin micropayments for proxies — Princeton Bitcoin seminar final project #974 DeFi Token Sets, MicroStrategy kauft mehr Bitcoin ... Bitcoin Predictions by Majority!

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