Syscoin Platform’s Great Reddit Scaling Bake-off Proposal

Syscoin Platform’s Great Reddit Scaling Bake-off Proposal
We are excited to participate and present Syscoin Platform's ideal characteristics and capabilities towards a well-rounded Reddit Community Points solution!
Our scaling solution for Reddit Community Points involves 2-way peg interoperability with Ethereum. This will provide a scalable token layer built specifically for speed and high volumes of simple value transfers at a very low cost, while providing sovereign ownership and onchain finality.
Token transfers scale by taking advantage of a globally sorting mempool that provides for probabilistically secure assumptions of “as good as settled”. The opportunity here for token receivers is to have an app-layer interactivity on the speed/security tradeoff (99.9999% assurance within 10 seconds). We call this Z-DAG, and it achieves high-throughput across a mesh network topology presently composed of about 2,000 geographically dispersed full-nodes. Similar to Bitcoin, however, these nodes are incentivized to run full-nodes for the benefit of network security, through a bonded validator scheme. These nodes do not participate in the consensus of transactions or block validation any differently than other nodes and therefore do not degrade the security model of Bitcoin’s validate first then trust, across every node. Each token transfer settles on-chain. The protocol follows Bitcoin core policies so it has adequate code coverage and protocol hardening to be qualified as production quality software. It shares a significant portion of Bitcoin’s own hashpower through merged-mining.
This platform as a whole can serve token microtransactions, larger settlements, and store-of-value in an ideal fashion, providing probabilistic scalability whilst remaining decentralized according to Bitcoin design. It is accessible to ERC-20 via a permissionless and trust-minimized bridge that works in both directions. The bridge and token platform are currently available on the Syscoin mainnet. This has been gaining recent attention for use by loyalty point programs and stablecoins such as Binance USD.


Syscoin Foundation identified a few paths for Reddit to leverage this infrastructure, each with trade-offs. The first provides the most cost-savings and scaling benefits at some sacrifice of token autonomy. The second offers more preservation of autonomy with a more narrow scope of cost savings than the first option, but savings even so. The third introduces more complexity than the previous two yet provides the most overall benefits. We consider the third as most viable as it enables Reddit to benefit even while retaining existing smart contract functionality. We will focus on the third option, and include the first two for good measure.
  1. Distribution, burns and user-to-user transfers of Reddit Points are entirely carried out on the Syscoin network. This full-on approach to utilizing the Syscoin network provides the most scalability and transaction cost benefits of these scenarios. The tradeoff here is distribution and subscription handling likely migrating away from smart contracts into the application layer.
  2. The Reddit Community Points ecosystem can continue to use existing smart contracts as they are used today on the Ethereum mainchain. Users migrate a portion of their tokens to Syscoin, the scaling network, to gain much lower fees, scalability, and a proven base layer, without sacrificing sovereign ownership. They would use Syscoin for user-to-user transfers. Tips redeemable in ten seconds or less, a high-throughput relay network, and onchain settlement at a block target of 60 seconds.
  3. Integration between Matic Network and Syscoin Platform - similar to Syscoin’s current integration with Ethereum - will provide Reddit Community Points with EVM scalability (including the Memberships ERC777 operator) on the Matic side, and performant simple value transfers, robust decentralized security, and sovereign store-of-value on the Syscoin side. It’s “the best of both worlds”. The trade-off is more complex interoperability.

Syscoin + Matic Integration

Matic and Blockchain Foundry Inc, the public company formed by the founders of Syscoin, recently entered a partnership for joint research and business development initiatives. This is ideal for all parties as Matic Network and Syscoin Platform provide complementary utility. Syscoin offers characteristics for sovereign ownership and security based on Bitcoin’s time-tested model, and shares a significant portion of Bitcoin’s own hashpower. Syscoin’s focus is on secure and scalable simple value transfers, trust-minimized interoperability, and opt-in regulatory compliance for tokenized assets rather than scalability for smart contract execution. On the other hand, Matic Network can provide scalable EVM for smart contract execution. Reddit Community Points can benefit from both.
Syscoin + Matic integration is actively being explored by both teams, as it is helpful to Reddit, Ethereum, and the industry as a whole.

Proving Performance & Cost Savings

Our POC focuses on 100,000 on-chain settlements of token transfers on the Syscoin Core blockchain. Transfers and burns perform equally with Syscoin. For POCs related to smart contracts (subscriptions, etc), refer to the Matic Network proposal.
On-chain settlement of 100k transactions was accomplished within roughly twelve minutes, well-exceeding Reddit’s expectation of five days. This was performed using six full-nodes operating on compute-optimized AWS c4.2xlarge instances which were geographically distributed (Virginia, London, Sao Paulo Brazil, Oregon, Singapore, Germany). A higher quantity of settlements could be reached within the same time-frame with more broadcasting nodes involved, or using hosts with more resources for faster execution of the process.
Addresses used: 100,014
The demonstration was executed using this tool. The results can be seen in the following blocks:
It is important to note that this POC is not focused on Z-DAG. The performance of Z-DAG has been benchmarked within realistic network conditions: Whiteblock’s audit is publicly available. Network latency tests showed an average TPS around 15k with burst capacity up to 61k. Zero-latency control group exhibited ~150k TPS. Mainnet testing of the Z-DAG network is achievable and will require further coordination and additional resources.
Even further optimizations are expected in the upcoming Syscoin Core release which will implement a UTXO model for our token layer bringing further efficiency as well as open the door to additional scaling technology currently under research by our team and academic partners. At present our token layer is account-based, similar to Ethereum. Opt-in compliance structures will also be introduced soon which will offer some positive performance characteristics as well. It makes the most sense to implement these optimizations before performing another benchmark for Z-DAG, especially on the mainnet considering the resources required to stress-test this network.

Cost Savings

Total cost for these 100k transactions: $0.63 USD
See the live fee comparison for savings estimation between transactions on Ethereum and Syscoin. Below is a snapshot at time of writing:
ETH price: $318.55 ETH gas price: 55.00 Gwei ($0.37)
Syscoin price: $0.11
Snapshot of live fee comparison chart
Z-DAG provides a more efficient fee-market. A typical Z-DAG transaction costs 0.0000582 SYS. Tokens can be safely redeemed/re-spent within seconds or allowed to settle on-chain beforehand. The costs should remain about this low for microtransactions.
Syscoin will achieve further reduction of fees and even greater scalability with offchain payment channels for assets, with Z-DAG as a resilience fallback. New payment channel technology is one of the topics under research by the Syscoin development team with our academic partners at TU Delft. In line with the calculation in the Lightning Networks white paper, payment channels using assets with Syscoin Core will bring theoretical capacity for each person on Earth (7.8 billion) to have five on-chain transactions per year, per person, without requiring anyone to enter a fee market (aka “wait for a block”). This exceeds the minimum LN expectation of two transactions per person, per year; one to exist on-chain and one to settle aggregated value.

Tools, Infrastructure & Documentation

Syscoin Bridge

Mainnet Demonstration of Syscoin Bridge with the Basic Attention Token ERC-20
A two-way blockchain interoperability system that uses Simple Payment Verification to enable:
  • Any Standard ERC-20 token to be moved from Ethereum to the Syscoin blockchain as a Syscoin Platform Token (SPT), and back to Ethereum
  • Any SPT to be moved from Syscoin to the Ethereum blockchain as an ERC-20 token, and back to Syscoin


  • Permissionless
  • No counterparties involved
  • No trading mechanisms involved
  • No third-party liquidity providers required
  • Cross-chain Fractional Supply - 2-way peg - Token supply maintained globally
  • ERC-20s gain vastly improved transactionality with the Syscoin Token Platform, along with the security of bitcoin-core-compliant PoW.
  • SPTs gain access to all the tooling, applications and capabilities of Ethereum for ERC-20, including smart contracts.

Source code
Main Subprojects


Tools to simplify using Syscoin Bridge as a service with dapps and wallets will be released some time after implementation of Syscoin Core 4.2. These will be based upon the same processes which are automated in the current live Sysethereum Dapp that is functioning with the Syscoin mainnet.


Syscoin Bridge & How it Works (description and process flow)
Superblock Validation Battles
HOWTO: Provision the Bridge for your ERC-20
HOWTO: Setup an Agent
Developer & User Diligence


The Syscoin Ethereum Bridge is secured by Agent nodes participating in a decentralized and incentivized model that involves roles of Superblock challengers and submitters. This model is open to participation. The benefits here are trust-minimization, permissionless-ness, and potentially less legal/regulatory red-tape than interop mechanisms that involve liquidity providers and/or trading mechanisms.
The trade-off is that due to the decentralized nature there are cross-chain settlement times of one hour to cross from Ethereum to Syscoin, and three hours to cross from Syscoin to Ethereum. We are exploring ways to reduce this time while maintaining decentralization via zkp. Even so, an “instant bridge” experience could be provided by means of a third-party liquidity mechanism. That option exists but is not required for bridge functionality today. Typically bridges are used with batch value, not with high frequencies of smaller values, and generally it is advantageous to keep some value on both chains for maximum availability of utility. Even so, the cross-chain settlement time is good to mention here.


Ethereum -> Syscoin: Matic or Ethereum transaction fee for bridge contract interaction, negligible Syscoin transaction fee for minting tokens
Syscoin -> Ethereum: Negligible Syscoin transaction fee for burning tokens, 0.01% transaction fee paid to Bridge Agent in the form of the ERC-20, Matic or Ethereum transaction fee for contract interaction.


Zero-Confirmation Directed Acyclic Graph is an instant settlement protocol that is used as a complementary system to proof-of-work (PoW) in the confirmation of Syscoin service transactions. In essence, a Z-DAG is simply a directed acyclic graph (DAG) where validating nodes verify the sequential ordering of transactions that are received in their memory pools. Z-DAG is used by the validating nodes across the network to ensure that there is absolute consensus on the ordering of transactions and no balances are overflowed (no double-spends).


  • Unique fee-market that is more efficient for microtransaction redemption and settlement
  • Uses decentralized means to enable tokens with value transfer scalability that is comparable or exceeds that of credit card networks
  • Provides high throughput and secure fulfillment even if blocks are full
  • Probabilistic and interactive
  • 99.9999% security assurance within 10 seconds
  • Can serve payment channels as a resilience fallback that is faster and lower-cost than falling-back directly to a blockchain
  • Each Z-DAG transaction also settles onchain through Syscoin Core at 60-second block target using SHA-256 Proof of Work consensus

Source code


Syscoin-js provides tooling for all Syscoin Core RPCs including interactivity with Z-DAG.


Z-DAG White Paper
Useful read: An in-depth Z-DAG discussion between Syscoin Core developer Jag Sidhu and Brave Software Research Engineer Gonçalo Pestana


Z-DAG enables the ideal speed/security tradeoff to be determined per use-case in the application layer. It minimizes the sacrifice required to accept and redeem fast transfers/payments while providing more-than-ample security for microtransactions. This is supported on the premise that a Reddit user receiving points does need security yet generally doesn’t want nor need to wait for the same level of security as a nation-state settling an international trade debt. In any case, each Z-DAG transaction settles onchain at a block target of 60 seconds.

Syscoin Specs

Syscoin 3.0 White Paper
(4.0 white paper is pending. For improved scalability and less blockchain bloat, some features of v3 no longer exist in current v4: Specifically Marketplace Offers, Aliases, Escrow, Certificates, Pruning, Encrypted Messaging)
  • 16MB block bandwidth per minute assuming segwit witness carrying transactions, and transactions ~200 bytes on average
  • SHA256 merge mined with Bitcoin
  • UTXO asset layer, with base Syscoin layer sharing identical security policies as Bitcoin Core
  • Z-DAG on asset layer, bridge to Ethereum on asset layer
  • On-chain scaling with prospect of enabling enterprise grade reliable trustless payment processing with on/offchain hybrid solution
  • Focus only on Simple Value Transfers. MVP of blockchain consensus footprint is balances and ownership of them. Everything else can reduce data availability in exchange for scale (Ethereum 2.0 model). We leave that to other designs, we focus on transfers.
  • Future integrations of MAST/Taproot to get more complex value transfers without trading off trustlessness or decentralization.
  • Zero-knowledge Proofs are a cryptographic new frontier. We are dabbling here to generalize the concept of bridging and also verify the state of a chain efficiently. We also apply it in our Digital Identity projects at Blockchain Foundry (a publicly traded company which develops Syscoin softwares for clients). We are also looking to integrate privacy preserving payment channels for off-chain payments through zkSNARK hub & spoke design which does not suffer from the HTLC attack vectors evident on LN. Much of the issues plaguing Lightning Network can be resolved using a zkSNARK design whilst also providing the ability to do a multi-asset payment channel system. Currently we found a showstopper attack (American Call Option) on LN if we were to use multiple-assets. This would not exist in a system such as this.


Web3 and mobile wallets are under active development by Blockchain Foundry Inc as WebAssembly applications and expected for release not long after mainnet deployment of Syscoin Core 4.2. Both of these will be multi-coin wallets that support Syscoin, SPTs, Ethereum, and ERC-20 tokens. The Web3 wallet will provide functionality similar to Metamask.
Syscoin Platform and tokens are already integrated with Blockbook. Custom hardware wallet support currently exists via ElectrumSys. First-class HW wallet integration through apps such as Ledger Live will exist after 4.2.
Current supported wallets
Syscoin Spark Desktop


Mainnet: (Blockbook)

Thank you for close consideration of our proposal. We look forward to feedback, and to working with the Reddit community to implement an ideal solution using Syscoin Platform!

submitted by sidhujag to ethereum [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]

The BCN pump and ZEC

A couple weeks back I decided to look into investment opportunities on coins still using the original cryptonight algo. The thought being, all those X3s are mining something other than monero - so what?
My criteria were, cryptonight algo and traded on polo. The list was short, exactly one coin - Bytecoin. The diff had risen 8x over the past month and the price had not risen proportionally, this made the decision easy. Bought a not- insignificant quantity of them around 60 sats and expected to hold for a while until the expected price increase to move more inline with the diff.
Today, you probably heard what happened on binance with a 32x rise in price. This was "made possible" by no blocks being mined for at least two hours. This jogged my memory on something that happened a couple years back that I'd forgotten all about. This also caused me to reasses my stance on the Z3 and whether it is good or bad for ZCash.
Leading up to the latest bitcoin halving , I was researching SHA256 coins to speculate on. At the time, I figured a lot of the SHA ASICs would move off of bitcoin and into alts after the halving took place. At the time I was trading on both polo and trex, so I wanted coins on both platforms. There were about three coins I settled on as I remember - DGB, Myriad, and CURE. Bought some of each on both exchanges.
A similar scenario unfolded with CURE as happened with BCN today There was a massive, MASSIVE, pump of CURE on Polo but price was mostly unchanged on trex. Sold my CURE on polo and initiated a transfer from trex to polo to sell the remainder. After some time, there were zero confirmations showing on trex. WTF? Searched out a block explorer for CURE and low and behold the chain was not moving. After some time, the pump was over and the chain began moving again.
There was certainly a nefarious actor on the mining side that had stalled the chain. I'm no expert on the technicals of how, but winning shares were being withheld by someone with a significant portion of that network's hashrate. Maybe someone else can chime in with the details on how this type of attack is perpetrated. Incidentally, CURE was delisted from polo a very short time later. Whether this was due to polo calling BS, or being complicit and tipping off somebody prior to the delisting announcement to get one last hoorah, the world will never know.
I also remember some talk around that time of excessive orphans happening on slushpool. It apparently ended up being an unintentional issue wherein one of the larger farms pointed at slush was withholding winning shares. This sounded very similar to what happened with CURE, but with so much more hashrate on the BTC network, others were finding winning shares to keep the chain moving.
So, how is this relevant to ZEC?
I believe the BCN attack was made possible by, and initiated with, Antminer X3s. Somebody has a lot of them and pulled this off.
I believe the CURE attack was perpetrated by a major holder of SHA256 ASICs. The CURE nethash was a drop in the bucket compared to bitcoin so it was probably a simple matter of pulling off BTC for a couple hours, attacking CURE, then returning to BTC (or whatever else they were moving at the time).
Not going to speculate on who waged these attacks, it's irrelevant. The important, common, factor is ASIC miners. I fear that the ZEC network will be vulnerable to this type of attack should action not be taken to resist ASICs. All it would take is two hours to completely trash it's reputation and the effort invested in getting it to where it is today.
Before you call me a GPU shill or ASIC fudder, consider that these things have actually happened and do your own research to refute the points being made. In either case, thank you for taking the time to read what I've written and I look forward to your feedback.
submitted by dunnmines to zec [link] [comments]

ICO Airdrop Bounty Hard fork smart contract ERC20 mining pool DApp Nhung khai niem co ban ban can biet khi tham gia vao thi truong Cryptocurrency

ICO Airdrop Bounty Hard fork smart contract ERC20 mining pool DApp Nhung khai niem co ban ban can biet khi tham gia vao thi truong Cryptocurrency
Blockchain và cryptocurrency là những lĩnh vực đầy mới mẻ, có nhiều khái niệm phức tạp với đa số công chúng. Xoay quanh tiền mã hóa, có những ý tưởng về ICO, hard fork, soft fork, ứng dụng phân quyền (DApp), hợp đồng thông minh (smart contract), Airdrop/Bounty, token ERC20, mining pool,… nổi cộm cần chúng ta nắm bắt. Vậy hôm nay, xin giải thích đến các bạn những khái niệm cơ bản nhất cần nắm vững trước khi bước chân vào lĩnh vực cryptocurrency.

1. ICO là gì?

ICO là gì? ICO (viết tắt của từ Initial Coin Offering) là một hình thức kêu gọi vốn đầu tư khá phổ biến trong các dự án cryptocurrency. Khi một công ty hay đội ngũ muốn phát hành cryptocurrency riêng, họ thường tạo ra một số lượng token nhất định và bán những token này cho nhà đầu tư trong các đợt mở bán, kêu gọi vốn đầu tư khác nhau.

Thông thường đội ngũ nhà phát triển sẽ chấp nhận cho nhà đầu tư thanh toán bằng Bitcoin hoặc Ethereum.

ICO là gì?

Nếu trong tài chính truyền thống, phát hành chứng khoán lần đầu ra công chúng là IPO thì ICO là đặc điểm riêng của cryptocurrency. ICO đại diện cho một hình thức kêu gọi vốn đầu tư thế hế mới, dựa trên niềm tin của cộng đồng với dự án đang phát triển, cũng như với đội ngũ và tiềm năng của nó. ICO ra đời giải quyết vấn đề nổi cộm là nhiều start-up có ý tưởng hay, công nghệ đột phá nhưng chưa có đủ vốn liếng để xây dựng – họ sẽ tìm đến ICO.

Vậy nhà đầu tư được lợi gì khi đầu tư ICO? Trước hết, lưu ý là không phải ICO nào cũng toàn”màu hường”, có những dự án rởm, lừa đảo hay đầu voi đuôi chuột nhan nhản trong cộng đồng. Nhưng nếu nhà đầu tư đã chọn lọc kỹ càng, chi tiền cho những ICO thực sự có tiềm năng, thì khi sản phẩm thực ra đời, token được lên sàn và chấp nhận rộng rãi thì giá token sẽ tăng vượt bậc so với giá khi nhà đầu tư mua vào lúc ICO. Và đó chính là lợi nhuận.

2. Token là gì?

Được nhắc đến ở trên, vậy token là gì?

Token là đồng tiền mã hóa được phát hành trong các đợt ICO. Token được phát hành dựa trên một nền tảng của coin nào đó. Ví dụ đa số token hiện tại được phát hành trên nền tảng Ethereum dựa theo chuẩn ERC-20. Một số token khác dựa trên nền tảng NEO, WAVES, STELLAR và có cả Bitcoin.
Token là gì?
Có thể phân token thành 2 loại dựa theo tính năng như sau:

2.1. Ultility Token là gì?

Ultility Token là token tiện ích. Ultility token được sinh ra để phục vụ cho một dự án với mục tiêu và tính năng cụ thể. Ví dụ, BNB token của Binance có tính năng giảm giá phí giao dịch…

2.2. Security Token là gì?

Security Token hay còn gọi là token chứng khoán là một dạng cổ phiếu điện tử phát hành dưới dạng token. Bạn sẽ được hưởng cổ tức dựa trên số cổ phần bạn sở hữu của dự án đó. Security token còn cho phép bạn có quyền bầu chọn hoặc tham gia quyết định một số công việc của dự án.

2.3. Lưu trữ token ở ví nào?

Bạn cần phải xác định được token đó hoạt động trên nền tảng blockchain nào.

  • Token của Ethereum: lưu trữ tại ví Ethereum như MyEtherWallet, MetaMask, Eidoo, ImToken…
  • Token của NEO: lưu trữ tại ví NeoTracker Walllet.
  • Token của Stellar: lưu trữ tại ví Stratis Wallet.
  • Tương tự với các nền tảng khác như Waves, QTUM, NEM…

3. ERC20 là gì?

ERC-20 là một tiêu chuẩn kỹ thuật được sử dụng cho các hợp đồng thông minh trên blockchain của Ethereum khi phát hành Token.

ERC20 là gì?

Địa chỉ ví của Token sử dụng công nghệ ERC20 sẽ có gán thêm 0x ở đầu và các loại Token này đều mua bằng Ethereum. Có thể lưu trữ token ERC20 ở ví MyEtherWallet một cách dễ dàng. Toàn bộ token ERC20 đều được giao dịch trên mạng lưới của Ethereum. Do đó địa chỉ ETH cũng là địa chỉ của các token đó.

Một ưu điểm ở công nghệ ERC20 là sự kết hợp với hợp đồng thông minh. Điều này sẽ giúp bạn giao dịch an toàn hơn, trong trường hợp bạn gửi Token cho người khác nhưng sai địa chỉ ví thì công nghệ này nó sẽ báo lỗi địa chỉ ví và bạn không thể gửi Token cho người khác được. Điều này rất tuyệt với nó sẽ giúp bạn bảo vệ tài sản của mình tốt nhất có thể.

Các Token sử dụng công nghệ ERC20 ngày càng trở nên phổ biến hơn. Thống kê vào đầu năm 2018 thì hầu hết các Token ban hành ra thị trường đều sử dụng trên nền tảng ERC20. Trong tương lại công nghệ này sẽ chiếm lĩnh thị trường và sẽ là nền tảng tốt nhất để phát triển các loại Token mới.

4. Smart Contract là gì?

Trong khi một hợp đồng bình thường bao gồm các điều khoản ràng buộc mối quan hệ của hai bên đối tác thì smart contract (hợp đồng thông minh) ràng buộc mối quan hệ đó bằng mã code.

Smart Contract là gì?
Đặc biệt hơn, các hợp đồng thông minh này sẽ thực thi những điều khoản đó một cách chính xác kể từ khi nó được lập trình bởi người sáng lập.

Trong một ví dụ đơn giản khác, người sử dụng Ethereum có thể gửi 10 ETH cho bạn của mình vào một ngày nào đó bằng smart contract. Trong trường hợp này, người dùng sẽ tạo một hợp đồng và để dữ liệu vào hợp đồng đó. Sau đó, hợp đồng này sẽ tự động thực thi theo lệnh đã được lập trình ban đầu.

5. DApp là gì?

White Paper của Ethereum phân chia Dapp (ứng dụng phân quyền) thành ba loại: các ứng dụng tài chính, các ứng dụng có liên quan đến tài chính (nhưng cũng cần một phần khác) và ứng dụng hoàn toàn khác như hệ thống bầu cử và quản trị.

Trong loại ứng dụng đầu tiên, người dùng có thể cần phải trao đổi Ether như là một cách để giải quyết hợp đồng với người dùng khác, sử dụng các node máy tính phân tán của mạng để tạo điều kiện cho việc phân phối dữ liệu.

Loại thứ hai là ứng dụng kết hợp tiền với thông tin từ bên ngoài blockchain.

DApp là gì?

Ví dụ, một ứng dụng bảo hiểm mùa màng phụ thuộc vào nguồn cung cấp thông tin thời tiết bên ngoài. Nếu một người nông dân sử dụng ứng dụng này, hệ thống sẽ tự động trả phí bảo hiểm nếu có hạn hán ảnh hưởng đến công việc của ông ấy.

Để thực hiện những hợp đồng thông minh này, ứng dụng dựa vào “oracles” – một hệ quản trị dữ liệu – để cập nhật thông tin về thế giới bên ngoài. Tuy nhiên, cần lưu ý là một số nhà phát triển hoài nghi rằng trường hợp sử dụng này có thể được thực hiện theo cách phân quyền.

Các tổ chức tự vận hành phân quyền là một trong những ý tưởng mô hình quản trị đầy tham vọng nhất của Dapp – loại thứ ba. Chẳng hạn như DAO App có mục tiêu là hình thành nên một công ty không có vị trí lãnh đạo, các quy tắc được lập trình ngay từ đầu về cách các thành viên có thể bỏ phiếu và làm thế nào để phát hành quỹ của công ty và sau đó … để cho nó tự vận hành.

6. Hard fork – Soft fork là gì?

6.1. Fork là gì?

Fork là một từ kỹ thuật thường được dùng bởi các nhà phát triển trong các dự án mã nguồn mở. Nó đơn giản chỉ là “cập nhật phần mềm” hay “sửa lỗi”. Ví dụ khi bạn cập nhật một ứng dụng trên chiếc smartphone (mobile app) thì bạn đã có được một bản Fork từ phiên bản cũ. Vì thế, khái niệm Fork trong Bitcoin và cryptocurrency cũng tương tự như vậy.

Đối với tiền mã hóa sẽ có hai loại Fork khác nhau là: Hard Fork và Soft Fork.

Hard fork – Soft fork là gì?

6.2. Hard Fork là gì?

Hard Fork là một bản cập nhật phần mềm bắt buộc và sẽ gây xung đột với phiên bản cũ hơn. Chương trình bị Fork sẽ không chạy được nếu không cập nhật nó. Ví dụ, có một lỗi (bug) quan trọng trong phần mềm, nếu muốn tiếp tục sử dụng thì cần phải cập nhật phần mềm.

Nếu không cập nhật – sẽ không sử dụng được chương trình. Ngoài ra, không có cách nào để đảo ngược một Hard Fork, trừ trường hợp có một số lỗi không mong đợi hay các vấn đề đi kèm. Đó là trường hợp sẽ phải làm thêm một Hard Fork và trở lại với phiên bản cũ.

Hard fork Bitcoin nổi tiếng nhất chính là Bitcoin Cash.

6.3. Soft Fork là gì?

Soft Fork là một bản cập nhật phần mềm không gây xung đột với phiên bản cũ hơn, nó không bắt buộc và cho phép mạng điều chỉnh thêm các tính năng mới trong khi đang xử lý. Mặc dù một Soft Fork đang cài đặt ngay cả khi máy tính chạy với chương trình cũ thì vẫn có thể sử dụng.

Nếu Soft Fork không hoạt động, có lỗi hay mọi người không chấp nhận nó thì nó hoàn toàn có thể đảo ngược và có thể trở lại với phiên bản cũ. Hầu hết các phần mềm bạn sử dụng ngày nay đều được kiểm soát bởi một thực thể duy nhất. Vì vậy, bất kỳ khi nào họ muốn Fork từ chương trình gốc thì chỉ cần cập nhật dưới hình thức một Soft Fork.

Phân biệt Hard fork và Soft fork.

7. Airdrop/Bounty là gì?

7.1. Airdrop là gì?

Airdrop đơn giản có nghĩa là “từ trên trời rơi xuống”. Nhưng trong thị trường cryptocurrency thì Airdrop là một khái niệm mới, có nghĩa là tiến hành phát các token/coin miễn phí vào ví của người dùng, khi người dùng đó thực hiện công việc là đăng ký tài khoản và giới thiệu người khác đăng ký tài khoản để nhận được các token miễn phí.

Đã có rất nhiều người kiếm được hàng trăm USD từ các đợt airdrop tiền mã hóa. Airdrop thường được sử dụng cho hoạt động ICO, với mục đích là quảng bá thương hiệu cũng như khuấy động sự hứng thú đối với dự án của mọi người.

7.2. Bounty là gì?

Bounty (săn phần thưởng) là hình thức bạn phải làm theo những yêu cầu nhất định, để đổi lại số lượng coin miễn phí nhất định khi hoàn thành những yêu cầu đó. Đây là một cách mà các coin mới cũng thực hiện rất nhiều, song song với những đợt Airdrop.

Airdrop/Bounty là gì?

Một số yêu cầu thông dụng trong Bounty như:
  • Đặt chữ ký trên Bitcointalk
  • Follow kênh Telegram
  • Viết bài giới thiệu dự án trên blog, medium
  • Follow, tweet trên Twitter
  • Đăng bài trên Facebook
  • Đăng bài, follow trên Linkedin
Ngoài ra, một số coin sẽ có các yêu cầu rất cao như phải like, share 3 – 5 bài viết của họ mỗi tuần, share nhiều thì được nhiều; tham gia kênh Telegram của họ hay phải đăng những link bài bạn share vào topic Bounty của họ trên hay phải share bài kèm hashtag (ví dụ như #ICO #ETH …), hoặc yêu cầu mỗi ngày chỉ được share 1 bài.

8. Mining Pool là gì?

Một trong những câu hỏi đầu tiên mà ai hứng thú đến việc đào cryptocurrency đều đặt ra đó là – máy đào tự chơi một mình hay tham gia vào các mining pool. Có nhiều lý do bạn nên và không nên tham gia vào pool. Tuy nhiên, nếu sự phân chia tốc độ Hash trên network Bitcoin phụ thuộc vào số máy đào nhiều hay ít, thì hầu hết nhà đào đều lựa chọn tham gia mining pool.

Mining Pool là gì?

Nếu đang do dự có nên tham gia vào mining pool hay không, bạn nên xem pool như là mô hình xổ số – với những ưu điểm và nhược điểm hoàn toàn giống nhau. Hoạt động một mình thì bạn không phải chia sẻ phần thưởng, nhưng tỷ lệ bạn đạt thưởng sẽ nhỏ đi rất nhiều. Mặc dù pool có cơ hội giải được block và giành được thưởng cao hơn, nhưng phần thưởng sẽ phải chia sẻ cho những thành viên tham gia pool.

Do đó, tham gia vào pool tạo ra một nguồn thu nhập ổn định, đều đặn, dù mỗi khoản bạn nhận được nhỏ hơn rất nhiều so với phần thưởng đầy đủ.

Dĩ nhiên, Bitcoin không chỉ là đồng coin duy nhất được đào ra – rất dễ để tìm thấy danh sách những pool đào cryptocurrency mà bạn đang nhắm đến.

Với những thợ đào mới tham gia – thiếu phần cứng đủ mạnh mẽ, thì có thể đào Altcoin thay vì Bitcoin – đặc biệt là những đồng tiền dựa trên thuật toán scrypt hơn là SHA256. Lý do là vì giải thuật Bitcoin rất khó khăn khi dùng những máy tính để bàn thông thường.

9. Tóm tắt

ICO là gì? ICO là một hình thức kêu gọi vốn đầu tư phổ biến trong các dự án cryptocurrency. Tương tự IPO với thị trường chứng khoán truyền thống.

Token là gì? Token là đồng tiền mã hóa được phát hành trong các đợt ICO. Token được phát hành dựa trên một nền tảng của coin nào đó.

ICO, Airdrop, Bounty, Hard fork, smart contract, ERC20, mining pool, DApp,… Những khái niệm cơ bản bạn cần biết khi tham gia vào thị trường Cryptocurrency?

ERC20 là gì? ERC-20 là một tiêu chuẩn kỹ thuật được sử dụng cho các hợp đồng thông minh trên blockchain của Ethereum khi phát hành Token.

Smart Contract là gì? Trong khi một hợp đồng bình thường bao gồm các điều khoản ràng buộc mối quan hệ của hai bên đối tác thì smart contract (hợp đồng thông minh) ràng buộc mối quan hệ đó bằng mã code.

DApp là gì? DApp (ứng dụng phân quyền) là những ứng dụng được xây dựng trên nền tảng blockchain, phục vụ vì những mục đích khác nhau. Khác với ứng dụng (app) thông thường trên di động, DApp mang trong mình những ưu điểm của công nghệ blockchain.

Hard Fork là gì? Hard Fork là một bản cập nhật phần mềm/blockchain bắt buộc và sẽ gây xung đột với phiên bản cũ hơn.

Soft Fork là gì? Khác với Hard Fork, Soft Fork là phiên bản cập nhật mới nhưng không bắt buộc, bản cũ và mới có thể chạy song song.

Airdrop/Bounty là gì? Airdrop/Bounty là những hình thức phân phát coin miễn phí cho người dùng, thường là với những coin/token mới cần được biết đến rộng rãi trong cộng đồng.

Mining Pool là gì? Để đào coin, thợ đào có thể tự trang bị máy đào tại nhà, tự khai thác một mình, hoặc lựa chọn tham gia vào các mining pool lớn – tập trung số lượng máy đào cao để tăng tính cạnh tranh, từ đó tăng xác suất đào được coin và có lợi nhuận.

Cập nhật tin tức mới nhất về blockchain và cryptocurrency tại
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Pre-ICO Announcement of Optonium coin

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OPTONIUM COIN solves the current problems of access to capital for the renewable energy developers and provides access to investments in profitable projects directly for the final consumers, any type of investors and energy market makers. This is done using the fast and transparent way through smart contracts on the Blockchain. By employing technology OPTONIUM COIN solves the following energy market insufficiencyy: global access to capital for green energy projects and green energy investments and trading as well as speed and transparency.
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