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      "permlink": "steemitboard-notify-ernest22-20190627t070832000z",
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      "body": "Congratulations @ernest22! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@ernest22/birthday2.png</td><td>Happy Birthday! - You are on the Steem blockchain for 2 years!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@ernest22) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=ernest22)_</sub>\n\n\n###### [Vote for @Steemitboard as a witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1) to get one more award and increased upvotes!",
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      "title": "Secret Contract - Private Smart Contract",
      "body": "### Background\nBlockchain stores all data publicly on it while it offers a open ledger for simple blockchain like Bitcoin, it might not be suitable to show every data publicly for more complicated application.\n\nUsing smart contracts to interact with the blockchain and other users could expose a lot of sensitive user data in current model. Completely open blockchain is not a practical environment when users have submit sensitive data like bank info and history to the smart contracts.\n\nSome dApp provider keeps the actual computation of eligibility centralized, in order to limit the exposure of the sensitive data to the provider itself. However, the dApp retains all of the weaknesses of centralized applications like single point of failure and easy target of attack.\n\n### Enigma Secure Contract\nThe Enigma team design Secret Contract, the smart contract that protects the blockchain correctness through distributed consensus while executed privately. Secret contract can hide the data completely from the nodes. The nodes can execute the contract and receive the eligibility result without being able to observe the user’s transactions. \n\nUnlike using Zero-knowledge proofs which a party with access to the data can prove a claim to others without revealing the data to them, secret contracts usually have to outsource computations to execute the contract involving multiple parties that there isn’t a single party can be trusted to know all of the data.\n\nFor secret contracts, secure computation is used to enable computing over encrypted data. Secure contracts are able to hide its exact data from the nodes in the network while preserving the ability to be executed and validated. \n\n### Development\nIn the first Enigma network release, it will make use of TEEs ( Trusted Execution Environments), the secure area inside any processor to conceal data from the network. In the second release, they will introduce secret contracts that are based on a purely cryptographic solution called secure Multi-Party Computation (MPC).\n\nRecently, Enigma has partnered with Intel on research and development efforts to advance development of privacy preserving computation technologies utilizing Intel technology to building a private, scalable, secure solution to power the real world daly usage of smart contracts with personal data.\n\n\n#### References\nhttps://blog.enigma.co/defining-secret-contracts-f40ddee67ef2\nhttps://blog.enigma.co/why-enigmas-privacy-protocol-will-power-our-decentralized-future-aedb8c9ee2f6\nhttps://blog.enigma.co/announcing-enigmas-collaboration-with-intel-43bbf73a86a7\nhttps://www.youtube.com/watch?v=wheVhJvuTok",
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      "title": "ZenCash Secure Nodes",
      "body": "## ZenCash Secure Nodes \n\nZenCash is a fork of ZClassic which is a also fork of ZCash. Like its origin, ZenCash also has private transaction using zk-SNARKS build on top of bitcoin codebase. ZenCash improves the security and the privacy of the network by introducing secure nodes.\n\nSecure nodes are similar to masternodes that can be found in other coins like Dash. However, their main function is not bringing extra features like instandsend into ZenCash, but to secure the whole network and improve censorship resistance.\n\n### Importance of Nodes \nNetwork communication among nodes in most of the blockchain network is unencrypted hence it is easily identified on the internet when a user accessing any blockchain data. Governments or attackers can censor or block the data especially for blocking the whole privacy focused blockchain which renders the privacy features inside the network useless. Moreover, the quality of the nodes are not guaranteed as we do not know what kind of machines are they running on or how frequent they are staying online so these nodes might face DDoS attack harming the whole network. \n\nPrivate transaction and communication worldwide is protected by the ZenCash secure nodes by encrypting the network connection and communication among the resilient secure nodes with valid security certificate. 3.5% mining reward is distributed to secure nodes operator to incentify people secure the network instead of relying on nodes ran by volunteer like on bitcoin.\n\nSecure nodes have to accept the daily “publish challenge” which nodes prove their hardware and network compatibility by regularly sending the z-transaction within the network. This also improves the privacy of user’s z-transaction as it would be less obvious when it is mixed with all the z-transaction by the secure nodes filled up the network.\n\n### Requirement \nTo run a ZenCash Secure Node, the node operator have to have 42 ZEN (~ 700 USD at current price) deposited and locked into their node transparent t-address just like other masternodes. \nThe machine that the node is running on should have enough processing power and 2.5+ GB of memory to withstand DDoS attacks and process private transactions. 92%+ uptime is also required to deliver a stable network and smooth user experience. \n\n### Development \nThere are 12,000 secure nodes online globally higher than 9600 full nodes of the bitcoin network, showing strong interest and decentralisation of the ZenCash project. The ZenCash Dev Team has actively announced the plans and updated whitepaper to add Super Nodes which introduces more features like side chains to the ZenCash network by the end of 2018. The secure node reward would be raised from 3.5% to 10% of the mining reward, and the super nodes would receive another 10% of the mining reward that can drive up the demand ZenCash.\n\n#### References\nhttps://zencash.com/securenodes/\nhttps://blog.zencash.com/secure-nodes-why-are-they-important/\nhttps://www.youtube.com/watch?v=pgTPy4D27Yg\nhttps://securenodes.eu.zensystem.io/\nhttps://blog.zencash.com/zencash-super-nodes-new-white-paper/",
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      "permlink": "progpow-asic-resistance-algorithm",
      "title": "ProgPoW ASIC resistance algorithm",
      "body": "@@ -3241,17 +3241,17 @@\n efore fu\n-t\n+r\n ther cha\n",
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      "title": "ProgPoW ASIC resistance algorithm",
      "body": "### Mining Algorithm\nProgPoW (Programmatic Proof of Work) is a proof-of-work algorithm designed to close the efficiency gap available to specialized ASICs.\n\nMining algorithm claims to be ASIC resistance generally uses extra parametres or mixing different algorithms to make the ASIC more complicated to be developed. However, ASIC manufacture can eventually develop their workaround with enough economic incentives like the popularity and the price rise of a coin.\n\nEthash has showed the strongest ASIC resistance (least efficiency gain) even Antminer E3 ASIC is released by Bitmain recently. Among ASIC resistant algorithm that has been “cracked” by ASICs like Equihash, CryptoNight, X11 which shows 50-1000x efficiency gain from ASICs, Ethash ASIC actually gains less than 2x efficiency over GPU making it a lot less favorable investment switching from GPU rigs to ASICs with higher risk and not much profit. Even Vitalik did not think the E3 ASIC is a big threat to Ethereum.\n\nProgPoW follows the same general structure of Ethash by having a large size of the DAG file that have to be loaded into the memory during computation, so the mining performance is limited by the memory size and speed which can hardly improve efficiency on as both GPU and ASIC are using memory on same technology level limiting any advantage.\n\n\nProgPoW improves upon Ethash by making the algorithm fits the hardware design of a GPU natively and efficiently use all the parts in a GPU to limit the efficiency gain of ASIC to maximum 1.1-1.2x. Therefore, the interest of developing an ASIC miner should decrease and GPU miners can still be profitable even there are ASICs in the market. ProgPoW is a programmable algorithm which can be tuned (even periodically) to fight ASIC by tweaking the parameters through a soft fork without a hard fork for algorithm change. \n\n### Dev Team\nOhGodACompany is the team created the OhGodAnETHlargementPill which is a plugin that successfully boost the performance of GTX1080ti and GTX1080 GPU by 50% mining Ethash. The team has shown strong background in developing and optimizing mining algorithm/software for GPU.\n\n### Why ASIC Resistance?\nASIC Resistance does not just help decentralisation and prevent the monopoly of miner manufactures, it also attract more interest and build the community to grow the project. One of the reason that Ethereum became such popular is the growth of the mining community who can participate in the network and get rewarded with just their home computer or even laptops. CPU and GPU mining are more accessible to the masses and bring them to experience cryptocurrency and blockchain before investing with serious money or even understand the technology behind.\n \nProgPoW can be easily implement into Ethash based coins and some other coin community also show strong interest in it. EIP-1057 has been proposed to implement ProgPoW into Ethereum and UIP-1 is proposed for Ubiq. The Ethereum community is not likely to pass the proposal at the moment while the Ubiq community has voted actively and the algorithm change will be implement into the mainnet soon. If Ethereum migration towards PoS does not go well or get delayed, ProgPoW might also be a good option to continue decentralisation before futther changes.  \n\n\n#### References\nhttps://github.com/ifdefelse/ProgPOW\nhttps://github.com/ethereum/EIPs/blob/master/EIPS/eip-1057.md\nhttps://github.com/ubiq/UIPs/blob/master/UIPs/uip-1.md\nhttps://steemit.com/mining/@gainer/ubiq-proposes-switch-to-progpow-to-dissuade-mining\nhttps://cryptoslate.com/vitalik-buterin-ethash-asics-ethereum\nhttps://www.youtube.com/watch?v=hzHVNe6jI2I",
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      "permlink": "bitcoin-addresses-and-what-is-bech32-bc1",
      "title": "Bitcoin Addresses & What is Bech32 (bc1)",
      "body": "#### Address validation\nRather than just checking for string length, allowed characters (0-9, A-Z, a-z), or that the address starts with a 1, 3 or bc1, a bitcoin address can be validate with a checksum built into the address. For a 25-byte legacy address, the last 4 bytes of the address is actually a checksum which is part of the double SHA-256 hash of the previous 21 bytes in the address. Therefore, with a wallet software that implement such checksum validation function, a mistyped address by user would be recognised and rejected when the checksum was computed by the first 21 bytes and compare with the one existing in the address.\n\n#### Bitcoin Address Formats\nThere are currently 3 address formats in use:\nLegacy Address (P2PKH): begins with the number 1\nSegwit & Multisig Address (P2SH): starting with the number 3 (better backward compatibility) \nSegwit & Multisig Address (Bech32): starting with bc1 (newer native Segwit format)\n\nLegacy P2PKH (Pay-to-PubkeyHash) Address simply locks the unspent fund with the redeemer hashed public key and unlock the fund by comparing Pubkey Hash\nP2SH (Pay-to-Script-Hash) Address allows funds to be locked in conditions like multisig in a basic smart contract way.\n\n\n#### Bech32 Development\nBech32 is implemented to bitcoin as BIP173 in late 2017 as an updated P2SH format that is less compatible with older softwares right now but it offers more optimal efficiency and security when more softwares support it.\n\nOne of the main differences of Bech32 format is that it is not case sensitive (only includes 0-9, a-z in the address), hence it avoids confusion when writing down and is easier to read out. As less characters are needed in the address, the address is encoded in Base 32 instead of the traditional Base 58 which is more convenient and efficient in computation, and also more widely adopted in other computer application. Data can be stored a lot more compactly to in QR code.\n\nThe double SHA256 checksum with the original Base 58 is slow and has no error-detection guarantees. Bech32 offers higher security with better optimise error detection code to the checksum to minimise the chance of accepting an invalid address. Most of the research on error-detecting codes only applies to Base 32 like formats making Bech32 more mature in security and technology.\n\nCurrently, only less than 1% of BTC is stored in Bech32 addresses in the whole network but the adoption rate has been growing since Dec 2017. Wallets such as Bitcoin Core, Electrum, Samourai Wallet, Coinomi are now fully supporting Bech32 addresses. Hardware wallets like Trezor and Ledger can use such addresses when pair with Electrum wallet. However, most exchanges and bitcoin ATM are not fully supporting the this format yet and among all the major exchanges only Coinbase supports withdrawal to Bech32 addresses. Although this address format is less popular right now, the adoption rate is rising just like the Segwit adoption by major wallets and exchanges few months before. This address format change is believed to be beneficial to the users to by protecting them from mistakes and confusion. Before we can really see easily readable words address being implemented, Bech32 could boost mass adoption by improving the user experience. \n\n\n\n\n##### References\nhttp://rosettacode.org/wiki/Bitcoin/address_validation#C\nhttps://medium.com/@hrobeers/p2sh-bitcoin-script-puzzle-explained-26c8cb03ff90\nhttps://github.com/bitcoin/bips/blob/master/bip-0173.mediawiki\nhttps://www.youtube.com/watch?v=NqiN9VFE4CU\nhttps://p2sh.info/dashboard/db/bech32-statistics?orgId=1\nhttps://en.bitcoin.it/wiki/Bech32_adoption",
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      "body": "Congratulations @ernest22! You have completed some achievement on Steemit and have been rewarded with new badge(s) :\n\n[![](https://steemitimages.com/70x80/http://steemitboard.com/notifications/voted.png)](http://steemitboard.com/@ernest22) Award for the number of upvotes received\n\n<sub>_Click on the badge to view your Board of Honor._</sub>\n<sub>_If you no longer want to receive notifications, reply to this comment with the word_ `STOP`</sub>\n\n\n\n**Do not miss the [last post](https://steemit.com/steemitboard/@steemitboard/steemitboard-world-cup-contest-argentina-vs-croatia) from @steemitboard!**\n\n---\n**Participate in the [SteemitBoard World Cup Contest](https://steemit.com/steemitboard/@steemitboard/steemitboard-world-cup-contest-collect-badges-and-win-free-sbd)!**\nCollect World Cup badges and win free SBD\nSupport the Gold Sponsors of the contest: [@good-karma](https://v2.steemconnect.com/sign/account-witness-vote?witness=good-karma&approve=1) and [@lukestokes](https://v2.steemconnect.com/sign/account-witness-vote?witness=lukestokes.mhth&approve=1)\n\n---\n\n> Do you like [SteemitBoard's project](https://steemit.com/@steemitboard)? Then **[Vote for its witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1)** and **get one more award**!",
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      "body": "@@ -1,8 +1,12 @@\n+### \n Backgrou\n@@ -8,16 +8,16 @@\n kground%0A\n-\n Currentl\n@@ -747,16 +747,20 @@\n ytes. %0A%0A\n+### \n Schnorr \n@@ -770,16 +770,16 @@\n natures%0A\n-\n Schnorr \n@@ -1253,16 +1253,20 @@\n  one. %0A%0A\n+### \n Developm\n@@ -1269,16 +1269,16 @@\n lopment%0A\n-\n Mu-sig i\n@@ -1759,16 +1759,20 @@\n ature.%0A%0A\n+### \n Advantag\n@@ -1775,16 +1775,16 @@\n ntages %0A\n-\n Schnorr \n@@ -2353,16 +2353,21 @@\n ivacy.%0A%0A\n+#### \n Referenc\n",
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      "title": "Bitcoin Scaling: Schnorr signatures for Bitcoin",
      "body": "Background\nCurrently, Bitcoin Multi-Signature address uses a simple but inefficient way to handle the transactions. Each participant of a Multi-sig (M out of Total N) has to sign separately and these signature would just be simply added up into a scriptSig and included in the transaction. The issue of Multi-Sig transaction size that it grows larger linearly as the number of participants increases, and the issue is apparent as the size occupied by each scriptSig is quite significant relative to the whole transaction size. For example, a simple transaction by a simple address could be 200 bytes while the scriptSig occupies 100 byes, so a transaction by a 3 of 4 multi-sig would be around 400 bytes while the sum of scriptSig being 300 bytes. \n\nSchnorr Signatures\nSchnorr signatures in Bitcoin developed by Pieter Wuille from Blockstream solves this problem by mathematically combining multiple signatures into a single signature. The combined signature has the size of a single signature while providing the authorization of the original separate signatures. Schnorr signature can also be more efficient and compact than a traditional (ECDSA) signature has it has a smaller size of 64 bytes comparing to around 75 bytes of the traditional one. \n\nDevelopment\nMu-sig is the current and latest implementation of Schnorr Signatures and is being worked on as a BIP that can be activated with a soft fork as Segwit provides versioning for Bitcoin script.\nMu-sig removes security and scalability drawbacks from previous implementation. Instead of verifying a signature according to each participants Public Key, Mu-sig will only need the sum of each participants public keys as a single public key  so validation would occur on chain with one signature.\n\nAdvantages \nSchnorr signatures offers faster validation for each transaction because only one pair of public key and signature is needed to validate through. \nOn-chain transaction size is reduced which space is saved for the blockchain storage. Schnorr signatures cannot bring privacy feature to all transaction on chain but it improves privacy for participants of a Multi-Signature wallet because it will be hidden that the signature is actually derived from multiple Private Keys. Combining with other technology, Schnorr signatures can have great impact on bitcoin scaling and privacy.\n\nReferences\nhttps://www.coindesk.com/one-mathematicians-mission-boost-bitcoins-privacy-soon/\nhttps://www.coindesk.com/schnorr-signatures-explained-bitcoin-tech/\nhttps://hackernoon.com/excited-for-schnorr-signatures-a00ee467fc5f\nhttp://diyhpl.us/~bryan/papers2/bitcoin/bitcoin-tech-dev-talks-schnorr-signatures.2018-02-01.pdf\nhttps://www.youtube.com/watch?v=oTsjMz3DaLs\nhttps://bitcointechtalk.com/scaling-bitcoin-schnorr-signatures-abe3b5c275d1",
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      "title": "Schnorr signatures for Bitcoin",
      "body": "Background\nCurrently, Bitcoin Multi-Signature address uses a simple but inefficient way to handle the transactions. Each participant of a Multi-sig (M out of Total N) has to sign separately and these signature would just be simply added up into a scriptSig and included in the transaction. The issue of Multi-Sig transaction size that it grows larger linearly as the number of participants increases, and the issue is apparent as the size occupied by each scriptSig is quite significant relative to the whole transaction size. For example, a simple transaction by a simple address could be 200 bytes while the scriptSig occupies 100 byes, so a transaction by a 3 of 4 multi-sig would be around 400 bytes while the sum of scriptSig being 300 bytes. \n\nSchnorr Signatures\nSchnorr signatures in Bitcoin developed by Pieter Wuille from Blockstream solves this problem by mathematically combining multiple signatures into a single signature. The combined signature has the size of a single signature while providing the authorization of the original separate signatures. Schnorr signature can also be more efficient and compact than a traditional (ECDSA) signature has it has a smaller size of 64 bytes comparing to around 75 bytes of the traditional one. \n\nDevelopment\nMu-sig is the current and latest implementation of Schnorr Signatures and is being worked on as a BIP that can be activated with a soft fork as Segwit provides versioning for Bitcoin script.\nMu-sig removes security and scalability drawbacks from previous implementation. Instead of verifying a signature according to each participants Public Key, Mu-sig will only need the sum of each participants public keys as a single public key  so validation would occur on chain with one signature.\n\nAdvantages \nSchnorr signatures offers faster validation for each transaction because only one pair of public key and signature is needed to validate through. \nOn-chain transaction size is reduced which space is saved for the blockchain storage. Schnorr signatures cannot bring privacy feature to all transaction on chain but it improves privacy for participants of a Multi-Signature wallet because it will be hidden that the signature is actually derived from multiple Private Keys. Combining with other technology, Schnorr signatures can have great impact on bitcoin scaling and privacy.\n\nReferences\nhttps://www.coindesk.com/one-mathematicians-mission-boost-bitcoins-privacy-soon/\nhttps://www.coindesk.com/schnorr-signatures-explained-bitcoin-tech/\nhttps://hackernoon.com/excited-for-schnorr-signatures-a00ee467fc5f\nhttp://diyhpl.us/~bryan/papers2/bitcoin/bitcoin-tech-dev-talks-schnorr-signatures.2018-02-01.pdf\nhttps://www.youtube.com/watch?v=oTsjMz3DaLs\nhttps://bitcointechtalk.com/scaling-bitcoin-schnorr-signatures-abe3b5c275d1",
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      "body": "Background\nCurrently, Bitcoin Multi-Signature address uses a simple but inefficient way to handle the transactions. Each participant of a Multi-sig (M out of Total N) has to sign separately and these signature would just be simply added up into a scriptSig and included in the transaction. The issue of Multi-Sig transaction size that it grows larger linearly as the number of participants increases, and the issue is apparent as the size occupied by each scriptSig is quite significant relative to the whole transaction size. For example, a simple transaction by a simple address could be 200 bytes while the scriptSig occupies 100 byes, so a transaction by a 3 of 4 multi-sig would be around 400 bytes while the sum of scriptSig being 300 bytes. \n\nSchnorr Signatures\nSchnorr signatures in Bitcoin developed by Pieter Wuille from Blockstream solves this problem by mathematically combining multiple signatures into a single signature. The combined signature has the size of a single signature while providing the authorization of the original separate signatures. Schnorr signature can also be more efficient and compact than a traditional (ECDSA) signature has it has a smaller size of 64 bytes comparing to around 75 bytes of the traditional one. \n\nDevelopment\nMu-sig is the current and latest implementation of Schnorr Signatures and is being worked on as a BIP that can be activated with a soft fork as Segwit provides versioning for Bitcoin script.\nMu-sig removes security and scalability drawbacks from previous implementation. Instead of verifying a signature according to each participants Public Key, Mu-sig will only need the sum of each participants public keys as a single public key  so validation would occur on chain with one signature.\n\nAdvantages \nSchnorr signatures offers faster validation for each transaction because only one pair of public key and signature is needed to validate through. \nOn-chain transaction size is reduced which space is saved for the blockchain storage. Schnorr signatures cannot bring privacy feature to all transaction on chain but it improves privacy for participants of a Multi-Signature wallet because it will be hidden that the signature is actually derived from multiple Private Keys. Combining with other technology, Schnorr signatures can have great impact on bitcoin scaling and privacy.\n\nReferences\nhttps://www.coindesk.com/one-mathematicians-mission-boost-bitcoins-privacy-soon/\nhttps://www.coindesk.com/schnorr-signatures-explained-bitcoin-tech/\nhttps://hackernoon.com/excited-for-schnorr-signatures-a00ee467fc5f\nhttp://diyhpl.us/~bryan/papers2/bitcoin/bitcoin-tech-dev-talks-schnorr-signatures.2018-02-01.pdf\nhttps://www.youtube.com/watch?v=oTsjMz3DaLs\nhttps://bitcointechtalk.com/scaling-bitcoin-schnorr-signatures-abe3b5c275d1",
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