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      "author": "steemitboard",
      "body": "Congratulations @mobycrypt! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@mobycrypt/birthday1.png</td><td>Happy Birthday! - You are on the Steem blockchain for 1 year!</td></tr></table>\n\n<sub>_You can view [your badges on your Steem Board](https://steemitboard.com/@mobycrypt) and compare to others on the [Steem Ranking](https://steemitboard.com/ranking/index.php?name=mobycrypt)_</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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      "author": "mobycrypt",
      "body": "![Bitcoin Accounts.png](https://cdn.steemitimages.com/DQmQ4v6S7o72i1g8HR4MLovYvrYtqAU8yrdc1zVUS1Gf5VW/Bitcoin%20Accounts.png)\n\nBitcoin Core API consist of functions allowing for interaction with Bitcoin node. These functions are used by many applications, platforms, exchanges which on daily basis interact with Bitcoin network. \n\nThe technology develops and changes in architecture are inevitable. In order to be up to date with the newest version, regular updates are required. Sometimes the update is just matter of choice (but if not done in the longer perspective leads to technical debt), but sometimes it's necessity - the proof of that is update of Bitcoin Core node to version 0.16.3 which was **must-have** because of security reasons (https://bitcoincore.org/en/2018/09/18/release-0.16.3).\n\nThe current Bitcoin Core API consist of few 'accounts' functions, which are marked as *deprecated* since some time. Let's analyze what can happen when this part of API will be finally removed/changed and what negative effects this can have.\n\n# Concept of Bitcoin accounts\n\nThe truth is that **there is not anything like *accounts* in Bitcoin technical terminology**. Bitcoin as a blockchain is simply just a chain of elements encrypted in the way that ensures the validity of the blockchain. These elements are *blocks*, *transactions*, *unspent transactions* and more, which from the nature of Bitcoin architecture are not assigned to anything like account. Bitcoin relies on the keys and it is important that conceptually keys are not related with anything like account (where the *account* concept exists for example in *Ethereum*).\n\n# Accounts in Bitcoin Core API\n\nEven if Bitcoin itself doesn't consist of *accounts* concept, it can be found in the Bitcoin Core API docs (https://bitcoin.org/en/developer-reference).  Example:\n\n![DeepinScreenshot_select-area_20181113131137.png](https://cdn.steemitimages.com/DQmXUcXYDjYnYfLTJvbddPAKHmBVbznPkhv37QqwCqdqN3E/DeepinScreenshot_select-area_20181113131137.png)\n\nThis API allows to create accounts associated with the Bitcoin address (public and private keys). Other functions allow sending transaction, checking balance or list received transactions associated with the account. In fact it's the abstraction provided by the API to simplify the interaction and development of applications using Bitcoin.\n\nThe functionality is not related with Bitcoin protocol however from development perspective is very useful part of the API. Every application which manages users and Bitcoin addresses (like cryptocurrency exchanges) have to deal with generation of new addresses, checking balances, sending transactions and many more.  In fact many applications use this *abstraction* to simplify development and interaction with Bitcoin. \n\n\nNevertheless all the *accounts*  related functions in API are deprecated. It means that these functions can still be used, however it's not recommended. These functions in future can be **removed or changed** - after all it will be incompatible changes.\n\n![DeepinScreenshot_select-area_20181113134516.png](https://cdn.steemitimages.com/DQmVT3hj3CqXTa39isqJWB5ifaaRAkc9iP3uk84RqktMqdR/DeepinScreenshot_select-area_20181113134516.png)\n\nWhat's interesting the discussion about the  accounting system started already some time ago. I found given thread of Bitcoin developers in Github from 2014, talking about changing /complete removal of all *acounts* features (https://github.com/bitcoin/bitcoin/issues/3816). One of the conclusions of these discussion is that any application should not rely on the accounting system but should implement it by it's own. This is quite strange and misleading statement, because why it should be avoided if it's in the official Bitcoin node API? There is really big probability that if it's part of the official API - it's already used by many applications.  \n\n# What will happen after incompatible *accounts* change?\n\nThe accounts system is the facade, API provided by the Bitcoin Core. If it would be removed - all *accounts* related function would be lost, what means that every application which was using it would have to implement it in own way. At the moment developers are discouraged to use *accounts* functions because all of the result provided by this part of API can be achieved using other functions, however it is more complicated. \n\nHow long *accounts* API will be yet accessible? How it will work after the change? Will it be ever changed? Well it's guessing, however it is probably smart **not to use** any *acounts* related functions since the future of it is rather dark.\n\n# What to do?\nAs said before - use API functions which are closer to the Bitcoin architecture. After all accounts are nothing more than description of Bitcoin keys. The *accounts* layer should be implemented on the top of Bitcoin Core API - becoming independent of the core changes. Checking balances, sending transactions - all of these can be achieved using functions related to transactions, utxo's which are (and on 99.99% will be yet for a long time) the part of Bitcoin technology.",
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      "author": "mobycrypt",
      "body": "The MobyCrypt platform enables creation and distribution of tokens based on blockchain technology. Using the mechanics of this technology and few econmic rules we enable **tokenization** - design, issuing and using this modern marketing tool, which is Personal/Loyalty Token.\n\n# What is the TOKEN?\n![1_3AxW3V0ZbB-e6vUS5os8UA.png](https://cdn.steemitimages.com/DQmcfDDPvK4ftwiPk8XhS9x3Dn38drfED7jWnKdJSSNgavx/1_3AxW3V0ZbB-e6vUS5os8UA.png)\n\n> Token is the digital record of ownership.\n\nToken doesn't exist in physical form, it's only the digital record saved in database. It has 2 main characteristics: **quantity** and **ownership**. In other words: token is the digital record saved in database describing some quantity owned by someone. Simplified example:\n\n*21,000,000.0 -> xxx*\n\nGiven assignment describes ownership of 21 millions of units belonging to some entity *xxx*.\n\nDigital entry of token exists in blockchain database within *smart contract*. Contracts are independent: given assignment of 21 millions of units belonging to entity *xxx* is totally independent when exists as the separated smart contracts.\n\nOne of the main characterstics of contract is its immutability. It means once created and saved in blockchain, contract cannot be changed. It's assured by mechanics of blockchain network based on the complex cryptography.\n\nSo token is the smart contract existing in blockchain database, describing some quantity assigned to some entity. In technical terminology these entities are called *accounts*. We are the owners and we control the account if know its public and private key (in simplified words: address and password). If we control the account, for which exists token assigment in the blockchain database - we are owners of these tokens.\n\nThe owner (and only) has the possibility of passing any quantity (no more than owned) to other account. Given record:\n\n*20,000,000.0 -> xxx,\n1,000,000.0 -> yyy.*\n\ndescribes the ownership of 20 millions tokens by account *xxx* and 1 tokens million by account *yyy*.\n\nTo summarise: token is the smart contract saved in the blockchain database. It aggregates the assigments of token quantities to  accounts. Owner of the account has total control over the tokens - there is no possibility to take it or steal it, however the owner has the possibility to pass the tokens to other account.\n\n# Smart contracts\n\nSmart contract is relatively new technical term describing software existing and running within blockchain technology.\n\nContract is the computer program. The computer program consist of the data and the functions. Smart contract is then the program and the describing data, saved in blockchain database and executed also using this technology.\n\nThe data of the token are all records describing the ownership. Functions of the token allow for example checking the quantity of owned tokens, or described previously transfer of tokens to other account.\n\n# Personal token, loyalty token.\n\n*Personal token* or *loyalty token* are the terms used to describe tokens, which underline **the way to use** tokens.\n\n*Personal token* describes the token issued by some person (e.g. sportsman, artist) - most often in order to promote the brand.\n\n*Loyalty token* is the token issued by some company, focused on engagement of the customers and marketing activities.\n\nBoth loyalty and personal tokens are used to interact with targeted audience. No matter if it's the fan of the artist or the customer of the company - they all can receive tokens from tokens creators as the benefit. \n\nThe value of tokens is determined by the possibility of use - proposed by the tokens creator. The issuer of tokens proposes the examples of use and the benefits of having/collecting the tokens. After all it's also the role of issuer to award the owners of the tokens.\n\n# Summary\n\nGiven examples describe how to use and benefit from the software based on the cutting-edge and decentralized technology. \n\nThe evolution of the blockchain causes the continous change in possibilities offered by the technology (decentralized applications) as well as interesting scenarios of use.",
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      "author": "mobycrypt",
      "body": "The MobyCrypt platform enables creation and distribution of tokens based on blockchain technology. Using the mechanics of this technology and few econmic rules we enable **tokenization** - design, issuing and using this modern marketing tool, which is Personal/Loyalty Token.\n\n# What is the TOKEN?\n![1_3AxW3V0ZbB-e6vUS5os8UA.png](https://cdn.steemitimages.com/DQmcfDDPvK4ftwiPk8XhS9x3Dn38drfED7jWnKdJSSNgavx/1_3AxW3V0ZbB-e6vUS5os8UA.png)\n\n> Token is the digital record of ownership.\n\nToken doesn't exist in physical form, it's only the digital record saved in database. It has 2 main characteristics: **quantity** and **ownership**. In other words: token is the digital record saved in database describing some quantity owned by someone. Simplified example:\n\n*21,000,000.0 -> xxx*\n\nGiven assignment describes ownership of 21 millions of units belonging to some entity *xxx*.\n\nDigital entry of token exists in blockchain database within *smart contract*. Contracts are independent: given assignment of 21 millions of units belonging to entity *xxx* is totally independent when exists as the separated smart contracts.\n\nOne of the main characterstics of contract is its immutability. It means once created and saved in blockchain, contract cannot be changed. It's assured by mechanics of blockchain network based on the complex cryptography.\n\nSo token is the smart contract existing in blockchain database, describing some quantity assigned to some entity. In technical terminology these entities are called *accounts*. We are the owners and we control the account if know its public and private key (in simplified words: address and password). If we control the account, for which exists token assigment in the blockchain database - we are owners of these tokens.\n\nThe owner (and only) has the possibility of passing any quantity (no more than owned) to other account. Given record:\n\n*20,000,000.0 -> xxx,\n1,000,000.0 -> yyy.*\n\ndescribes the ownership of 20 millions tokens by account *xxx* and 1 tokens million by account *yyy*.\n\nTo summarise: token is the smart contract saved in the blockchain database. It aggregates the assigments of token quantities to  accounts. Owner of the account has total control over the tokens - there is no possibility to take it or steal it, however the owner has the possibility to pass the tokens to other account.\n\n# Smart contracts\n\nSmart contract is relatively new technical term describing software existing and running within blockchain technology.\n\nContract is the computer program. The computer program consist of the data and the functions. Smart contract is then the program and the describing data, saved in blockchain database and executed also using this technology.\n\nThe data of the token are all records describing the ownership. Functions of the token allow for example checking the quantity of owned tokens, or described previously transfer of tokens to other account.\n\n# Personal token, loyalty token.\n\n*Personal token* or *loyalty token* are the terms used to describe tokens, which underline **the way to use** tokens.\n\n*Personal token* describes the token issued by some person (e.g. sportsman, artist) - most often in order to promote the brand.\n\n*Loyalty token* is the token issued by some company, focused on engagement of the customers and marketing activities.\n\nBoth loyalty and personal tokens are used to interact with targeted audience. No matter if it's the fan of the artist or the customer of the company - they all can receive tokens from tokens creators as the benefit. \n\nThe value of tokens is determined by the possibility of use - proposed by the tokens creator. The issuer of tokens proposes the examples of use and the benefits of having/collecting the tokens. After all it's also the role of issuer to award the owners of the tokens.\n\n# Summary\n\nGiven examples describe how to use and benefit from the software based on the cutting-edge and decentralized technology. \n\nThe evolution of the blockchain causes the continous change in possibilities offered by the technology (decentralized applications) as well as interesting scenarios of use.",
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      "body": "The beta release of MobyCrypt (https://mobycrypt.com) is now out. We are operating on testnets of Ethereum (Ropsten), Bitcoin (testnet3) and Litecoin (testnet4). \nThe Cryptorrency & Personal Token Platform beta is launched!\n\n![DeepinScreenshot_select-area_20181107183838.png](https://cdn.steemitimages.com/DQmTXXKPRdZMmpB9v3YDnBYUShPiM31qwseEJTZUtJqUMTr/DeepinScreenshot_select-area_20181107183838.png)\n\n# What is the MobyCrypt?\nMobyCrypt is:\n- **Cryptocurrency/Tokens Exchange** — modern and effective cryptocurrency/tokens exchange. Currently supports BTC/LTC, BTC/ETH and all of personal tokens markets,\n- **Personal Token Tool** — the tool which allows you to create, manage and distribute Personal Token.\n- **Tokens Catalog** — the place where you can explore personal tokens, its creators and services offered in exchange.\n\nOur platform gives the possibility to create personal tokens and crypto — token based markets.It means you can create the token and the trade it within minutes! With MobyCrypt you can also send and receive tokens from your customers in exchange of your services. We are focusing on creation the number one weapon for anyone who wants to create and utilize the cryptocurrency based personal tokens.\n\n# How it works?\nThe first neccessary step is to register in MobyCrypt: https://mobycrypt.com/register.\nPlease follow the registration instructions.\n\nAfter successful registration and sign in you will get the access to the platform.\n\nNow you have the possibility to trade in exchange or to create your own token and it’s market.\n\n![DeepinScreenshot_select-area_20180917214626.png](https://cdn.steemitimages.com/DQmWECZnS8csaLg8qLYZdW9KshJpubdKjK4dHpU7WrUdeuE/DeepinScreenshot_select-area_20180917214626.png)\n\n# How to check it out?\nIn order to test how it works you need to get the cryptos. **We are on testnet blockchains so do not deposit “real” cryptocurrencies. We will not be able to recover your funds.**\n\nYou can easily get free testnet cryptos on your MobyCrypt account. All you have to do is providing your MobyCrypt deposit addresses in given sites:\n\n- Get free Ether — https://faucet.ropsten.be/ or https://ethtools.com/ropsten/tools/faucet/\n- Get free Bitcoin — https://testnet.coinfaucet.eu/en/\n- Get free Litecoin — https://faucet.xblau.com/\nMobyCrypt will update your balances after about 3-10 minutes (depending of transactions confirmations).\n\n**We encourage you to play with MobyCrypt and check how it works!\nCreate your token.\nCreate your token markets.\nShare it with your community (by e-mail or link).\nReceive token from your customers.**\n\nDesign token based customer loyalty scheme and enable profits for you and your customers.\n\nExpect to hear more from us soon.",
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      "body": "You have recieved a free upvote from @saiduzzaman . For Nice Article , Carry On![comments.png](https://cdn.steemitimages.com/DQmaC49TifS5BxA6J5qcVan8KHLvpuwKqUgNpvZ3CMLh1oQ/comments.png)",
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      "body": "The beta release of MobyCrypt (https://mobycrypt.com) is now out. We are operating on testnets of Ethereum (Ropsten), Bitcoin (testnet3) and Litecoin (testnet4). \nThe Cryptorrency & Personal Token Platform beta is launched!\n\n![DeepinScreenshot_select-area_20181107183838.png](https://cdn.steemitimages.com/DQmTXXKPRdZMmpB9v3YDnBYUShPiM31qwseEJTZUtJqUMTr/DeepinScreenshot_select-area_20181107183838.png)\n\n# What is the MobyCrypt?\nMobyCrypt is:\n- **Cryptocurrency/Tokens Exchange** — modern and effective cryptocurrency/tokens exchange. Currently supports BTC/LTC, BTC/ETH and all of personal tokens markets,\n- **Personal Token Tool** — the tool which allows you to create, manage and distribute Personal Token.\n- **Tokens Catalog** — the place where you can explore personal tokens, its creators and services offered in exchange.\n\nOur platform gives the possibility to create personal tokens and crypto — token based markets.It means you can create the token and the trade it within minutes! With MobyCrypt you can also send and receive tokens from your customers in exchange of your services. We are focusing on creation the number one weapon for anyone who wants to create and utilize the cryptocurrency based personal tokens.\n\n# How it works?\nThe first neccessary step is to register in MobyCrypt: https://mobycrypt.com/register.\nPlease follow the registration instructions.\n\nAfter successful registration and sign in you will get the access to the platform.\n\nNow you have the possibility to trade in exchange or to create your own token and it’s market.\n\n![DeepinScreenshot_select-area_20180917214626.png](https://cdn.steemitimages.com/DQmWECZnS8csaLg8qLYZdW9KshJpubdKjK4dHpU7WrUdeuE/DeepinScreenshot_select-area_20180917214626.png)\n\n# How to check it out?\nIn order to test how it works you need to get the cryptos. **We are on testnet blockchains so do not deposit “real” cryptocurrencies. We will not be able to recover your funds.**\n\nYou can easily get free testnet cryptos on your MobyCrypt account. All you have to do is providing your MobyCrypt deposit addresses in given sites:\n\n- Get free Ether — https://faucet.ropsten.be/ or https://ethtools.com/ropsten/tools/faucet/\n- Get free Bitcoin — https://testnet.coinfaucet.eu/en/\n- Get free Litecoin — https://faucet.xblau.com/\nMobyCrypt will update your balances after about 3-10 minutes (depending of transactions confirmations).\n\n**We encourage you to play with MobyCrypt and check how it works!\nCreate your token.\nCreate your token markets.\nShare it with your community (by e-mail or link).\nReceive token from your customers.**\n\nDesign token based customer loyalty scheme and enable profits for you and your customers.\n\nExpect to hear more from us soon.",
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      "body": "![1_so8CQ-eW1RIA5uA1NJ8dAg.png](https://cdn.steemitimages.com/DQmRkQdnpXBsoTeebmsNcacutnZmA4z3KbL6YYrf544nsF2/1_so8CQ-eW1RIA5uA1NJ8dAg.png)\n\nThe node is the entry gate and facade between blockchain network and developer/application. The blockchain itself is network of nodes cooperating with each other. The node provide API for mining, managing accounts, sending transactions, interacting with smart contracts and more.\n\nDevelopment node is what in this article is meant by 1-node-blockchain. It gives us all the features of main network blockchain node + the control over mining. Interaction with development network is easy and what important: free.\nIn this article I will present all the steps to setup it within few minutes on Linux system (Arch).\n\n# Ethereum nodes\n\nEthereum has two leading nodes implementations: **Parity** (https://www.parity.io/ethereum/) and **Geth** (https://geth.ethereum.org/).\nAccording to https://www.ethernodes.org/network/1 Geth is lead running client. There might be differences between some extra features in these nodes implementations however we can be sure that both of them will implement https://github.com/ethereum/wiki/wiki/JSON-RPC API.\n\n# 1. Download and setup Geth.\n\nhttps://geth.ethereum.org/downloads/ is the link where depending of OS you have, any Geth executable can be download.\nIn my case I’ve downloaded Geth 1.8.17, 64 bit. If you are not sure about your CPU architecutre you can check it with uname -m bash command.\n\nAfter download extract:\n\n```bash\n~ tar zxvf <your-file-name>.tar.gz\n```\n\nThen:\n\n```bash\n~ ./<extracted-geth-folder>/geth --datadir ./FirstEthBlockchain account new\n```\n*<extracted-geth-folder>* is the folder of extracted Geth. There should be geth binary inside.\n\nYou will be asked for password. For sake of simplicity you don’t have to provide it. In my case the whole procedure was:\n\n```bash\n~ ./geth-linux-amd64–1.8.17–8bbe7207/geth --datadir ./FirstEthBlockchain account new \nINFO [10–23|19:41:25.141] Maximum peer count ETH=25 LES=0 total=25 \nYour new account is locked with a password. Please give a password. Do not forget this password. \nPassphrase: \nRepeat passphrase: \nAddress: {c7c7d647cf3e4f1b072422c0ab5120fe810ee3b2}\n```\n\nThe generated address is *c7c7d647cf3e4f1b072422c0ab5120fe810ee3b2*.\n\n# 3. Create genesis file. Initialize blockchain.\n\nThe genesis file is json structured file which describes among the other the initial settings needed to initialize the blockchain. It is the initial, first block.\nWe will create minimum of the gensis file which will contain only required fields.\n\nIn our case the file should be created in FirstEthBlockchain folder. The content of genesis.json is given:\n\n```javascript\n{\n “config”: {\n “chainId”: 1907,\n “homesteadBlock”: 0,\n “eip155Block”: 0,\n “eip158Block”: 0\n },\n “difficulty”: “10”,\n “gasLimit”: “2100000”,\n “alloc”: {},\n \"coinbase\": \"c7c7d647cf3e4f1b072422c0ab5120fe810ee3b2\"\n}\n```\n\n**Replace the coinbase key with the value of your account address, generated in step 1.**\n\nRun the blockchain initialization command:\n\n```bash\n~ ./<extracted-geth-folder>/geth --datadir ./FirstEthBlockchain init ./FirstEthBlockchain/genesis.json\n```\n\nIn my case the command was and result was:\n\n```bash\n./geth-linux-amd64–1.8.17–8bbe7207/geth --datadir FirstEthBlockchain init FirstEthBlockchain/genesis.json\nINFO [10-23|19:11:48.764] Maximum peer count                       ETH=25 LES=0 total=25 \nINFO [10-23|19:11:48.764] Allocated cache and file handles         database=/home/w/Downloads/FirstEthBlockchain/geth/chaindata cache=16 handles=16 \nINFO [10-23|19:11:48.777] Writing custom genesis block  \nINFO [10-23|19:11:48.777] Persisted trie from memory database      nodes=0 size=0.00B time=4.777µs gcnodes=0 gcsize=0.00B gctime=0s livenodes=1 livesize=0.00B \nINFO [10-23|19:11:48.777] Successfully wrote genesis state         database=chaindata                                              hash=357b5e…1b20b9 \nINFO [10-23|19:11:48.778] Allocated cache and file handles         database=/home/w/Downloads/FirstEthBlockchain/geth/lightchaindata cache=16 handles=16 \nINFO [10-23|19:11:48.795] Writing custom genesis block  \nINFO [10-23|19:11:48.795] Persisted trie from memory database      nodes=0 size=0.00B time=5.114µs gcnodes=0 gcsize=0.00B gctime=0s livenodes=1 livesize=0.00B \nINFO [10-23|19:11:48.796] Successfully wrote genesis state         database=lightchaindata                                              hash=357b5e…1b20b9\n```\n\n# 4. Start Ethereum node.\n\nOur goal is to run Ethereum node and communicate with it using RPC API. It’s just a HTTP based communication, most messages are JSON based.\n\nTo start Ethereum with RPC server enabled:\n\n```bash\n~ ./<extracted-geth-folder>/geth --rpc --rpcaddr localhost --rpcport 6666 --rpcapi “personal,eth,web3,net” ---datadir ./FirstEthBlockchain console\n```\n\nThe command is basically: initialize blockchain with RPC server listening on 6666 port (the port we will communicate with node). Enable personal, eth, web3, net APIs enabled via RPC api calls. Open interactive console just after Ethereum node start.\n\nIn my case the command and the result:\n\n```bash\n~ ./geth-linux-amd64–1.8.17–8bbe7207/geth --rpc --rpcaddr localhost --rpcport 6666 --rpcapi “personal,eth,web3,net” --datadir ./FirstEthBlockchain console \nINFO [10-23|19:49:35.997] Maximum peer count                       ETH=25 LES=0 total=25 \nINFO [10-23|19:49:35.998] Starting peer-to-peer node               instance=Geth/v1.8.17-stable-8bbe7207/linux-amd64/go1.11.1 \nINFO [10-23|19:49:35.998] Allocated cache and file handles         database=/home/w/Downloads/FirstEthBlockchain/geth/chaindata cache=768 handles=1024 \nINFO [10-23|19:49:36.021] Initialised chain configuration          config=\"{ChainID: 1907 Homestead: 0 DAO: <nil> DAOSupport: false EIP150: <nil> EIP155: 0 EIP158: 0 Byzantium: <nil> Constantinople: <nil> Engine: unknown}\" \nINFO [10-23|19:49:36.022] Disk storage enabled for ethash caches   dir=/home/w/Downloads/FirstEthBlockchain/geth/ethash count=3 \nINFO [10-23|19:49:36.022] Disk storage enabled for ethash DAGs     dir=/home/w/.ethash                                  count=2 \nINFO [10-23|19:49:36.022] Initialising Ethereum protocol           versions=\"[63 62]\" network=1 \nINFO [10-23|19:49:36.022] Loaded most recent local header          number=0 hash=357b5e…1b20b9 td=10 age=49y6mo1w \nINFO [10-23|19:49:36.022] Loaded most recent local full block      number=0 hash=357b5e…1b20b9 td=10 age=49y6mo1w \nINFO [10-23|19:49:36.022] Loaded most recent local fast block      number=0 hash=357b5e…1b20b9 td=10 age=49y6mo1w \nINFO [10-23|19:49:36.022] Regenerated local transaction journal    transactions=0 accounts=0 \nINFO [10-23|19:49:36.022] Starting P2P networking  \nINFO [10-23|19:49:38.188] UDP listener up                          self=enode://b9e92c81cc46c89924e7f46c23dc6f78a088a130cf1dd5806637af8b43c2c5dab6eb770139828c2a7c5fce5e4940772f9b3b1a95367c1cd43e672dc479678f16@62.87.191.226:30303 \nINFO [10-23|19:49:38.188] RLPx listener up                         self=enode://b9e92c81cc46c89924e7f46c23dc6f78a088a130cf1dd5806637af8b43c2c5dab6eb770139828c2a7c5fce5e4940772f9b3b1a95367c1cd43e672dc479678f16@62.87.191.226:30303 \nINFO [10-23|19:49:38.193] IPC endpoint opened                      url=/home/w/Downloads/FirstEthBlockchain/geth.ipc \nINFO [10-23|19:49:38.195] HTTP endpoint opened                     url=http://localhost:6666                            cors= vhosts=localhost \nWelcome to the Geth JavaScript console! \n \ninstance: Geth/v1.8.17-stable-8bbe7207/linux-amd64/go1.11.1 \nINFO [10-23|19:49:38.290] Etherbase automatically configured       address=0xc7c7D647CF3e4F1b072422c0AB5120fe810Ee3b2 \ncoinbase: 0xc7c7d647cf3e4f1b072422c0ab5120fe810ee3b2 \nat block: 0 (Thu, 01 Jan 1970 01:00:00 CET) \n datadir: /home/w/Downloads/FirstEthBlockchain \n modules: admin:1.0 debug:1.0 eth:1.0 ethash:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0 \n \n>\n```\n\nWell done. Server started, console is opened.\n\n\n# 5. Verify and test the blockchain.\n\nWe initialized the blockchain! The interactive console enables to execute node operations. Let’s check the current balance of the main account we previously created:\n\n```bash\n> eth.getBalance(eth.coinbase)\n0\n```\n\nThe balance is 0. We have currently just 1 block (genesis, with index 0). Let’s start mining:\n\n```bash\n> miner.start()\nINFO [10-23|19:50:14.286] Updated mining threads                   threads=8 \nINFO [10-23|19:50:14.286] Transaction pool price threshold updated price=1000000000 \nnull \n> INFO [10-23|19:50:14.287] Commit new mining work                   number=1 sealhash=6a7718…cc09c0 uncles=0 txs=0 gas=0 fees=0 elapsed=422.921µs \nINFO [10-23|19:50:18.778] Successfully sealed new block            number=1 sealhash=6a7718…cc09c0 hash=3cbd10…192cbd elapsed=4.491s \nINFO [10-23|19:50:18.778] 🔨 mined potential block                  number=1 hash=3cbd10…192cbd \nINFO [10-23|19:50:18.778] Commit new mining work                   number=2 sealhash=c46033…8e3acd uncles=0 txs=0 gas=0 fees=0 elapsed=124.783µs \nINFO [10-23|19:50:19.480] Successfully sealed new block            number=2 sealhash=c46033…8e3acd hash=2508d3…ef2775 elapsed=702.267ms \nINFO [10-23|19:50:19.480] 🔨 mined potential block                  number=2 hash=2508d3…ef2775 \nINFO [10-23|19:50:19.480] Commit new mining work                   number=3 sealhash=32ed88…3efbfb uncles=0 txs=0 gas=0 fees=0 elapsed=106.819µs \nINFO [10-23|19:50:19.492] Successfully sealed new block            number=3 sealhash=32ed88…3efbfb hash=616d95…ea81ad elapsed=11.744ms \nINFO [10-23|19:50:19.492] 🔨 mined potential block                  number=3 hash=616d95…ea81ad \nINFO [10-23|19:50:19.492] Commit new mining work                   number=4 sealhash=25afba…e45d01 uncles=0 txs=0 gas=0 fees=0 elapsed=142.264µs \nINFO [10-23|19:50:20.028] Successfully sealed new block            number=4 sealhash=25afba…e45d01 hash=ea8fa1…2ded23 elapsed=535.337ms \nINFO [10-23|19:50:20.028] 🔨 mined potential block                  number=4 hash=ea8fa1…2ded23 \nINFO [10-23|19:50:20.028] Commit new mining work                   number=5 sealhash=1b2621…c0e459 uncles=0 txs=0 gas=0 fees=0 elapsed=108.61µs\n> \n```\n\nStop it after few seconds with:\n\n\n```bash\n> miner.stop()\n```\n\nCheck the balance now:\n\n\n```bash\n> eth.getBalance(eth.coinbase) \n20000000000000000000\n```\n\nWe mine 5 Ethereum per 1 block. After 5 blocks I have 25 Ethers (the value is given in Wei. Use the converter: https://etherconverter.online/ to find out how much Ether is it).\n\n\n# 6. Test the RPC API.\n\nLast part is to check if we can remotely use our node API using RPC API.\nThe API should be accessible under port 6666 (the value was given in previous steps). Let’s verify the server using *curl*:\n\n```bash\n~ curl --data-binary '{\"jsonrpc\":\"2.0\",\"id\":\"curltext\",\"method\":\"eth_getBalance\",\"params\":[\"0xc7c7d647cf3e4f1b072422c0ab5120fe810ee3b2\",\"latest\"]}' -H 'content-type:application/json;' http://localhost:6666 -vvvv\n* Rebuilt URL to: http://localhost:6666/ \n*   Trying ::1... \n* TCP_NODELAY set \n* connect to ::1 port 6666 failed: Connection refused \n*   Trying 127.0.0.1... \n* TCP_NODELAY set \n* Connected to localhost (127.0.0.1) port 6666 (#0) \n> POST / HTTP/1.1 \n> Host: localhost:6666 \n> User-Agent: curl/7.60.0 \n> Accept: */* \n> content-type:application/json; \n> Content-Length: 124 \n>  \n* upload completely sent off: 124 out of 124 bytes \n< HTTP/1.1 200 OK \n< Content-Type: application/json \n< Date: Wed, 24 Oct 2018 07:11:17 GMT \n< Content-Length: 49 \n<  \n{\"jsonrpc\":\"2.0\",\"id\":\"curltext\",\"result\":\"0x2fb474098f67c0000\"} \n* Connection #0 to host localhost left intact\n```\n\nThis call checks the balance of coinbase account **(replace 0xc7c7d647cf3e4f1b072422c0ab5120fe810ee3b2 with your address)** in the latest mined block. \nThe result is hexadecimal encoded — you can use this tool: https://codebeautify.org/hex-decimal-converter to decrypt it. In my case the decimal result is: 55000000000000000000 (Wei), what is 55 Ethers.\n\n# Summary\n\nWe did the minimal setup of the private network Ethereum Geth node, which allows to interact with node via remote RPC API. The user has the control over the network, including mining.",
      "json_metadata": "{\"tags\":[\"ethereum\",\"programming\",\"blockchain\",\"developer\",\"mobycrypt\"],\"image\":[\"https://cdn.steemitimages.com/DQmRkQdnpXBsoTeebmsNcacutnZmA4z3KbL6YYrf544nsF2/1_so8CQ-eW1RIA5uA1NJ8dAg.png\"],\"links\":[\"https://www.parity.io/ethereum/\",\"https://geth.ethereum.org/\",\"https://www.ethernodes.org/network/1\",\"https://github.com/ethereum/wiki/wiki/JSON-RPC\",\"https://geth.ethereum.org/downloads/\",\"https://etherconverter.online/\",\"https://codebeautify.org/hex-decimal-converter\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}",
      "parent_author": "",
      "parent_permlink": "ethereum",
      "permlink": "setup-ethereum-development-node-in-5-minutes",
      "title": "Setup Ethereum development node in 5 minutes."
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-11-06T18:53:27",
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{
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  "op": [
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{
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      "creator": "steem",
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      "memo_key": "STM6o2aEpbmbpoxnNVLGMVZ4K2ov1DLSNzCPKwRuzZX6uHwvhpRUw",
      "new_account_name": "mobycrypt",
      "owner": {
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}