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      "author": "steemitboard",
      "body": "Congratulations @bluezoid! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@bluezoid/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/@bluezoid) and compare to others on the [Steem Ranking](http://steemitboard.com/ranking/index.php?name=bluezoid)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/7CiQEO.png\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-05\">SteemitBoard - Witness Update</a></td></tr></table>\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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      "body": "__1. Browser-Solidity  다운로드__\nhttps://github.com/ethereum/browser-solidity/ 에서 zip 파일을 다운로드 한다.\n![](https://cdn.steemitimages.com/DQmYzcHVk2d9spTrSSq297R13bsUBkY1k9EPjtbXSEiybK9/image.png)\n\n__2. 실행__\n다운로드한 zip 파일을 적당한 곳에 풀고 index.html을 크롬 부라우저로 연다.\n![](https://cdn.steemitimages.com/DQmSUpkau3JZjMYqyNABVc9yjCgApzqwpYWS6Wx9n4eZni6/image.png)\n\n__3. Contract 작성__\n좌측 상단의 (+) 기호를 클릭하여 새파일을 생성한다.\n![](https://cdn.steemitimages.com/DQmQScfN1jJKKUiJzcwG4k3sGhFJGxmesyRoLPgFzyF3Evv/image.png)\n- 파일명은 HelloWorld.sol 입력\n- 내용은\n``` javascript\npragma solidity  ^0.4.8;\n\ncontract HelloWorld {\n    string name;\n    uint number;\n    \n    constructor (string _name) public{\n        name = _name;\n    }\n\n    function getName() public constant returns (string) {\n        return name;\n    }\n\n    function getNumber() public constant returns (uint) {\n        return number;\n    }\n\n    function setNumber(uint _number) public {\n        number = _number;\n    }\n}\n```  \n<br>\n__4. 컴파일__\n우측상단의 [Compile] 탭 클릭 , 컴파일 화면에서 컴파일 및 error 및 warning 확인\n![](https://cdn.steemitimages.com/DQmP8USrvJtPrEVAK8T5HAKknMbG8p56WK9ab3hYJNFahaa/image.png)\n\n\n<br>\n__5. 테스트__\n - 오른쪽 [Run] 탭에서 Environment : JavaScript VM 을 확인하고\n - 계약을 생성하기 위한 초기값을 입력하고 [Create] 버튼을 클릭하여 생성한다.\n  [주의할 점은 HelloWorld의 경우 생성자의 인수값이 string 이므로 반드시 쌍따옴표(\") 를 사용하여 입력해야 한다.]\n\n![](https://cdn.steemitimages.com/DQmQRQ51bmZUqyWBRXrtvxZnQ1MakjNWawEPZtPrHKm9ooy/image.png)\n\n- 계약이 생성된후 모습\n![](https://cdn.steemitimages.com/DQmQXaG3WdJn419AuTvthAyJTZjGGPZUunGsT3ZBJESeFKV/image.png)\n\n- 우측에 표시된 계약에 정의된 함수들을 실행해본다.\n[getNumber, getName, setNumber 등의 함수가 기대대로 정상적인 작동을 하는지 확인]\n\n<br>\n__6. 이더리움 노드 접속 및 계약 배포, 실행__\n\n__6.1 로컬 노드 실행 및 account unlock__\n\n- 로컬노드 실행\nC:\\Geth>geth --networkid 1185 --nodiscover --maxpeers 0 --datadir C:\\Geth\\dev_data --rpc --rpcaddr \"0.0.0.0\" --rpcport 8545 --rpccorsdomain \"*\" --rpcapi \"admin,db,eth,debug,miner,net,shh,txpool,personal,web3\" console 2>> C:\\Geth\\dev_data\\geth.log\n\n- 사용할 account unlock\n\\>personal.unlockAccount(eth.accounts[0], \"pass0\", 0)\n\n![](https://cdn.steemitimages.com/DQmY2L1VKro4vrFNd2BbsN8iseZnqTC5p9umnh9MTQM7MfU/image.png)\n\n\n__6.2 이더리움 노드 접속__\n- 오른쪽 상단 메뉴중 [Run] 선택\n- Environment : [Web3 Provider] 선택\n- Web3 Provider Endpoint : http://localhost:8545 입력\n (로컬에 8545 포트로 Geth 실행중인 경우)\n\n![](https://cdn.steemitimages.com/DQmd9VQ5BichLpoacbDWssSi1NkUdotCYCks2Sgmi1nFZGz/image.png)\n\n__6.3 계약 배포__\n- 초기값 입력 후 [Create] 클릭\n![](https://cdn.steemitimages.com/DQmRgtSKhfdDwUK78QHDzf9Wc8wRiKFQX8nGCCxKznY8cZ6/image.png)\n\n- Geth 노드가 mining을 아직 실행하지 않은 경우 pending 상태\n![](https://cdn.steemitimages.com/DQmahjuKhPbr6JsJqKnyt3UjKUaY7pSSQY6JTxV5MpgM9Cw/image.png)\n\n- mining이 완료되어 계약이 배포된 상태\n![](https://cdn.steemitimages.com/DQmZ5GZe43GidKvTuoEQYsauUkzQoB22Y6vMq34rBNXbEiA/image.png)\n\n- 우측에 표시된 계약에 정의된 함수들을 실행해본다.\n[getNumber, getName, setNumber 등의 함수가 기대대로 정상적인 작동을 하는지 확인]",
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      "body": "[1]  윈도우 Geth 설치\nhttps://geth.ethereum.org/downloads/\n에서 윈도우용 Geth 설치 파일을 다운로드 한다.\n\n![](https://cdn.steemitimages.com/DQmUjyWpohnZqgmt9EHTqmik9SzkM7dxD3N2qLnVSpfn2DQ/image.png)\n\n설치파일을 실행하여 적당한 위치에 설치한다.\n\n![](https://cdn.steemitimages.com/DQmNQcBMPRvrTgXFGbYpAhqYrG2AqGdaF1QnfNGb1Nuny7z/image.png)\n\n![](https://cdn.steemitimages.com/DQmc5UiVZYvpQSde7DHRXSQEBB739siVCyzAvJ1mnbCiS7W/image.png)\n\n![](https://cdn.steemitimages.com/DQmQBWBjf5UGQwZHxWQedWc9MiBMBMca4LMQyEvtRvh77BF/image.png)\n\n[2] geth 초기화\ngeth -datadir C:\\zoid\\Geth\\dev_data init C:\\zoid\\Geth\\dev_data\\genesis.json\n![](https://cdn.steemitimages.com/DQmXC5GSbr1e5WT6ZZB8uadHUk7eZn3TiNrxZTDDhPGbvtJ/image.png)\n\n[3] geth 시작\ngeth -networkid 1185 -nodiscover -maxpeers 0 -datadir C:\\zoid\\Geth\\dev_data console 2>> C:\\zoid\\Geth\\dev_data\\geth.log\n![](https://cdn.steemitimages.com/DQmc7BGqpC39fP6AzcYs7N1FuW1RPtBEm4koJq8xTtCi32Z/image.png)\n\n[4] 기본적인 EOA 생성\n\\> personal.newAccount(\"pass0\")\n\"0x3a98a5ff23ba40406f248792261b2d9ed31d3597\"\n\\> personal.newAccount(\"pass1\")\n\"0x3d9d67dd2eff05dce02fb1a37084e709ddbfcccb\"\n\n[5] 잔고 확인\n\\>eth.getBalance(eth.coinbase) \n또는\n\\>eth.getBalance(eth.accounts[0])\n\n[6] 송금을 위한 계정 unlock\n\\>personal.unlockAccount(eth.accounts[0])\n\\>personal.unlockAccount(eth.accounts[0], \"pass0\") : 패스워드 함께\n\\>personal.unlockAccount(eth.accounts[0], \"pass0\", 0) : unlock시간, 0인경우 Geth 종료시까지\n\n[7] 송금\n\\>eth.sendTransaction({from:eth.accounts[0], to:eth.accounts[1], value:web3.toWei(5,\"ether\")})\n\n[8] 송금을 확정하기 위해 \n\\>miner.start(1)\n\\>miner.stop()\n\n![](https://cdn.steemitimages.com/DQmVCxbey61rtdeKM7LE6QMwTVT9Uyu676JzamK1buQMQTK/image.png)\n\n[9] Geth 기동시 HTTP-RPC 활성화\ngeth --networkid 1185 --nodiscover --maxpeers 0 --datadir C:\\zoid\\Geth\\dev_data --rpc --rpcaddr \"0.0.0.0\" --rpcport 8545 --rpccorsdomain \"*\" --rpcapi \"admin,db,eth,debug,miner,net,shh,txpool,personal,web3\" console 2>> C:\\zoid\\Geth\\dev_data\\geth.log",
      "json_metadata": "{\"tags\":[\"geth\",\"window\"],\"image\":[\"https://cdn.steemitimages.com/DQmUjyWpohnZqgmt9EHTqmik9SzkM7dxD3N2qLnVSpfn2DQ/image.png\",\"https://cdn.steemitimages.com/DQmNQcBMPRvrTgXFGbYpAhqYrG2AqGdaF1QnfNGb1Nuny7z/image.png\",\"https://cdn.steemitimages.com/DQmc5UiVZYvpQSde7DHRXSQEBB739siVCyzAvJ1mnbCiS7W/image.png\",\"https://cdn.steemitimages.com/DQmQBWBjf5UGQwZHxWQedWc9MiBMBMca4LMQyEvtRvh77BF/image.png\",\"https://cdn.steemitimages.com/DQmXC5GSbr1e5WT6ZZB8uadHUk7eZn3TiNrxZTDDhPGbvtJ/image.png\",\"https://cdn.steemitimages.com/DQmc7BGqpC39fP6AzcYs7N1FuW1RPtBEm4koJq8xTtCi32Z/image.png\",\"https://cdn.steemitimages.com/DQmVCxbey61rtdeKM7LE6QMwTVT9Uyu676JzamK1buQMQTK/image.png\"],\"links\":[\"https://geth.ethereum.org/downloads/\"],\"app\":\"steemkr/0.1\",\"format\":\"markdown\"}",
      "parent_author": "",
      "parent_permlink": "geth",
      "permlink": "geth",
      "title": "윈도우 Geth 설치 및 간단한 설정"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-08-02T14:35:21",
  "trx_id": "efb850dd8fa8c1aed6998ada62423d95d32a5249",
  "trx_in_block": 3,
  "virtual_op": 0
}

{
  "block": 22997933,
  "op": [
    "comment",
    {
      "author": "bluezoid",
      "body": "[이전 포스팅 참고]\n* https://steemit.com/gcp/@bluezoid/gcp-geth\n* https://steemit.com/geth/@bluezoid/geth-dapp\n\n\n### 간단한 solidity 프로그램을 작성하고, 배포 까지 해보자\n#\n\n1 - 간단한 solidity 프로그램 소스 작성\n```\npragma solidity  ^0.4.8;\n\ncontract SimpleStorage{\n    uint storedData;\n\n    function SimpleStorage(uint x){\n        storedData = x;\n    }\n\n    function set (uint x){\n       storedData = x;\n    }\n\n    function get() constant returns (uint){\n        return storedData;\n    }\n}\n```       \n# \n\n2 - 계약프로그램 빌드용 Data부분 출력\n$ solc -o ./ --bin --optimize SimpleStorage.sol\n\n* -0 : 출력할곳 지정\n* --bin : 출력 결과를 16진수로 표시\n* --optimize : 최적화 수행 옵션\n\n[ 다음과 같이 Warning 보인다.]\n![](https://cdn.steemitimages.com/DQmefVGYYqhaE9yy9dpAx8Bd6qW9HEgznm5iosgUA9fT93a/image.png)\n\n\n3 - 다음과 같이 소스를 수정해보자\n```javascript\npragma solidity  ^0.4.8;\n\ncontract SimpleStorage{\n    uint storedData;\n\n    constructor (uint x) public{\n        storedData = x;\n    }\n\n    function set (uint x) public{\n       storedData = x;\n    }\n\n    function get() public constant returns (uint){\n        return storedData;\n    }\n}\n```\n#\n \n[소스에 대한 간략한 설명]\n* pragma : 컴파일러 버전을 지정, 반드시 선언해야함\n* contract : 계약을 선언 자바의 클래스와 비슷함\n* constructor : 계약 생성자\n\n4-Contract 프로그램 빌드용 Data 부분 출력\n$cat SimpleStorage.bin\n![](https://cdn.steemitimages.com/DQmcae1vRN43tdkHgWMSMEnPDx9KVaE7kVBw6ngu5KUsych/image.png)\n\n5-계약 ABI(Application Binary Interface) 정보를 확인한다.\n* ABI : 말그대로 프로그램(계약)의 인터페이스 정의서\n\n$solc --abi SimpleStorage.sol\n```\n======= SimpleStorage.sol:SimpleStorage =======\nContract JSON ABI \n[{\"constant\":false,\"inputs\":[{\"name\":\"x\",\"type\":\"uint256\"}],\"name\":\"set\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\"\n,\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"get\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutabil\nity\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"name\":\"x\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"cons\ntructor\"}]\n```\n\n\n6- Geth 기동\n$geth --networkid 4649 --nodiscover --maxpeers 0 --datadir /home/devno3kaul/data_testnet console 2>> /home/devno3kaul/data_testnet/geth.log\n\n7- 계약 등록자 계정 잠금 해제\n\\> personal.unlockAccount(eth.accounts[0], \"pass0\", 0)\n\n8-계약을 블록체인에 등록한다.\n\n8-1 5번의 ABI정보를 사용한다.\n\\>simplestorageContract = web3.eth.contract([{\"constant\":false,\"inputs\":[{\"name\":\"x\",\"type\":\"uint256\"}],\"name\":\"set\",\"outputs\":[],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"constant\":true,\"inputs\":[],\"name\":\"get\",\"outputs\":[{\"name\":\"\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"name\":\"x\",\"type\":\"uint256\"}],\"payable\":false,\"stateMutability\":\"nonpayable\",\"type\":\"constructor\"}])\n\n![](https://cdn.steemitimages.com/DQmetL6kt3iu9PyGRiPQcqM437M4mdouqqPaMthgmLUxP1s/image.png)\n\n\n8-2 4번에서 출력한 data 정보를 사용한다. 16진수 표기를 위해 0x 를 붙인다.\n\\>simplestorage = simplestorageContract.new({from: eth.accounts[0], data:'0x608060405234801561001057600080fd5b506040516020806100f2833981016040525160005560bf806100336000396000f30060806040526004361060485763ffffffff7c01000000000000000000000000000000000000000000000000000000006000350416633bc5de308114604d5780635b4b73a9146071575b600080fd5b348015605857600080fd5b50605f6088565b60408051918252519081900360200190f35b348015607c57600080fd5b506086600435608e565b005b60005490565b6000555600a165627a7a723058207e61ade266b66887700143c38e99ebb466623be5599eb527f78129882deac76c0029', gas:3000000})\n\n![](https://cdn.steemitimages.com/DQmWumTqkKLTiRb3rZWVZ71ir2S2HHGeJoByqLeMoF1XizU/image.png)\n\n위에서 address 부분이 아직 undefined 이다. \n\n9- 채굴을 시작한다.\n\\>miner.start(1)\n\n10- simplestorage 를 다시 확인해본다.-계약이 블록체인에 등록된것을 확인한다.\n\\>simplestorage \n![](https://cdn.steemitimages.com/DQmWHs3iyRSoKPFgV4Vp9p4bonBCRjYLgNU2qxbA9Y7t5Ba/image.png)\naddress에 값이 생긴것을 확인한다.\n\n11- 계약에 접근하기 위한 변수를 생성\n\\> simpleObj = eth.contract(simplestorage.abi).at(simplestorage.address)\n\n12- 블록체인에 등록된 계약에 function을 호출해본다 (값을 11로 호출함)\n\\> simpleObj.set.sendTransaction(0, {from:eth.accounts[0]})\n\"0xe56059b67a9e75a44b6b8b29ddfe38e05c9c2d0171b9ce04a27b7b7fe88a8fb1\"\n\n13- 위 트랜젝션이 처리됐는지 확인한다.\n\\>eth.getTransaction(\"0xe56059b67a9e75a44b6b8b29ddfe38e05c9c2d0171b9ce04a27b7b7fe88a8fb1\")\n{\n  blockHash: \"0x7f226c020e0566f87ecbd4eb753425aa5a6eee5a0870aeac279f27b1d17b5601\",\n  blockNumber: 341,\n  from: \"0xead06f7ce504d82837e3241394f5498cfa3df00b\",\n  gas: 90000,\n  gasPrice: 18000000000,\n  hash: \"0xe56059b67a9e75a44b6b8b29ddfe38e05c9c2d0171b9ce04a27b7b7fe88a8fb1\",\n  input: \"0x60fe47b1000000000000000000000000000000000000000000000000000000000000000b\",\n  nonce: 10,\n  r: \"0x436684453ce9115f35735c8717bc5c93567c7d508cc61667087a86295fc9fca2\",\n  s: \"0x1d30d2c59502f1598162493bd97adaa65023c6035ca5833010b2b0b646e8bb26\",\n  to: \"0xec9071dd0941103058587136ffa5905561f3ff11\",\n  transactionIndex: 0,\n  v: \"0x66\",\n  value: 0\n}\n\n14- get을 호출해본다.\n\\>simpleObj.get.call({from:eth.accounts[0]})\n\n## 간단하게 Solidity코드로 Dapp을 개발 배포 까지 해봄",
      "json_metadata": "{\"tags\":[\"dapp\",\"solidity\",\"geth\"],\"image\":[\"https://cdn.steemitimages.com/DQmefVGYYqhaE9yy9dpAx8Bd6qW9HEgznm5iosgUA9fT93a/image.png\",\"https://cdn.steemitimages.com/DQmcae1vRN43tdkHgWMSMEnPDx9KVaE7kVBw6ngu5KUsych/image.png\",\"https://cdn.steemitimages.com/DQmetL6kt3iu9PyGRiPQcqM437M4mdouqqPaMthgmLUxP1s/image.png\",\"https://cdn.steemitimages.com/DQmWumTqkKLTiRb3rZWVZ71ir2S2HHGeJoByqLeMoF1XizU/image.png\",\"https://cdn.steemitimages.com/DQmWHs3iyRSoKPFgV4Vp9p4bonBCRjYLgNU2qxbA9Y7t5Ba/image.png\"],\"links\":[\"https://steemit.com/gcp/@bluezoid/gcp-geth\",\"https://steemit.com/geth/@bluezoid/geth-dapp\"],\"app\":\"steemit/0.1\",\"format\":\"markdown\"}",
      "parent_author": "",
      "parent_permlink": "dapp",
      "permlink": "solidity-dapp",
      "title": "간단한 Solidity Dapp 개발 배포"
    }
  ],
  "op_in_trx": 0,
  "timestamp": "2018-06-03T12:05:42",
  "trx_id": "41987de1711debe276260a157ba6acd7677974e9",
  "trx_in_block": 1,
  "virtual_op": 0
}

{
  "block": 22797338,
  "op": [
    "comment",
    {
      "author": "bluezoid",
      "body": "[간단한 Geth 설치 및 환경설정은 이전 포스트 참고\nhttps://steemit.com/gcp/@bluezoid/gcp-geth]\n\n### Geth 초기화 및 계정생성등 Dapp 개발을 위한 기본 셋팅 \n\n1 개발 디렉토리 생성\n$mkdir ~/data_testnet\n\n2 genesis.json 파일 생성\n$cd ~/data_testnet\n$vi genesis.json\n\n저는 아래와 같은 내용의 genesis.json 파일 생성함\n\n``` json\n{\n  \"config\": {\n    \"chainId\": 33,\n    \"homesteadBlock\": 0,\n    \"eip155Block\": 0,\n    \"eip158Block\": 0\n  },\n  \"nonce\": \"0x0000000000000033\",\n  \"timestamp\": \"0x0\",\n  \"parentHash\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n  \"gasLimit\": \"0x8000000\",\n  \"difficulty\": \"0x100\",\n  \"mixhash\": \"0x0000000000000000000000000000000000000000000000000000000000000000\",\n  \"coinbase\": \"0x3333333333333333333333333333333333333333\",\n  \"alloc\": {}\n}\n```\n<br>\n3 geth 초기화\n$geth --datadir /home/devno3kaul/data_testnet init /home/devno3kaul/data_testnet/genesis.json\n\n4  geth 구동(실행)\n$geth --networkid 4649 --nodiscover --maxpeers 0 --datadir /home/devno3kaul/data_testnet console 2>> /home/devno3kaul/data_testnet/geth.log\n\n - networkid 는 4649 사용\n - nodiscover : 생성자의 노드를 다른노드에서 검색할 수 없게 하는 옵션\n - maxpeers : 생성자의 노드에 연결할 수 있는 노드의 수를 지정, 0은 다른노드와 연결하지 않는다.\n - datadir : 데이터 디렉토리 지정\n - console : 대화형 자바스크립트 콘솔 기동\n - 2>> /home/devno3kaul/data_testnet/geth.log : 에러를 해당 경로의 파일로 저장, 리눅스 쉘명령임\n\n다음과 같이 실행됨\n![](https://cdn.steemitimages.com/DQmVHawEcgdqb7BQS1DQVoFF44hrYHqs3PV1bSEas3Z3bJL/image.png)\n\n\n5 EOA(Externally Owned Account):송금및계약실행가능계정 생성\n - 이더리움에는 두가지 종류의 계정이 있다, 하나는 EOA, 다른하나는 Contract 계정\n - EOA는 일반 사용자 계정, 비밀키로 관리 \n - Contract 계정은 계약을 블록체인에 배포할 때 만들어지는 계정으로 블록체인에 존재한다.\n\n\\>personal.newAccount(\"pass0\") \n\"0xead06f7ce504d82837e3241394f5498cfa3df00b\"\n\n\\>personal.newAccount(\"pass1\")\n\"0x24e73a3457a05b6910cd6078828d916ee159cc95\"\n\n==> 패스워드 꼭 기억할 것, 위에서는 두계의 EOA계정을 생성함\n\n6 geth 종료\n\\>exit\n\n7 쉘에서 EOA 생성\n$geth --datadir /home/devno3kaul/data_testnet account new\nINFO [04-24|05:14:05] 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: pass2 \nRepeat passphrase: pass2\nAddress: {79e122c5ade724ceeeba1c58eb2b403f39f5484b}\n\n8 쉘에서 EOA 확인\n$geth --datadir /home/devno3kaul/data_testnet account list\n\n9 송금 테스트를 위해 Ether가 필요하고 Ether를 얻기 위해 채굴이 필요함, 채굴을 해보자\n- geth 기동\n$geth --networkid 4649 --nodiscover --maxpeers 0 --datadir /home/devno3kaul/data_testnet console 2>> /home/devno3kaul/data_testnet/geth.log\n- 채굴 시작 , 별도의 콘솔에서 tail -100f ~/data_testnet/geth.log 로 진행사항 확인\n\\>miner.start(1)\n처음 채굴을 하는 경우 DAG  생성으로 약간 시간이 걸린다.\n- 채굴과 관련된 기본적인 명령어들\n\\>eth.coinbase ⇒ 현재 채굴보상 계정 확인\n\\>miner.setEtherbase(eth.accounts[1]) 명령어로 Etherbase를 변경할 수 있음\n\\>eth.getBalance(eth.coinbase)  채굴보상계정인 Etherbase계정의 잔고확인\n\\>eth.getBalance(eth.accounts[0]) 첫번째 계정의 잔고확인\n \\>web3.fromWei(eth.getBalance(eth.accounts[0]), \"ether\") ⇒ 웨이를 이더로 표시\n\n10 송금을 위해 계정 unlock\n\\>personal.unlockAccount(eth.accounts[0])\n\\>personal.unlockAccount(eth.accounts[0], \"pass0\") : 패스워드 함께\n\\>personal.unlockAccount(eth.accounts[0], \"pass0\", 0) : unlock시간, 0인경우 Geth 종료시까지\n\n\n11 Ether 송금\n\\>eth.sendTransaction({from:eth.accounts[0], to:eth.accounts[1], value:web3.toWei(10,\"ether\")})\n\\>eth.sendTransaction({from:eth.accounts[1] to:eth.accounts[2], value:web3.toWei(5,\"ether\")})\n\n12 Geth 기동시 HTTP-RPC 활성화 및 백그라운드 실행\n$nohup geth --networkid 4649 --nodiscover --maxpeers 0 --datadir /home/devno3kaul/data_testnet --mine -minerthreads 1 --rpc --rpcaddr \"0.0.0.0\" --rpcport 8545 --rpccorsdomain \"*\" --rpcapi \"admin,db,eth,debug,miner,net,shh,txpool,personal,web3\" 2>> /home/devno3kaul/data_testnet/geth.log &\n- --mine 옵션은 geth기동시 mining 실행함, 웬만하면 개발시에는 하지말자 쓸데없이 컴퓨팅 자원만 낭비됨 **특히나 구글 GCP에서 할 경우 구글이 정책위반이라고 경고와 함께 VM 정지 당하는 경우가 생김**  \n- & 백그라운드 실행(리눅스)\n\n12-1 Geth 기동시 HTTP-RPC 활성화 및 백그라운드 실행 마이닝옵션 빼고 \n$nohup geth --networkid 4649 --nodiscover --maxpeers 0 --datadir /home/devno3kaul/data_testnet --rpc --rpcaddr \"0.0.0.0\" --rpcport 8545 --rpccorsdomain \"*\" --rpcapi \"admin,db,eth,debug,miner,net,shh,txpool,personal,web3\" 2>> /home/devno3kaul/data_testnet/geth.log &\n\n13 json-rpc 명령 수행 , 원격접속해서 명령어 실행할 수 있음\n$curl -H \"Content-Type: application/json\" --data '{\"jsonrpc\":\"2.0\",\"method\":\"personal_listAccounts\",\"params\":[],\"id\":10}' localhost:8545\n\n$curl -H \"Content-Type: application/json\" -X POST --data '{\"jsonrpc\":\"2.0\",\"method\":\"personal_listAccounts\",\"params\":[],\"id\":10}' localhost:8545\n\n$curl -H \"Content-Type: application/json\" --data '{\"jsonrpc\":\"2.0\",\"method\":\"eth_mining\",\"params\":[],\"id\":10}' localhost:8545\n\n14 실행된 Geth에 rpc를 통해 Geth 콘솔에 접근하기\n$geth attach rpc:http://localhost:8545\n\n\n## 간단하게 Geth 초기화 및 계정생성 등 Dapp 개발을 위한 준비가 끝났다. 다음번 포스팅엔 간단한 Dapp을 개발해보자",
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      "body": "Congratulations @bluezoid! 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/firstpost.png)](http://steemitboard.com/@bluezoid) You published your First Post\n[![](https://steemitimages.com/70x80/http://steemitboard.com/notifications/firstvoted.png)](http://steemitboard.com/@bluezoid) You got a First Vote\n\nClick on any badge to view your own Board of Honor on SteemitBoard.\nFor more information about SteemitBoard, click [here](https://steemit.com/@steemitboard)\n\nIf you no longer want to receive notifications, reply to this comment with the word `STOP`\n\n> Upvote this notification to help all Steemit users. Learn why [here](https://steemit.com/steemitboard/@steemitboard/http-i-cubeupload-com-7ciqeo-png)!",
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      "body": "@@ -199,20 +199,20 @@\n  %5B%EC%BD%98%EC%86%94%EB%A1%9C %EC%9D%B4%EB%8F%99\n+%5D\n  %ED%81%B4%EB%A6%AD\n-%5D\n %0A!%5B%5D(htt\n",
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      "body": "[모든작업은 크롬에서 수행]\n\n1 GCP 활용을 위한 계정 생성및 서버생성.\n\n GCP 가입 및 무료계정을 만들고 간단하게 사용하는 방법은 \n다음 글에 쉽게 설명이 잘 되어 있습니다. \n\nhttps://brunch.co.kr/@topasvga/168\n\n2  생성된 구글 계정으로 로그인 하고 https://cloud.google.com/ 에 접속\n화면에서 [콘솔로 이동 클릭]\n![](https://steemitimages.com/DQmRjxwyuVEZvaetyBSR3WnyGoqjguDu3x4Eg1ea5rj66JV/image.png)\n\n3 GCP 콘솔화면에서 왼쪽 상단 햄버거메뉴 클릭후 > 중간쯤 [Compute Engine] 클릭\n![](https://steemitimages.com/DQmfMKDTJYKCDx3NxpEoFgv4KeKkA82GjtDwNa8jUMMEU6S/image.png)\n\n4 Compute Engine 화면에서 상단의 [인스턴스 만들기 클릭]\n![](https://steemitimages.com/DQmSy3nDXLgaWaoMC8KNyEsAwUvwAeHwptBPZo4SxGFWNAd/image.png)\n\n5 인스턴스 만들기 화면\n![](https://steemitimages.com/DQmQ2vabaRwQcm5PqcAtCfYkM8eXZexM5eJSi2ZPwpm9qGa/image.png)\n\n6 이름, 영역, 방화벽등 입력/선택 하고 부팅디스크 부분의 변경을 눌러 설치할 VM의 OS를 선택함\n![](https://steemitimages.com/DQmRWq4uzVuKLVaEtm4yeHArhFZGLdjcDmYrcRQWPAjEi1w/image.png)\n저는 Ubuntu 16.04 LTS 선택\n\n7 생성된 VM인스턴스 화면에서 SSH 창을 열고 작업\n![](https://steemitimages.com/DQmY7RipMTXCsCCcC7YN9Q211pyT1TdpS8evfNNk5eqvcx7/image.png)\n![](https://steemitimages.com/DQmNqeDM4bo6xQw3kjmbkuyG3jYqZt8WTpUDEEzioHAAY1b/image.png)\n\n8 go-lang 설치 (1.10.1버전 설치됨-2018년 5월 현재)\n$sudo add-apt-repository ppa:longsleep/golang-backports\n$sudo apt-get update\n$sudo apt-get install golang-go\n\n9 Geth 설치\n$sudo add-apt-repository -y ppa:ethereum/ethereum\n$sudo apt-get update\n$sudo apt-get install ethereum\n\n10 Solidity 컴파일러 설치\n$sudo apt-get install solc\n\n![](https://steemitimages.com/DQma27NxWhmL3YxqodAMo3i5mCW9QgsRdkuffXRAK5ZVcN2/image.png)\n\n\n## 이제 이더리움 개발을 해보자~!! ##",
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