[솔리디티] Geth로 이더리움 네트워크 접속하기

이더리움 네트워크 : P2P 네트워크

- 와이어라는 정의된 프로토콜에 기반하여 정확히 동일한 방식으로 노드 간에 통신하고 작동하도록 설계

 

네트워크 상 크게 2가지 형태의 노드​

채굴 노드

-최신 트랜잭션을 처리하여 블록체인에 저장.

- 합의알고리즘을 성공적으로 수행하면 거래 수수료와 채굴보상(이더)를 받음.

- 블록체인에 추가한 블록을 네트워크의 다른 피어에게 전파.

- 채굴 노드는 새로운 블록을 생성하므로(기술적으로는 소비자이지만)생산자 역할을 함.

- 상대적으로 많이 보상받기 위해 트랜잭션 처리, 블록 생성, 작업증명에 최적화된 클라이언트를 실행.

​

전체 노드

- 주로 인접한 피어가 보낸 블록의 유효성을 검증하고 나머지 네트워크로 블록을 다시 전파.

- 소비자 역할을 함.

- 전체노드는 높은 성능이 필요하지 않아 다양한 프로그래밍 언어로 표준 클라이언트가 있음.

- Go 이더리움 (geth)이 가장 인기있는 클라이언트.

 

 

Geth로 이더리움 네트워크 접속하기

https://geth.ethereum.org/downloads/

Downloads | Go Ethereum

 

1. 위의 링크를 방문 하여 윈도우용 Geth를 다운

 

2. 다운로드 완료 후 설치 진행

- 개발 툴도 체크해준다

 

3. geth 실행

- 매개 변수 없이 geth를 실행하면 , 메인넷이라 부르는 퍼블릭 네트워크에서 전체모드로 동기화를 시작함.

- 블록체인 전체 동기화 시 , 하드웨어 및 인터넷 연결에 따라 몇 시간에서 며칠이 걸릴 수 있음.

- 이더리움 지갑이 열려있으면, 동일한 포트 번호를 사용하게 되므로 geth 시작 전에 닫아줌.

- geth가 블록체인 전체를 동기화하면 콘솔창에 뜨는 내용들이 느려지고 실시간으로 새 블록이 블록체인에 추가되는 것을 보여줌.

 

 

- 빠른 실행을 원한다면 전체 블록체인을 로컬로 받지 않아도 되며, 지갑을 사용하는 경우 Fast 모드 혹은 light 모드로 동기화

 

geth --syncmode "light"

C:\Program Files\Geth>geth --syncmode "light"

 

4. 대화형 콘솔 시작

- geth는 자바스크립트 문법을 사용할 수 있는 대화형 콘솔을 제공.

- web3.js를 내장 : 이더리움 클라이언트를 활용할 수 있는 공식적인 고급 언어 라이브러리인 Web3의 자바스크립트 구현

 

geth 클라이언트가 동일한 컴퓨터에서 실행되고 있지 않은 경우

geth console

C:\Program Files\Geth>geth console

geth 클라이언트가 이미 시스템에서 실행중인 경우

geth attach ipc:\\.\pipe\geth.ipc

 

C:\Program Files\Geth>geth attach ipc:\\.\pipe\geth.ipc

Microsoft Windows [Version 10.0.19043.1466]
(c) Microsoft Corporation. All rights reserved.

C:\Users\coco>cd C:\Program Files\Geth

C:\Program Files\Geth>geth attach ipc:\\.\pipe\geth.ipc
Welcome to the Geth JavaScript console!

 modules: admin:1.0 debug:1.0 eth:1.0 ethash:1.0 les:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 vflux:1.0 web3:1.0

To exit, press ctrl-d or type exit
>

 

버전 정보 표시

web3.version

-web3 라는 Web3객체는 콘솔을 열 때 내부적으로 인스턴스화 됨.

 

-버전 객체의 하위 속성 중 특정 속성 만을 확인 가능

- 콘솔에서 자바스크립트 문법 사용 가능

한 줄 실행시 마다 undefined 혹은 null 이 나오는 이유는 아직 모름...

> var apiVersion = web3.version.api
undefined
> var nodeVersion = web3.version.node
undefined
> console.log('Api version: ' + apiVersion)
Api version: 0.20.1
null
> console.log('Node version: ' + nodeVersion)
Node version: Geth/v1.10.15-stable-8be800ff/windows-amd64/go1.17.5
null
>

 

연결상태확인

- web3.net 객체에서 클라이언트 연결 정보를 얻을 수 있음.

- web3 네임스페이스는 암시적으로 참조되므로, 생략 가능

 

net

- net 객체의 개별 속성에 접근 가능

 

> console.log('this geth instance is listening for network connections : ' + web3.net.listening)
this geth instance is listening for network connections : true
null
> console.log('number of peers connected to this geth instance : ' + web3.net.peerCount)
number of peers connected to this geth instance : 11
null

노드에 대한 자세한 정보

- web3.admin 객체를 사용하여 호출

 

admin.nodeInfo

- 연결된 피어에 대한 자세한 정보

admin.peers

 

블록체인에 접속하기

-web3.eth 객체는 클라이언트와 블록체인의 실시간 정보를 가져옴.

 

가장 최근에 추가된 블록 번호

eth.blockNumber

> var latestBlockNum = eth.blockNumber
undefined
> console.log('Latest block #: ' + latestBlockNum)
Latest block #: 14178069
null
>

 

해당 블럭의 요약된 정보

eth.getBlock()

> eth.getBlock(latestBlockNum)
{
  baseFeePerGas: 51288944400,
  difficulty: 12912107325585107,
  extraData: "0xe4b883e5bda9e7a59ee4bb99e9b1bc461721",
  gasLimit: 30094470,
  gasUsed: 28246374,
  hash: "0xe4a57fc4603bee2a310ecb85b932863714fcfda7daab5d5350f0714faf99dfca",
  logsBloom: "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",
  miner: "0x829bd824b016326a401d083b33d092293333a830",
  mixHash: "0x33f632eb5f23788ea549811c118fe328b76dbc6be3a452f5816ba7e517f96419",
  nonce: "0x3eace3598a30d8c4",
  number: 14178069,
  parentHash: "0x3d836eb6c8369989ee15fa79d8b475c02dc95912bc02500963aecc1eeeb336b0",
  receiptsRoot: "0x144a8d47a466c07a27681cc60afe1ffd95b0f2a7b2d46d50de1ca24d6346e2ab",
  sha3Uncles: "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
  size: 161337,
  stateRoot: "0xca7d6bdb5ed9b03d19b77b33c447360858436199e4b440d2f4caf3295ed5d188",
  timestamp: 1644492472,
  totalDifficulty: 4.1126675094656519562271e+22,
  transactions: ["0xf71ccbdc0769fbd1468f7270ec28c78eb88c4e08c4768f1b89359546af223174", "0x3415abe59549f1dc0dde6c99988bc73e05e41d72ce82eb0449d28f5de0f7d2f6", "0x090cc6b118ad6f8363dd088d41e8d34d62122ef9006f20d3bdd91a0f89ea6f22", "0x11c1f77a032356b4fe39980228bde9aeb1c68223778aa17b05f7e05e9821e99c", "0xea8f6096b3797910891685a2b0212978a819c16948ceb4672db7ace266c47c0b", "0x45fe64f9ef6bfa33306ebedc35ebf6ce197ad4d2f7d2ec376fdb4f1671f5c713", "0x96d1e8b0ee2a4663a1ab57d576d45ccbe7f256fc8424acabe90cc5ee12d03add", "0x0d99c349fa883887746b4d63a82ca42f93e01b478f8847a133d86f2574acdaca", "0x66d947cd9516af4f7108143004a59b2865ab2840f1ad41b926ac723ac99f2d65", "0x4f4694c2fe652f82c7c650eeb594882d90072ee4b503dd176dd8f317822615ae", "0xc2ea0706f108019386dfe90419b67f59ed38487820abb052c45620e4d3ea2990", "0x42c0df8ebd4ab200621fa1be7a1256386ddea3ee48631afcafabb774e519d846", "0xd98f4e3ea888413a3314a620e4541525e0cfc318eca3eca0257af7111b862d38", "0x208ebfabda6fb9731a0a71154eddf6e2ffbd6b3b0f45a658d998fdcef8b5d66f", "0x218956ded050db340cf6f8b7c8dc58ec9210f83bfb4299338a25ebe71168ba20", "0x23f4520de8a508bb5bcf4089755f7250c9deef6c12f82fc28b0136011e853cf9", "0x404e3e0de28391c326c46f2176261c766f694f49017b19e484056622b71d5b2e", "0x5a425fbf559e54908d5a6366e16bd2bbe73180634cedac45ef29a48125a039d8", "0x98d1ccbe7ffea640a2b9a09a67d69ee4f270d2322ebc0127c44385cac72b963f", "0xd658a2113faa9e6b7be1b086bbe0e69f92a90950b1d96a1e73fd1dda7995b612", "0xe1860da2b44bb048a8d4b305148bd251541d364e32e0947f18bc159e66993208", "0xb6095ec2393ed9e38a49b8c22f252606844a2c59aca2f281e0fa57721d5baf79", "0x87aa7f5d2410b7b01ae356e95fb0a24558edebcea0409a78eba41a7829299faa", "0x7fc51b65149bb33122a5064ef01ddcd0854502fbc828887530f0b8e9d932174e", "0x05127df321d2e02a3d7b1f869de7df60594565df66d9854b122d73523e6214df", "0x156210021f726da1c766289e774a0ca730f4ca7b8ae4f1994f216800ce029953", "0x24173128a5a4927e5fc7a1defb2a2dcf180354128fc8f50f23445acab98807d5", "0x2fd735ae62eb284662c445841dbead6f4819ae81f2f15b35ba0abd93735c68d4", "0x80445c355075adf92526a2b739a5b1687a436a0b656bbde55c927b1c6473e417", "0xc42359bcfa63976b498770bba7bc47bd017ff61b789d511681efadc85796c988", "0x0fd91eef77b05531c1e09cf41dcfb78c59aa60148cf380bc050c69225aec0daf", "0xa9f9ba723686e292c567e4b8f56a0adf54acde6252c04bc319e68d23c95de646", "0xa49d467c972955cdf68e5042804ed4387309aef5855e2671a3ee18c662870b80", "0x34854f3176a058b451889a90667383af27e91a36519b2e07dd2c5725ee330283", "0x62b9101b5ee09082f9b824354102f41aeac3bb6d8f7ae6d46df5fe1cce85c5d1", "0x5a7b2064a1ae898fb8458fa9a3eac5ee80f06a4ecbc654c40ee3f4314f10ee34", "0xd6cc5a7daf58c114be77889b66f945f90d2d9988d30a913f3c956f13d1f0b811", "0xb162be49e1c617f7bffa7508c1c608fe67cf6f06baa741eb9dfcde5959aede6e", "0x0213a6292e0b295f2362f2e694bb0f1fb0b47e4ccfd19b1faa108d9ff910b3a5", "0xa51ff441a0707feae80594f7830ae0f034ef98fdb7383fcc79b4a5a45fedf5f0", "0x33e6be1de861c01021553a2264201e5d4e538ef0ce922d6c56815234a65333af", "0x7f800e80362574d48786a4e94288ef4c19f26ec5c4de83e1155c95378e8e7f99", "0xec2cce1e8c13840c172ce152034a8181307ea9abc0d6c8ca98d3e80044602a5e", "0x4cf6f353bcf0acf09cb9c670594c49499cc0467bddbf61f755c54a32eb06b013", "0xc3dab3b9f8ad5e10673f6f3edf2de699a7104a141be321c9f9d9fd0a05c13c9c", "0x1f3f77b169cf2de9364ddc72b54d9fad6014fff7b620c4794fa33f664a3ea458", "0x735ec6a4e768698d042cb46bf9cc7771c88fad89639c440cae5fef7adb552657", "0xbec4e8f68156c1ddf4db5727693a43fa407b76477203470d5838cfcc031b6b1d", "0x1abda8f8786142c2b399ab048c884f6ed549cdee3ed96c50224365952ce127c2", "0xb380ac5c316a2791bf3fc9639ca624dd568a207f25301b3f97e9a4f757114d44", "0xdba9891b9defe80b8c09a98fb5cf73d45978fd7bb9d2d651f796a2c5a0545e3b", "0xc5f8103d1dc0defd473d4e195b25c1f3fce5ed45c2a717dd00a148ea8ef6baea", "0xbe81229e698940a71cc9796d7c2e2042f69bc185ac87055030f64df28ab4c31b", "0xa85186cb602547ad3e6c66cc81dc75204b02973aa8c715362cd9ed5dd9e8cff4", "0x581ae8ac3ede171ebb74cf8991ca9677d40430cd492216664688acc9d23e5da5", "0xc920cc0f8dd182b0298e951b6b89423a7ab098dc5026672c807066d801f5c12b", "0xfd30d1d67c210f5e33f910ebc3cad7a43c969319418fbd35214dc366ee206cca", "0x439ee40224e81e3b895e3f6b9149c8d00a747be93f2a19526efb505ee8f22c48", "0x1d22ab1dbd6e6562890a284c5d5c724ac7453bd58b98a0da277c8c7a9a29c00e", "0x16911f7a8cdb1f5ca3561470dc5114bb9f04297f166c6d09939cf0080dbf4a1c", "0x53b02978fb1d6f9ff1101442c6f7c5c2f7dc19ab4557e5a9e056dbea8e7ab46f", "0x7ef0c54a4a6a3fb01603941875c2cc6d8996be7f2fa0f65eaa465aaff1e96545", "0x8adbedb58960a09a4d14c702ae2e553ff5dc35b7d658b93368ced824980253e5", "0x037aad1a2c0899756ce65e8cd969394d0f9231c2b8214392138d1d1960e11eaf", "0x56fadf8ee0aa1c80b040dd017970d7e5be9870107dc60261b1005c6b85a00f4f", "0x534e60e23a9076b7be49339ffecb3a5f9ec45cc403610126dae322de485a6edc", "0x44286d6dcdf86dede5ac76a40fe0f7eaaeb7dfe42312a40f7286693c0c314488", "0xe49b03d2af875c9ae6434b5d833bd970406e8556fe5bab89c277d59ab6546acb", "0x8b224b081907ad0dacac10fbd24d3bcce09181fa138e22f1c9a5c46f8468a417", "0x40ffc7df8b3b46bbb3a6f4d430c0d03e2412c5c4e54d9bfa966a04b448ef0960", 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"0x89f8b3b47c1d492dc7816f120349cfd2a6acf423d1f90baf97d34094f41a6a41", "0x41f40f7c0c4a630af0d821c735bfdf2e46d474f33d4df59472b75732fb04bee4", "0x0b4dd2cf8e51581f36f58af0df98aa981f5f33357d9d6ac1863d96d6f5e01923", "0x8c3c4e4c6f81f521e02db4b5e37194d174cae1b3eed5c54c63fba28efa44ebba", "0xe06d3cbb743e9a1af054380abff0e6d72612cbd7f9168fe14bb8a60753bed8c9", "0x99707d3181f621d356a9b816ab17cf6c4f29aec52dd007bcb86a32672dfef1bf", "0x103084fb17fe808d25af2583bdb6e8b1c6957f214c50d7a473f47c7db78b8d35", "0x79c4930cb4475a3e461c3a8695e38f2e4fcb46016ba483f8bfadc3d26299a732", "0x43fca669faf6ae3b8c46220516fa59c01df07e15ba5457dce06559c25c266f86", "0x91794b5b56e7273ac8fa1e2555978e3cc9fc1dd243bcaebd78b1d682056b2492", "0xd27c01c33c32023d54e519009c6359e19bf9ab4f26c643751165cbbea5475500", "0xe5b9c094f76344b2c240545371b1f06dd9d2305b7d9a9ff5f5ec39b02812a57f", "0xa5a87b10b5f709380ae726e1c39b47b90f77ad1c282f2ff8a73f7e0bf5d05ed5", "0xbad87a562fd44d32054356e5a6ac669fbe6d39903ad8e7a2cc1458b6f067ec1b", "0xbb27033b7f18e0e27d2572075d16c1d1633450c6563f6dddad2eb3c948e27ff6", "0xb28adb33431d5c30c782b05c353c7b5b3108c92143b76672963635ab933d5fcd", "0xf92cc38466f0cbcc5c5dd1cda3e90d5b34c9d14bcafd2bbb546b55878e361360", "0x6f44421d837532b46f734c912fe1e65ef5646fc3d5285d4c17e74962c3633704", "0xcfe69c501b2b9558674a2214bdc2380a80ca1ecbb9f6eac4117e7fb00c44d07e", "0x14beeb9391de7dafe29deb1b0107251f364f53a7cb74a52879b48a6a2ce73dc7", "0x4104e922db8f5b6c08d850c8fcf7122e83a1e467ee537bb414c723ab4fde98a8", "0x2f70ca660e5e459de0d063275484c03e731b2e94e979932aec1a6cb28b8fa31c", "0x0a1ad91fd451b6aa0cdce710b9aba62e2b31582751406fa0548a6e7b308b0b24", "0xf30618b099695afc6806eff1aaee45cccbf22eb78ef80362666414e7483c4651", "0xd65b3f38d60729978e75e5adc756abd4d7324b25cc84df949e028c9603cae873", "0x04520516103fae3a21054d691c236c6e2c78dbb3fac3666356fd21b58a3bd0bf", "0x92b9883459919a14628c880f87d7752e4092c332bfc4a722a533a9a5481bf4d4", "0xeeb5ba6e358e50408822aec9997ab23c0e41f3626a6077e12fea0b1f408fced3", "0x9c3a15491c3d3d57ba32dfb010387f8cdcd2bd41152ebc2e7a7fbaee4d7ad81c", "0x19e2b35db97c2a9dc3d87b195fd7f053a4dfb68dbfcbcf99b7d912cf86e83225", "0x8db98724e6bbe46008584be0f2f656df98a3b32c31ab2b566eaf34e43b66621e", "0xad830a057c4be36c5326b972c359ee068f406544e304e46a33f4cbb294db0942", "0x7769ff134203a93d101de33353df263f9608f6502c6823f4368e1797bcd94101", "0x8203c1056ef77da5e2d30aa4ec9ed9c2e1ff2fbdea85ca86930d7cfd21a1142b", "0x91a037ba9aa3b368fae0d1545fd494f7072dae04d98d8895400f372175e15969", "0xb9409955dd15fe0dc2fa0c48bfaba816da124ddc3625c4585e265f8a96f9ac7a", "0xc8b8cec3fb7de9117bf3c8bacb8ae73cb90780252414802773704dc3c1becc24", "0x17b62bdad0bf831d6a8f30eb18e343db0c20a79c1c6cf4dd708b7bf01a04dc05", "0x4d95b9f906e9e0e0aeb6f538fc45a2a0d8a75fce6fdfa1e023f41df9a6a1c432", "0xaded3f6434e5c6107264d3cd798f2095f419d0e9cee916fd7751eb09f50e7a48", "0xea1acc7066307f02347a490b2209e57c92ac07916a10c94dd50bc4401c97de1b", "0x4336c85eed91bec83cd25916d8f41d0dfe1eef3513748d9463ae4fa0c0ef842b", "0x5207e73af454781329540e8b3b2a29b6932418e6cad9e408ad19eaae5ab0c0f5", "0xe652a2db40702b203a6f7b7aae0ebe2c090d41eca946fdb60d292d556b93b892", "0x5d617dbff2c7d49e48ff2ced5518a7424061d8acfcb74d5f21a209602d59b44c", "0x0b9f3f91b6e58a417cf680e323077913d3a730118613e2b9dad47f8d245e34df", "0xdf03d8d427903fb8b069039b3548c6a67c26247d10640b12d61a2226d1d0740e", "0x475112a6ded14acee911445c5f737b14cf2c43601f4f4ef3ab169efa7afc4257", "0xd94db5a38591163d5f56b95375f8efedcb685a56653e7623e3b7b80a2cc655e9", "0xf1ccb01761bc9592dd53b7f49164988da5bbdbf2322e4778a21d53fb0e445d8e", "0xd9353302194e1d53f1202c1c4f068f3988eb9ce6dfc2266fd4b9f6441abe84d2", "0x35013749fd06190da2edd633084497a990fd647c94baea04bdaa111d4da52c63", "0x4a16a07de7ce7ba0b92c3f3b439a68c8e0f691c9d3f17adaad793b2e865bdde4", "0x592c8f6d64dac7431bddd0142832c5963aef27dcc886d25b38c2c791821eacfa", "0x10bbd6fcbd66c510e11887367154f36638bfa0c8be04a87412b08e65d92c3997", "0xcfa688f8908205455227ac9eafecbd60c79b84daff4ca9c895579168b6a1629d", "0x53e57fde06ba8b4e5f555d35a0e76246ec59cd797424fce14b2d0b771df61253", "0x21a5e8ec85492fae2756a5e5453191ccebdd91982d239a095112a43582952e67", "0xeae2f33689e4e06eb4a1c4eb608526632b0aee73ba3f0fb6b6f5b4777f531a91", "0x2c9197b3e02bda6d2bfcbcc216643b4a329e7786c5761068d325a3e647692e08", "0xdc1742f7f8d45e27bc28212d433ca377c25c3e5dcad2ffb9cc48ca5df5b530b1", "0x99f0aad726e1bd463952f2a371c1022316d66e5ba90f48b619514a75d3c7906f", "0xc70ffa4688f3e507dce5457826c2092882e5d2e78bca5deafb9f415bdb8bb06f", "0x9c4e6882d8e8028c27a2cbb94decc07213acd015aeed25f69abde8ccda1c9ea5", "0x86022583a691631ff2592e6baaf47ef21dd73044e15ca1a3c473b4323b12d4be", "0x8494f3bf944e6bffacaeeec996ce9a073e1d7cf7fed734574fa268d4d19787d2", "0xfda7c76c7dc13b4c64f70f0780b1f063beff219954dd3f178dbb546e854750ed", "0xc270bd467a44e453befce74fdf41c9ec8622789b8bfd85a6bf6f2de0ff0b3abb", "0xbcf4106d57b04d540e54998d6cbabc1fa901babd36315f9a6d34d93209bb3821", "0xb7f72a1fcf79bed8430f335d3a163f635bce029b46552b5006fc1c5bfaec267a", "0xc6ac5015de26e8a3ac23cf4a82c76acb923beb3c2057e53e8855aad0afbca04d", "0x44500e44179689571515e03f11314f268eefe8319848b686a07c200e04aae0cf", "0x3a4ecd58dbd2a7f6701bd17e520e76db694e7bb8564e53f89c211406fb1ad7f3", "0x140502f4fc6b022d35f77a7b0143d955ed015996afe846c54f0efb820e34c131", "0x8e3b662aeb4685b57570a8c2c0356ded13a36327f0e12872cbeadeb8cb60ff60", "0xedbd164fb4839a319acd5f1d73a114e809d7b618d2b06803993daa9446051ed3", "0xccb5c91e3618c085ad7b800f7ef79a8c0bc5554980a98bc2b224e41dd77eb44d", "0x96538baa49e1d2bdf14678b1e3476342120a80168583ba4f9ed8ce058daf5c34", "0x93660d48b4e99da6572d4a4e84cead65a2555ad640b7e76522b4bb615ccc6b84", "0x3f552848e0bcd430e960d34d6cabccdda392c9413a15aebf52b4cb0c6dd7cb1f", "0xc082028283910a0e36766bae28382649e1041ca6747f4cc1110c2be7fee135a9", "0xd60d910dbd5eec60e1e11038571ab4f4ed4df43d45f10751ba879e8fa8ab0794", "0xa1a705eed777756d85f0d839f6cdf7fdc6d0cadef343f410a3634d358c6441eb", "0x510ed3bf8002dbd082ad1461438f21797954f7ca26af5b0a3492f73e4fcbdf12", "0x6fec4a391035dae7f5751b838866a703cee4cb6c59de3400a4d53c9b5b27bfbe", "0xfccd2b58710a890f3ebcf862d33b47a3ade5f198d45165e824bb38ce4bc439db", "0x075609c0997d9d54ff9541e593e0aac3afe4cd1ac8e804622a7c56fb38c04416", "0xe2894e4f474644d5e19a03538f02fbc622ef0817c88eb7859fb0e2a1c1fae783", "0xa72039fc55627449c941e85f7e54a7e3e931153ebbb9414387ce8938396cedc9", "0x23c5f19d028ee2997a445c5cbeec7b28ede160dba6a797f967912ab0de7e8e68", "0x16981054922c77a0c803efd0c67cf639fe85779734057bf8146c4b07205c87c2", "0xa930051564e3487b213a375e155213b416e298eab3578a2b4ba6f57059e841ed", "0x03d90d7f9fd1b839a692ccae79d0020164c51a1e85dfb859858c053b6ce83fc9", "0xee877c931d4dac93a02b9861512592cb05f5496c7c2943f40681d2c27792521b", "0xfbbe9a112d21b5fbdd11fe558cf6e4a5096a68b8003d1c7130976f0161b18267", "0x63a85ac9582d67bc56c999b13435e898e2785794792cc5f3bb17c6ad6dc3eb67", "0x4f60b25143c25af066cb916e4f4d490eb29b4ed61fde43c16639fb0620045818", "0x8f51d8f5b5fbcc1860db4971e438687d37ba07d5badaefed492939506ec0fbd8", "0x4fb7d6e712759a6f29af598c11f510a6af72c9c45592dd10fc0757ebe4f07001", "0x05b33cc297baf5b5634cf4aff5d2ef3af17914c875d05da1c7966862ca191353", "0x7abd9cfffdc5f0c15e211de2c29bc6a4f2f66f701249a27b33e2dd790758b6b9", "0x94c6b46f230107312cc4df6a642fa5b53ba4fc313d79d660fba2fdcd0ffc54c6", "0xa09bd814978d4de6423e3c71cdc3acd16304c9c663f965f36a268cb6c4f926bf", "0xf5ea9e52791efe21aa9a1745c1a5c717b39c820583b7443a95deffa158206b2d", "0x003a0c07aec72ac501dbce37b22b643cf7846e3f1bf11d8028d8a1c3c6f636d4", "0xab51aa4e5ac78f48788940d22164885bd6adee95c0fcb3c91d494735c7f2986b", "0x620c52dd56ffb393d33ba4c4375d8ef047299d85be87216c33462c4f379f9af1", "0x64ebe5dceea7a3ca3759a5503cf62703605b03af982bd7d0a33762bb52c430bf", "0xd4fa2b38a3278df22f86e75db41b72ff45d6e7be941a9d07b92c8dcb2d960cf7", "0x7828143c8b51054cf3c811b930be93ec28c599b73028e9bb00d3a85531d59e4b", "0xcb2a90ed5e330fcadff7f0c905c4f3b7ddbad020d467735976f64d18d07e8a32", "0xab9fddeb3cef4bd468a1186d13d5987ccbf20e2cd272578e3cc85ee22116524f", "0xa1de8cc2291e93fb2897f508e53dfaa45b079773e710a7431502939a1912cba9", "0x388450f8aeef3acede8afda896ad24fa7ba5bfc83dfa0caa9c0cca2ea52e41f0", "0xe7fe9ff76d8c258c2b08dbd194d33625f6f22b6329f694ed1aee06a94fefe514", "0x6598b4bff10ad16b2b7189c8c10eca870b6ee8a4e08f4c561439a98d170b3361", "0x07255e29017ff2ab22a818edd43ade74c9ccc26d2f8f23fee2f6f0e41af040fe", "0x94c8012f83e80b114ffd20ef61faf4b321ea1ed099e77e0eb64886eb996fc026", "0x6be71d92bb8dd619e83405e2d7631a92638004282428c34aec26890ecccdd16b", "0x95e8ee835e5ee30ea57fc4d01c1f059b85db5b745dabf5b2d42e290a3226fb4a", "0x45e8a3d5f068a346942324c49f3d6a1775b58aa2057054f3cc43111c53e0557e", "0x4f5af02595851441f19e268254924c5edec466224b327b20758c08b8f427bdc5", "0xee06136bc4e83e611cf60a9c4dd4cc2f8833782549f5d7578ffea2d71ad28cc9", "0xefe4a4a67e744e8e154c3394eeb1acc513001a16cd155c880d426f0fd9eecab1", "0x236d6c7df3b39739763987c55433e471c7cfc64c0bed3fbba0f9bd81ce411815", "0x7e3b36ff3eba7f72d40890dff123b1eecb20511320a3a029a069377865d8fb32"],
  transactionsRoot: "0x48e4192725d1708f2934e9d0ac65338291010fe97b2e860d080c4a56ba3e5505",
  uncles: []
}
>

 

최신블록에 저장된 첫번째 트랜잭션

- 트랜잭션 수준까지 드릴다운 가능

eth.getTransactionFromBlock(latestBlockNum,0)

> eth.getTransactionFromBlock(latestBlockNum,0)
{
  accessList: [{
      address: "0x1c98562a2fab5af19d8fb3291a36ac3c618835d9",
      storageKeys: ["0x9c04773acff4c5c42718bd0120c72761f458e43068a3961eb935577d1ed4effb", "0x0000000000000000000000000000000000000000000000000000000000000008", "0x0000000000000000000000000000000000000000000000000000000000000000", "0x0000000000000000000000000000000000000000000000000000000000000004", "0x0000000000000000000000000000000000000000000000000000000000000002"]
  }, {
      address: "0x9e32b13ce7f2e80a01932b42553652e053d6ed8e",
      storageKeys: ["0x7783e0979ae10dc9a52376541aa862a6ece32c7c19d42600912da6f689efc293", "0x2930bff2861f48c2c394f3961cdc3d091643d9f8f0d37ee64185688b39d2f1e2"]
  }, {
      address: "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
      storageKeys: ["0x97396b6b99745726caa6c49125ad6a29a6e463aab929d4551c71908db42469e2", "0xd58e5a49d62721749ea980e6000ede56e6369aceccaf9ee83302e53b5b662ae8"]
  }],
  blockHash: "0xe4a57fc4603bee2a310ecb85b932863714fcfda7daab5d5350f0714faf99dfca",
  blockNumber: 14178069,
  chainId: "0x1",
  from: "0x03bfbd24d32aa20bb524be8de24040feaa9dfca1",
  gas: 500990,
  gasPrice: 51288944400,
  hash: "0xf71ccbdc0769fbd1468f7270ec28c78eb88c4e08c4768f1b89359546af223174",
  input: "0xd85715000bb80000000000000202ab632ca4fc8824001867c44e9e2786811c98562a2fab5af19d8fb3291a36ac3c618835d99e32b13ce7f2e80a01932b42553652e053d6ed8e",
  maxFeePerGas: 51288944400,
  maxPriorityFeePerGas: 0,
  nonce: 25291,
  r: "0xd9b925a210561af25cdd1d030cfc00149c129d97a7e2a6c0fa2c530022cbb207",
  s: "0x118442d9313bf3269642d12cf9070ae800c46ee32f281dea564fb2cea3d7a5dd",
  to: "0x49307d775728daf1d4736ab762de0cefd035e323",
  transactionIndex: 0,
  type: "0x2",
  v: "0x0",
  value: 0
}
>

 

eth 객체 확인

eth

> eth
{
  accounts: [],
  blockNumber: 14178231,
  coinbase: undefined,
  compile: {
    lll: function(),
    serpent: function(),
    solidity: function()
  },
  defaultAccount: undefined,
  defaultBlock: "latest",
  gasPrice: 33803372430,
  hashrate: 0,
  maxPriorityFeePerGas: 1000000000,
  mining: false,
  pendingTransactions: [],
  protocolVersion: undefined,
  syncing: false,
  call: function(),
  chainId: function(),
  contract: function(abi),
  createAccessList: function(),
  estimateGas: function(),
  feeHistory: function(),
  fillTransaction: function(),
  filter: function(options, callback, filterCreationErrorCallback),
  getAccounts: function(callback),
  getBalance: function(),
  getBlock: function(),
  getBlockByHash: function(),
  getBlockByNumber: function(),
  getBlockNumber: function(callback),
  getBlockTransactionCount: function(),
  getBlockUncleCount: function(),
  getCode: function(),
  getCoinbase: function(callback),
  getCompilers: function(),
  getGasPrice: function(callback),
  getHashrate: function(callback),
  getHeaderByHash: function(),
  getHeaderByNumber: function(),
  getMaxPriorityFeePerGas: function(callback),
  getMining: function(callback),
  getPendingTransactions: function(callback),
  getProof: function(),
  getProtocolVersion: function(callback),
  getRawTransaction: function(),
  getRawTransactionFromBlock: function(),
  getStorageAt: function(),
  getSyncing: function(callback),
  getTransaction: function(),
  getTransactionCount: function(),
  getTransactionFromBlock: function(),
  getTransactionReceipt: function(),
  getUncle: function(),
  getWork: function(),
  iban: function(iban),
  icapNamereg: function(),
  isSyncing: function(callback),
  namereg: function(),
  resend: function(),
  sendIBANTransaction: function bound transfer(),
  sendRawTransaction: function(),
  sendTransaction: function(),
  sign: function(),
  signTransaction: function(),
  submitTransaction: function(),
  submitWork: function()
}
>

 

이더단위변환

Web3 API는 이더를 Wei로, Weif를 이더로 변환할 수 있는 기능을 제공.

 

Wei 금액을 특정 단위로 변환

web3.fromWei(금액,단위)

> var amountInWei = 12000000
undefined
> var amountInSzabo = web3.fromWei(amountInWei,'szabo')
undefined
> console.log(amountInWei + ' WEi is equivalent to ' + amountInSzabo + 'szabo')
12000000 WEi is equivalent to 0.000012szabo

 

다른 단위를 Wei로 변환

web3.toWei(금액,단위)

> var amountInEther = 12
undefined
> var amountInWei = web3.toWei(amountInEther, 'Ether')
undefined
> console.log(amountInEther + ' Ether is equivalent to ' + amountInWei + 'Wei')
12 Ether is equivalent to 12000000000000000000Wei