Beginners guide to Ethereum (5) — Manage information of your blockchain & what is inside a block

Overview

Start coding!

{"config":{},"gasLimit": "2000000000","difficulty": "10","alloc": {}}
geth init genesis.json --datadir higeth --networkid 123 --datadir hi
geth attach /Users/tina/hi/geth.ipc  //replace the highlighted part with your ipc address
for(var i=0;i<2;i++) personal.newAccount('')accounts = eth.accountspersonal.unlockAccount(accounts[0], '')miner.start() //get some funds in your coinbase address to execute transactions//wait a few seconds for miningeth.sendTransaction({from: accounts[0], to: accounts[1], value: 100}) 
eth.sendTransaction({from: accounts[0], to: accounts[1], value: 300})
//wait a few seconds for miningminer.stop()
touch test.js
data = []; // An array storing all transaction blocks detailsjson = {}; // the final output we want totalCost = 0; // total gas cost in Wei(a unit)for(var i=1;i<=web3.eth.getBlock("latest").number;i++) {    web3.eth.getBlock(i, function(error, result){        data.push.apply(data, result.transactions); // merge the result.transaction array into the "data" array(It's an array because there may be multiple transactions in one block)    });}json.length = data.length;json.blockInfo =[];for(var i=0;i<data.length;i++){    block = eth.getTransaction(data[i]);    json.blockInfo.push(block);    totalCost += block.gasPrice * web3.eth.estimateGas({from: block.from, to: block.to});}json.totalCostInEther = web3.fromWei(totalCost, 'ether');
loadScript('/Users/tina/Desktop/test.js') // replace this with your file path
json 
{blockInfo: [{blockHash: "0x2d42f2cdaeceb1a46d349c6bcdcb8fb93654444e6bb3c98aa53b147f542f5aaa",blockNumber: 8,from: "0x47f011ee8dee42f52ff2c1bd9990421e2db30af4",gas: 90000,gasPrice: 18000000000,hash: "0x4624057c4c1b3add9cf86c7c7132fbd6e9cf550b4d068019987799892d52712b",input: "0x",nonce: 0,r: "0x510fb16aa71dd9643c81f2af9b7c08f8c28edb2ca0ef366672ef4994aa06944e",s: "0x59f9653d526e13923fc190cbcf864689c428f4b9fcec9d768b48cca237c1fdfe",to: "0xc6da0e6b73866997073f4ba9e2203717c129baab",transactionIndex: 0,v: "0x1b",value: 100 // the money in Wei you sent from accounts[0] to accounts[1]}, {blockHash: "0x2d42f2cdaeceb1a46d349c6bcdcb8fb93654444e6bb3c98aa53b147f542f5aaa",blockNumber: 8,from: "0x47f011ee8dee42f52ff2c1bd9990421e2db30af4",gas: 90000,gasPrice: 18000000000,hash: "0x8f7f1e4fa9ffe84794d20b0d9d20571b51cc70c25a428c7e2c00c4d4c3a7f610",input: "0x",nonce: 1,r: "0x30469d1dc3eb9e4a3e857537c59e56ae19b34cdffce78fc7abaa24da4429d43f",s: "0x52909d07d25653a8f416db76c306b84328842953c5a9ef9aff0c678e6ebb787d",to: "0xc6da0e6b73866997073f4ba9e2203717c129baab",transactionIndex: 1,v: "0x1c",value: 300}],length: 2,totalCostInEther: "0.000756036"}

Wrap up

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Founder of Z Institute | Researcher @ Evernew Cap | Berkeley Blockchain Lab | HKUST | NTU | Model (instagram.com/tinaaaaalee) | Projects: github.com/tina1998612

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李婷婷 Lee Ting Ting

李婷婷 Lee Ting Ting

5.7K Followers

Founder of Z Institute | Researcher @ Evernew Cap | Berkeley Blockchain Lab | HKUST | NTU | Model (instagram.com/tinaaaaalee) | Projects: github.com/tina1998612