SYNOPSIS

or #ethereumjs on freenode

A module to store and interact with blocks.

INSTALL

npm install ethereumjs-blockchain

API

./docs/

EXAMPLE

The following is an example to iterate through an existing Geth DB (needs level to be installed separately).

This module performs write operations. Making a backup of your data before trying it is recommended. Otherwise, you can end up with a compromised DB state.

const level = require('level')
const Blockchain = require('ethereumjs-blockchain').default
const utils = require('ethereumjs-util')

const gethDbPath = './chaindata' // Add your own path here. It will get modified, see remarks.
const db = level(gethDbPath)

new Blockchain({ db: db }).iterator(
  'i',
  (block, reorg, cb) => {
    const blockNumber = utils.bufferToInt(block.header.number)
    const blockHash = block.hash().toString('hex')
    console.log(`BLOCK ${blockNumber}: ${blockHash}`)
    cb()
  },
  err => console.log(err || 'Done.'),
)

WARNING: Since ethereumjs-blockchain is also doing write operations on the DB for safety reasons only run this on a copy of your database, otherwise this might lead to a compromised DB state.