SYNOPSIS

Implements Ethash.

INSTALL

npm install ethashjs

USAGE

const Ethash = require('ethashjs')
const Block = require('ethereumjs-block')
const levelup = require('levelup')
const memdown = require('memdown')

var cacheDB = levelup('', {
  db: memdown
})

var ethash = new Ethash(cacheDB)
var validblockRlp =
  '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'

var validblock = new Block(Buffer.from(validblockRlp, 'hex'))

ethash.verifyPOW(validblock, function (result) {
  console.log(result)
})

BROWSER

Yep, you can browserify it.

API

• new Ethash([cacheDB])
• ethash.verifyPOW(block, cb)
• ethash.mkcache(cacheSize, seed)
• ethash.run(val, nonce, fullsize)

new Ethash([cacheDB])

Creates a new instance of Ethash.

Parameters

• cacheDB - an instance of a levelup db which is used to store the cache(s)

ethash.verifyPOW(block, cb)

Verifies the POW on a block and its uncles

Parameters

• block - the block to verify
• cb - the callback which is given a Boolean determining the validaty of the block

ethash.mkcache(cacheSize, seed)

Creates a cache. NOTE: this is automatically done for in - ethash.verifyPOW(block, cb) so you do not need to use this function if you are just validating blocks

Parameters

• cachSize - the size of the cach
• seed - the seed as a Buffer

ethash.run(val, nonce, fullsize)

Runs ethash on a give val/nonce pair. NOTE: you need to run ethash.mkcache(cacheSize, seed) first before using this function.

Parameters

• val - value to run ethash on e.g. the header hash
• nonce - the nonce used for this hash attempt
• fullsize - the fullsize of the cache.

Returns

An Object containing:

• hash - the hash of the value
• mix - the mis result

TESTS

npm test

LICENSE

MPL-2.0