multiverse-blockchain

Multiverse Blockchain

Simple blockchain in JS.

Usage

const { Chain } = require('multiverse-blockchain')

const chain = new Chain()
const d1 = {type: 'data 1'}
const d2 = {type: 'data 2'}
chain.add(d1).add(d2)

chain.length // 2
chain.integrity() // true
chain.stringify() // W3sidHMiOjE2MTQyNTM1NjU0NDEsImRhdGEiOnsidHlwZSI6ImRhdGEgMSJ9LCJ===
chain.pop() // Error "you can't break the blockchain calling pop"

Create a new instance of a Chain. You can pass a base64 encoded string that is the output of chain.stringify() to new Chain(base64string) and instantiate a chain with data (for example from a datastore). chain extends the Array class so you can treat it like an array, but some array functions that would mutate the array (like pop and shift) will error. You can verify the integrity of the blockchain, this function will check each block matches is own hash, and that each of the hashes in the chain match from block to block. You can add any valid JSON object to your blockchain using chain.add(data)

chain[0]
/**
    Block {
        ts: 1614253657703,
        data: { val: 200 },
        phash: '19fc1e5a4b1731933ba1093dd7dc4aea7afec10e036261abd243d28492200134',
        hash: '2fafb10b4e9a5bad46660de310c907a66a84951858554c1fe6718ce21135360a'
    }
*/
chain.reduce((sum, block) => {
    return sum + block.data.val
}, 0)
/**
    200
*/

phash is the hash of the previous block. Because the chain is an Array object you can perform any of the non-mutating array functions; map, filter, reduce, sort.