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blockchain.ts
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blockchain.ts
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const sha256 = require('js-sha256')
import Block from './block';
import Transaction from './transaction'
export default class Blockchain {
blocks: Block[];
constructor (genesisBlock: Block) {
this.blocks = []
this.addBlock(genesisBlock)
}
addBlock(block: Block){
if(this.blocks.length == 0) {
block.previousHash = "0000000000000000" // 16 ceros va a ser el Hash Previo
block.hash = this.generateHash(block)
}
this.blocks.push(block)
}
getNextBlock(transaccions: Transaction[]) {
// Creo el nuevo bloque
const block = new Block()
transaccions.forEach( (transaccion) => {
block.addTransaction(transaccion)
})
// Necesito informacion del bloque anterior
const previousBlock = this.getPreviousBlock()
// Creamos el indice
block.index = this.blocks.length
// Obtenosmo el hash anterior
block.previousHash = previousBlock.hash
block.hash = this.generateHash(block)
return block
}
getPreviousBlock(){
return this.blocks[ this.blocks.length -1 ]
}
generateHash(block: Block) {
let hash = sha256(block.key)
// Pedimos que comience con 4 ceros
// para obtener el hash real
while(!hash.startsWith('0000')) {
block.nonce += 1
hash = sha256(block.key)
console.log(hash)
}
return hash
}
}
// module.exports = Blockchain
// export{}