iota.lib.js/examples/multisig.js

Javascript Library for IOTA

var IOTA = require('../lib/iota');

var iota = new IOTA({
    'host': 'http://localhost',
    'port': 14700
});

// First co-signer uses index 0 and security level 3
var digestOne = iota.multisig.getDigest('ABCDFG', 0, 3);

// Second cosigner also uses index 0 and security level 3 for the private key
var digestTwo = iota.multisig.getDigest('FDSAG', 0, 3);

// Multisig address constructor
var Address = iota.multisig.address;

// Initiate the multisig address generation
var address = new Address()

    // Absorb the first cosigners key digest
    .absorb(digestOne)

    // Absorb the second cosigners key digest
    .absorb(digestTwo)

    //and finally we finalize the address itself
    .finalize();


console.log("MULTISIG ADDRESS: ", address);

// Simple validation if the multisig was created correctly
// Can be called by each cosigner independently
var isValid = iota.multisig.validateAddress(address, [digestOne, digestTwo]);

console.log("IS VALID MULTISIG ADDRESS:", isValid);


//  SIGNING EXAMPLE
//
//  Even though these functions are called subsequently, the addSignature functions have to be called by each
//  cosigner independently. With the previous signer sharing the output (bundle with the transaction objects)
//
//  When it comes to defining the remainder address, you have to generate that address before making a transfer
//  Important to know here is the total sum of the security levels used by the cosigners.

// Transfers object
var multisigTransfer = [
  {
    address: iota.utils.noChecksum('ZGHXPZYDKXPEOSQTAQOIXEEI9K9YKFKCWKYYTYAUWXK9QZAVMJXWAIZABOXHHNNBJIEBEUQRTBWGLYMTX'),
    value: 999,
    message: '',
    tag: '9'.repeat(27)
  }
];

// Multisig address object, used as input
var input = {
  address: address,
  securitySum: 6,
  balance: 1000
}

// Define remainder address
var remainderAddress = iota.utils.noChecksum('NZRALDYNVGJWUVLKDWFKJVNYLWQGCWYCURJIIZRLJIKSAIVZSGEYKTZRDBGJLOA9AWYJQB9IPWRAKUC9FBDRZJZXZG');

iota.multisig.initiateTransfer(input, remainderAddress, multisigTransfer, function(e, initiatedBundle) {

    if (e) {
        console.log(e);
    }

    iota.multisig.addSignature(initiatedBundle, address, iota.multisig.getKey('ABCDFG', 0, 3), function(e,firstSignedBundle) {

        if (e) {
            console.log(e);
        }

        iota.multisig.addSignature(firstSignedBundle, address, iota.multisig.getKey('FDSAG', 0, 3), function(e,finalBundle) {

            if (!e) {
                console.log("IS VALID SIGNATURE: ", iota.utils.validateSignatures(finalBundle, address));
            }
        });
    });

})