Cryptography

Wallet

The wallet data is stored inside a KeyStore

AES-256-GCM for symmetric encryption

Argon2.IDkey as Key Derivation Function

• time: 1

• memory: 64 * 1024

• threads: 4

• key_length: 32

An encrypted KeyStore is referred to as KeyVault.

KeyVault Example

{
  "baseAddress":"z1qqjnwjjpnue8xmmpanz6csze6tcmtzzdtfsww7",
  "crypto":{
    "argon2Params": {
      "salt":"0x1563f86f7afa59dd0be150ffeac10896"
    },
    "cipherData":"0xe81dbb96f5b9839f3741ceff8362e1ebf09e05a8311354658ddf979577ffd0dd34df55757d1fd37e677e3ae7d055b2ed",
    "cipherName":"aes-256-gcm",
    "kdf":"argon2.IDKey",
    "nonce":"0xb7cc39120d5b87a3b7af58b7"
  },
  "timestamp":1633548746,
  "version":1
}

Digital Signing Algorithm

Ed25519 is a deterministic signature scheme using curve25519

Key Derivation

Ed25519 which is compatible with BIP44

• key parameter: ed25519 seed

• hardened offset: 0x80000000

BIP44 Format

m / purpose' / coin_type' / account' / change / address_index

Alphanet (Network of Momentum Phase 0) uses coin_type value 73404

Alphanet Address Format

bech32

• human readable part: z

data

• user account prefix byte: 0

• embedded contract prefix byte: 1

• core: first 19 bytes of sha3(pubKey)

address: bech32(hrp, data)

Example

Entropy

bc827d0a00a72354dce4c44a59485288500b49382f9ba88a016351787b7b15ca

Mnemonic

route become dream access impulse price inform obtain engage ski believe awful absent pig thing vibrant possible exotic flee pepper marble rural fire fancy

BIP44 Path

m/44'/73404'/0'

Private Key

d6b01f96b566d7df9b5b53b1971e4baeb74cc64167a9843f82d04b2194ca4863

Public Key

3e13d7238d0e768a567dce84b54915f2323f2dcd0ef9a716d9c61abed631ba10

User Prefix Byte

00

Core Bytes

25374a419f32736f61ecc5ac4059d2f1b5884d

Address

z1qqjnwjjpnue8xmmpanz6csze6tcmtzzdtfsww7

Zenon Dart SDK Example

Code

import 'package:hex/hex.dart';
import 'package:znn_sdk_dart/znn_sdk_dart.dart';

Future<void> main() async {
  final mnemonic =
      'route become dream access impulse price inform obtain engage ski believe awful absent pig thing vibrant possible exotic flee pepper marble rural fire fancy';

  var keyStore = KeyStore.fromMnemonic(mnemonic);
  var keyPair = keyStore.getKeyPair(0);
  var privateKey = keyPair.getPrivateKey();
  var publicKey = await keyPair.getPublicKey();
  var address = await keyPair.address;

  print('Entropy: \n${keyStore.entropy}\n');
  print('Mnemonic: \n${keyStore.mnemonic}\n');
  print('BIP44 path: \n${Derivation.getDerivationAccount(0)}\n');
  print('Private key: \n${HEX.encode(privateKey!)}\n');
  print('Public key: \n${HEX.encode(publicKey!)}\n');
  print('User & Core bytes: \n${HEX.encode(address!.core!)}\n');
  print('Address: \n$address');
}

Output

Entropy:
bc827d0a00a72354dce4c44a59485288500b49382f9ba88a016351787b7b15ca

Mnemonic:
route become dream access impulse price inform obtain engage ski believe awful absent pig thing vibrant possible exotic flee pepper marble rural fire fancy

BIP44 path:
m/44'/73404'/0'

Private key:
d6b01f96b566d7df9b5b53b1971e4baeb74cc64167a9843f82d04b2194ca4863

Public key:
3e13d7238d0e768a567dce84b54915f2323f2dcd0ef9a716d9c61abed631ba10

User & Core bytes:
0025374a419f32736f61ecc5ac4059d2f1b5884d

Address:
z1qqjnwjjpnue8xmmpanz6csze6tcmtzzdtfsww7