cardano-wallet-js
Advanced tools
Readme
cardano-wallet-js is a javascript/typescript SDK for Cardano with a several functionalities. You can use it as a client for the official cardano-wallet and also to create Native Tokens and NFTs.
The official cardano-wallet by IOHK exposes a REST api/CLI interface which allows clients to perform common tasks on the cardano-blockchain, such as:
Our project aims to provide an easy to use Javascript SDK for programmers, instead of exposing the raw REST structure to you.
Before start using the library you will need a cardano-wallet server running. If you have docker available you can just
download the docker-composer.yml they provide and start it using docker-compose:
wget https://raw.githubusercontent.com/input-output-hk/cardano-wallet/master/docker-compose.yml
NETWORK=testnet docker-compose up
NOTE: You can find more information about different options to start the cardano-wallet server here
Using npm:
npm i cardano-wallet-js
To begin, start with a WalletServer. It allows you to connect to some remote cardano-wallet service.
const { WalletServer } = require('cardano-wallet-js');
let walletServer = WalletServer.init('http://{your-server-host}:{port}/v2');
First you can try is getting some blockchain information like: (network parameters, information and clock)
Get network information
let information = await walletServer.getNetworkInformation();
console.log(information);
This will print out something like this:
{
"network_tip": {
"time": "2021-04-12T21:59:25Z",
"epoch_number": 125,
"absolute_slot_number": 23895549,
"slot_number": 265149
},
"node_era": "mary",
"node_tip": {
"height": {
"quantity": 0,
"unit": "block"
},
"time": "2019-07-24T20:20:16Z",
"epoch_number": 0,
"absolute_slot_number": 0,
"slot_number": 0
},
"sync_progress": {
"status": "syncing",
"progress": {
"quantity": 0,
"unit": "percent"
}
},
"next_epoch": {
"epoch_start_time": "2021-04-14T20:20:16Z",
"epoch_number": 126
}
}
Get network parameters
let parameters = await walletServer.getNetworkParameters();
console.log(parameters);
This will print out something like this:
{
"slot_length": {
"quantity": 1,
"unit": "second"
},
"decentralization_level": {
"quantity": 100,
"unit": "percent"
},
"genesis_block_hash": "96fceff972c2c06bd3bb5243c39215333be6d56aaf4823073dca31afe5038471",
"blockchain_start_time": "2019-07-24T20:20:16Z",
"desired_pool_number": 500,
"epoch_length": {
"quantity": 432000,
"unit": "slot"
},
"eras": {
"shelley": {
"epoch_start_time": "2020-07-28T20:20:16Z",
"epoch_number": 74
},
"mary": {
"epoch_start_time": "2021-02-03T20:20:16Z",
"epoch_number": 112
},
"byron": {
"epoch_start_time": "2019-07-24T20:20:16Z",
"epoch_number": 0
},
"allegra": {
"epoch_start_time": "2020-12-15T20:20:16Z",
"epoch_number": 102
}
},
"active_slot_coefficient": {
"quantity": 5,
"unit": "percent"
},
"security_parameter": {
"quantity": 2160,
"unit": "block"
},
"minimum_utxo_value": {
"quantity": 1000000,
"unit": "lovelace"
}
}
Get network clock
let clock = await walletServer.getNetworkClock();
console.log(clock);
This will print out something like this:
{
"status": "available",
"offset": {
"quantity": 405623,
"unit": "microsecond"
}
}
The recovery phrase generation relies on bip39.
const { Seed } = require('cardano-wallet-js');
// generate a recovery phrase of 15 words (default)
let recoveryPhrase = Seed.generateRecoveryPhrase();
console.log(recoveryPhrase);
Output:
> "hip dust material keen buddy fresh thank program stool ill regret honey multiply venture imitate"
IMPORTANT: The recovery phrase is the only way you can restore you wallet and you SHOULD KEEP IT SECURE AND PRIVATE. You'll get a completeley different recovery phrase each time you execute the method.
For convenience, you can convert the recovery phrase into an array using this:
let words = Seed.toMnemonicList(recoveryPhrase);
console.log(words);
Output:
> ['hip', 'dust', 'material', 'keen', 'buddy', 'fresh', 'thank', 'program', 'stool', 'ill', 'regret', 'honey', 'multiply', 'venture', 'imitate']
In this example we are going to create a new wallet. Have in mind that the method createOrRestoreShelleyWallet creates a new wallet if it doesn't exist or restore an existent wallet:
const { Seed, WalletServer } = require('cardano-wallet-js');
let walletServer = WalletServer.init('http://you.server.com');
let recoveryPhrase = Seed.generateRecoveryPhrase();
let mnemonic_sentence = Seed.toMnemonicList(recoveryPhrase);
let passphrase = 'tangocrypto';
let name = 'tangocrypto-wallet';
let wallet = await walletServer.createOrRestoreShelleyWallet(name, mnemonic_sentence, passphrase);
IMPORTANT
cardano-wallet-js creates an abstraction layer for cardano-wallet. Therefore the address discovery is handled by 'cardano-wallet' using BIP-44 standard. Thus you have to consider that the address gap limit is 20, which means that if the wallet hits 20 unused addresses in a row, it expects no used addresses beyond this point and stops searching the address chain. That means that funds received on addresses with a gap greater than 20 WILL NOT APPEAR ON THE WALLET BALANCE.
List wallets:
let wallets = await walletServer.wallets();
Get wallet by Id:
let wallets = await walletServer.wallets();
let id = wallets[0].id;
let wallet = await walletServer.getShelleyWallet(id);
Get wallet's utxo statistics:
let statistics = await wallet.getUtxoStatistics();
Statistics will contain the UTxOs distribution across the whole wallet, in the form of a histogram similar to the one below.
│
100 ─
│
│ ┌───┐
10 ─ ┌───┐ │ │ ┌───┐
│ ┌───┐ │ │ │ │ │ │
│ │ │ │ │ │ │ ┌───┐ │ │
1 ─ ┌───┐ │ │ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │ │ │ │ │
│ │ │ │ │ │ │ │ │ │ ╷ │ │ ╷ │ │ ╷ ╷ │ │
└─┘ └─│───────│─┘ └─│─┘ └─│─┘ └─│─┘ └─│───────│─┘ └────
10μ₳ 100μ₳ 1000μ₳ 0.1₳ 1₳ 10₳ 100₳Remove wallet:
await wallet.delete();
Rename wallet:
let newName = 'new-name';
wallet = await wallet.rename(newName);
Change wallet passphrase:
let oldPassphrase = 'tangocrypto';
let newPassphrase = 'new-passphrase';
wallet = await wallet.updatePassphrase(oldPassphrase, newPassphrase);
NOTE: the wallet itself doesn't hold the passphrase, you can check it's correctly updated trying to call a method needing the passphrase e.g:
sendPayment
Cardano wallets are Multi-Account Hierarchy Deterministic that follow a variation of BIP-44 described here. All the addresses are derived from a root key (is like a key factory) which you can get from the recovery phrase. Also the wallets will always have 20 "consecutive" unused address, so anytime you use one of them new address will be "discovered" to keep the rule.
let addresses = await wallet.getAddresses(); // list will contain at least 20 address
Get unused addresses:
let unusedAddresses = await wallet.getUnusedAddresses();
Get used addresses:
let usedAddresses = await wallet.getUsedAddresses();
You can create/discover next unused address:
// you'll get the n-th address where n is the current addresses list length
let address = await wallet.getNextAddress();
// you can also pass the specific index
let address = await wallet.getAddressAt(45);
When you create a wallet the initial balance is 0. If you are in the mainnet you can transfer Ada to this address. If you are on the testnet you can request test tokens from the Faucet, just input one of the addresses of your wallet and request funds.
// get available balance. The balance you can expend
let availableBalance = wallet.getAvailableBalance();
// get rewards balance. The balance available to withdraw
let rewardBalance = wallet.getRewardBalance();
// get total balance. Total balance is the sum of available balance plus reward balance
let totalBalance = wallet.getTotalBalance();
The wallet have information about whether already delegate on a stake pool or not
let delegation = wallet.getDelegation();
console.log(delegation);
It the wallet is not delegate to any stake pool the output should be something similar to this:
{
"next": [],
"active": {
"status": "not_delegating"
}
}
If you start delegating (see Stake pool section the action will not take effect inmediatelly but the next property will indicate when the delegation will finally take effect.
The delegation meanwhile should look like this:
{
"next": [{
"status": "delegating",
"changes_at": {
"epoch_start_time": "2021-04-15T15:03:27Z",
"epoch_number": 10
},
"target": "pool1as50x0wtumtyqzs7tceeh5ry0syh8jnvpnuu9wlxswxuv48sw4w"
}],
"active": {
"status": "not_delegating"
}
}
NOTE: Property
changes_atwill indicate the epoch at the delegation will take effect
If we ask again after/during the epoch 10, we should get the delgation in place:
// refresh the wallet if you are using the same object. This will fecth the info from the blockchain
await wallet.refresh();
let delegation = wallet.getDelegation();
console.log(delegation);
Output:
> {
next: [],
active: {
status: 'delegating',
target: 'pool1as50x0wtumtyqzs7tceeh5ry0syh8jnvpnuu9wlxswxuv48sw4w'
}
}
Get stake pool ranking list by member rewards:
let stake = 1000000000;
let pools = await walletServer.getStakePools(stake);
NOTE: You'll get pool ordered by
non_myopic_member_rewardswhich basically means from heighest to lower expected rewards. By default the wallet server isn't configured to fecth the pool's metadata (e.g. ticker, name, homepage) but you can specify it through the update settings functionality, see Update Settings section below.
Estimate delegation fee:
let fee = await wallet.estimateDelegationFee();
NOTE: The very first time you delegate to a pool you'll be charged an extra 2 ADA. This extra fee won't be included on the response.
Delegate to stake pool:
let passphrase = 'tangocrypto';
// choose the first pool from the previous ranking list, but you can select whatever you want.
let pool = pools[0];
let transaction = await wallet.delegate(pool.id, passphrase);
NOTE: The transacion status initially is set to
pending, so you should keep tracking the transaction using theidin order to make sure the final status (e.g.in_ledger). You can learn more about the transacion's life cycle here. For delegate to another stake pool use the same method above specifying a different stake pool.
Withdraw stake pool's rewards:
let passphrase = 'tangocrypto';
// select the address to receive the rewards
let address = (await wallet.getUsedAddresses())[0];
// get the reward balance available to withdraw
let rewardBalance = wallet.getRewardBalance();
let transaction = await wallet.withdraw(passphrase, [address], [rewardBalance]);
NOTE: You can send the rewards to multiple addresses splitting up the rewardBalance for each one. Also you can send it to any valid address whether it's in your wallet or not.
Stop delegating:
let transaction = await wallet.stopDelegation(passphrase);
Stake pool maintenance actions:
let maintenanceActions = await walletServer.stakePoolMaintenanceActions();
Possible values are:
NOTE: Maintenance actions will depend on whether or not the wallet server is using a Stakepool Metadata Aggregation Server (SMASH).
Manually trigger Garbage Collection:
await walletServer.triggerStakePoolGarbageCollection();
Get wallet transactions:
// get all wallet transactions
let transactions = await wallet.getTransactions();
// filter by start and end date
let start = new Date(2021, 0, 1); // January 1st 2021;
let end = new Date(Date.now());
let transactions = await wallet.getTransactions(start, end);
Get transaction details:
let transaction = await wallet.getTransaction(tx.id);
Get payment fees:
let receiverAddress = new AddressWallet('addr1q99q78gt2898zgu2dcswf2yuxj6vujcqece38rycc7wsncl5lx8y....');
let amount = 5000000; // 5 ADA
let estimatedFees = await senderWallet.estimateFee([receiverAddress], [amount]);
Send payment transfer. Notice that you don't have to calculate the minimum fee, the SDK does that for you:
let passphrase = 'tangocrypto';
let receiverAddress = [new AddressWallet('addr1q99q78gt2898zgu2dcswf2yuxj6vujcqece38rycc7wsncl5lx8y....')];
let amounts = [5000000]; // 5 ADA
let transaction = await senderWallet.sendPayment(passphrase, receiverAddress, amounts);
NOTE: You can pass a list of address and amount. We expect both list have the same length where elemetns on each list is index related to the other. You can think of it as sending
amounts[i]toaddresses[i].
Send payment transfer with metadata:
Metadata can be expressed as a JSON object with some restrictions:
For more information check here.
let passphrase = 'tangocrypto';
let receiverAddress = [new AddressWallet('addr1q99q78gt2898zgu2dcswf2yuxj6vujcqece38rycc7wsncl5lx8y....')];
let amounts = [5000000]; // 5 ADA
let metadata = ['abc', '2512a00e9653fe49a44a5886202e24d77eeb998f', 123];
let transaction = await senderWallet.sendPayment(passphrase, receiverAddress, amounts, metadata);
WARNING: Please note that metadata provided in a transaction will be stored on the blockchain forever. Make sure not to include any sensitive data, in particular personally identifiable information (PII).
Send a more complex metadata object:
let passphrase = 'tangocrypto';
// receiver address
let receiverAddress = [new AddressWallet('addr1q99q78gt2898zgu2dcswf2yuxj6vujcqece38rycc7wsncl5lx8y....')];
let amounts = [5000000]; // 5 ADA
let metadata: any = {0: 'hello', 1: Buffer.from('2512a00e9653fe49a44a5886202e24d77eeb998f', 'hex'), 4: [1, 2, {0: true}], 5: {'key': null, 'l': [3, true, {}]}, 6: undefined};
let transaction = await senderWallet.sendPayment(passphrase, receiverAddress, amounts, metadata);
NOTE: Values like boolean, null and undefined are passed as string (e.g "true", "null", "undefined").
Forget transaction:
If for some reason your transaction hang on status pending, for a long period, you can consider to "cancel" it.
wallet.forgetTransaction(transaction.id)
Importantly: A transaction, when sent, cannot be cancelled. One can only request forgetting about it in order to try spending (concurrently) the same UTxO in another transaction. But, the transaction may still show up later in a block and therefore, appear in the wallet.
You can pass in a transaction created externally (by other tools) and submit it into the blockchain. You can use this library to create the transaction offline as well. Here is an example:
// recovery phrase, this should be the same you use to create the wallet (see Wallet section)
let recovery_phrase = [...];
// blockchain config, this is where you can find protocol params, slotsPerKESPeriod etc. Structure is: { byron: ..., shelley: ..., alonzo: ..., protocols: ... }
// This lib comes with Config.Mainnet, Config.Testnet and Config.LocalCluster config, but you should pass your own to make sure they are up to date.
// You can find the latest config files here: https://hydra.iohk.io/build/6498473/download/1/index.html
let config = { ..., "shelley": { ..., "protocolParams": {... "minFeeA": 44, ..., "minFeeB": 155381, ...} } }
// get first unused wallet's address
let addresses = (await wallet.getUnusedAddresses()).slice(0, 1);
let amounts = [1000000];
// get ttl
let info = await walletServer.getNetworkInformation();
let ttl = info.node_tip.absolute_slot_number * 12000;
// you can include metadata
let data: any = {0: 'hello', 1: Buffer.from('2512a00e9653fe49a44a5886202e24d77eeb998f', 'hex'), 4: [1, 2, {0: true}], 5: {'key': null, 'l': [3, true, {}]}, 6: undefined};
// get the tx structure with all the necessary components (inputs, outputs, change, etc).
let coinSelection = await wallet.getCoinSelection(addresses, amounts, data);
// get the signing keys (can be offline)
let rootKey = Seed.deriveRootKey(recovery_phrase);
let signingKeys = coinSelection.inputs.map(i => {
let privateKey = Seed.deriveKey(rootKey, i.derivation_path).to_raw_key();
return privateKey;
});
// build and sign tx (can be offline)
// include the metadata in the build and sign process
let metadata = Seed.buildTransactionMetadata(data);
let txBuild = Seed.buildTransaction(coinSelection, ttl, {metadata: metadata, config: config});
let txBody = Seed.sign(txBuild, signingKeys, metadata);
// submit the tx into the blockchain
let signed = Buffer.from(txBody.to_bytes()).toString('hex');
let txId = await walletServer.submitTx(signed);
There ara a couple of methods you can use to derive and get private/public key pairs. For more info check here.
Get root key from recovery phrase
let phrase = [...];
let rootKey = Seed.deriveRootKey(phrase);
console.log(rootKey.to_bech32());
Output:
> "xprv..."
Derive private/signing key (also known as spending key) from root key
let rootKey = Seed.deriveRootKey(phrase);
let privateKey = Seed.deriveKey(rootKey, ['1852H','1815H','0H','0','0']).to_raw_key();
console.log(privateKey.to_bech32());
Output:
> "ed25519e_sk1..."
Derive account key from root
let rootKey = Seed.deriveRootKey(phrase);
let accountKey = Seed.deriveAccountKey(rootKey, 0);
console.log(accountKey.to_bech32());
Output:
> "xprv..."
All the method mentioned above return a Bip32PrivateKey which you can use to keep deriving and generating keys and addresses check here for more info. For example, assuming you have cardano-serialization-lib installed,
you can get a stake address like this:
let rootKey = Seed.deriveRootKey(phrase);
let stakePrvKey = Seed.deriveKey(rootKey, ['1852H','1815H','0H','2','0']).to_raw_key();
const stakePubKey = stakePrvKey.to_public();
const rewardAddr = RewardAddress.new(
NetworkInfo.mainnet().network_id(),
StakeCredential.from_keyhash(stakePubKey.hash())
)
.to_address();
console.log(rewardAddr.to_bech32());
Output:
> "stake..."
Sign and verify a message using a private/public key pair.
let message = 'Hello World!!!';
const rootKey = Seed.deriveRootKey(phrase);
const accountKey = Seed.deriveAccountKey(rootKey);
// we'll use the stake private/public key at 0 in this case but you can use whatever private/public key pair.
const stakePrvKey = accountKey
.derive(CARDANO_CHIMERIC) // chimeric
.derive(0);
const privateKey = stakePrvKey.to_raw_key();
const publicKey = privateKey.to_public();
const signed = Seed.signMessage(privateKey, message);
const verify_result = Seed.verifyMessage(publicKey, message, signed);
Output:
> True
You can create native tokens just creating a transaction with a couple of differences, here is an example:
// address to hold the minted tokens. You can use which you want.
let addresses = [(await wallet.getAddresses())[0]];
// blockchain config, this is where you can find protocol params, slotsPerKESPeriod etc. Structure is: { byron: ..., shelley: ..., alonzo: ..., protocols: ... }
// This lib comes with Config.Mainnet, Config.Testnet and Config.LocalCluster config (LocalCluster, LocalCluster and LocalCluster), but you may consider provide your own to make sure they are up to date.
// You can find the latest config files here: https://hydra.iohk.io/build/6498473/download/1/index.html
let config = { ..., "shelley": { ..., "protocolParams": {... "minFeeA": 44, ..., "minFeeB": 155381, ...} } }
// policy public/private keypair
let keyPair= Seed.generateKeyPair();
let policyVKey = keyPair.publicKey;
let policySKey = keyPair.privateKey;
// generate single issuer native script
let keyHash = Seed.getKeyHash(policyVKey);
let script = Seed.buildSingleIssuerScript(keyHash);
//generate policy id
let scriptHash = Seed.getScriptHash(script);
let policyId = Seed.getPolicyId(scriptHash);
// metadata
let data: any = {};
let tokenData: any = {}
tokenData[policyId] = {
Tango: {
arweaveId: "arweave-id",
ipfsId: "ipfs-id",
name: "Tango",
description: "Tango crypto coin",
type: "Coin"
}
};
data[0] = tokenData;
// asset
let asset = new AssetWallet(policyId, "Tango", 1000000);
// token
let tokens = [new TokenWallet(asset, script, [keyPair])];
//scripts
let scripts = tokens.map(t => t.script);
// get min ada for address holding tokens
let minAda = Seed.getMinUtxoValueWithAssets([asset], config);
let amounts = [minAda];
// get ttl info
let info = await walletServer.getNetworkInformation();
let ttl = info.node_tip.absolute_slot_number * 12000;
// get coin selection structure (without the assets)
let coinSelection = await wallet.getCoinSelection(addresses, amounts, data);
// add signing keys
let rootKey = Seed.deriveRootKey(payeer.mnemonic_sentence);
let signingKeys = coinSelection.inputs.map(i => {
let privateKey = Seed.deriveKey(rootKey, i.derivation_path).to_raw_key();
return privateKey;
});
// add policy signing keys
tokens.filter(t => t.scriptKeyPairs).forEach(t => signingKeys.push(...t.scriptKeyPairs.map(k => k.privateKey.to_raw_key())));
let metadata = Seed.buildTransactionMetadata(data);
// the wallet currently doesn't support including tokens not previuosly minted
// so we need to include it manually.
coinSelection.outputs = coinSelection.outputs.map(output => {
if (output.address === addresses[0].address) {
output.assets = tokens.map(t => {
let asset: WalletsAssetsAvailable = {
policy_id: t.asset.policy_id,
asset_name: Buffer.from(t.asset.asset_name).toString('hex'),
quantity: t.asset.quantity
};
return asset;
});
}
return output;
});
// we need to sing the tx and calculate the actual fee and the build again
// since the coin selection doesnt calculate the fee with the asset tokens included
let txBody = Seed.buildTransactionWithToken(coinSelection, ttl, tokens, signingKeys, {data: data, config: config});
let tx = Seed.sign(txBody, signingKeys, metadata, scripts);
// submit the tx
let signed = Buffer.from(tx.to_bytes()).toString('hex');
let txId = await walletServer.submitTx(signed);
NOTE: You can check more scripts on
test/assets.ts, this example is the equivalent to "RequireSignature" you can create with JSON:
{ "type": "sig", "keyHash": "e09d36c79dec9bd1b3d9e152247701cd0bb860b5ebfd1de8abb6735a" }
Here you have two options, either rely on cardano-wallet directly or build the tx by yourself (using cardano-serialization-lib).
// passphrase
let passphrase = "your passphrase";
let policyId = "your policyId";
// passphrase
let passphrase = "your passphrase";
let policyId = "your policyId";
// blockchain config, this is where you can find protocol params, slotsPerKESPeriod etc. Structure is: { byron: ..., shelley: ..., alonzo: ..., protocols: ... }
// This lib comes with Config.Mainnet, Config.Testnet and Config.LocalCluster config (LocalCluster, LocalCluster and LocalCluster), but you may consider provide your own to make sure they are up to date.
// You can find the latest config files here: https://hydra.iohk.io/build/6498473/download/1/index.html
let config = { ..., "shelley": { ..., "protocolParams": {... "minFeeA": 44, ..., "minFeeB": 155381, ...} } }
// address to send the minted tokens
let addresses = [new AddressWallet("addr......")];
let asset = new AssetWallet(policyId, "Tango", 100);
// bind the asset to the address
let assets = {};
assets[addresses[0].id] = [asset];
// calculate the min ADA to send in the tx
let minAda = Seed.getMinUtxoValueWithAssets([asset], config);
// send it using the wallet
let tx = await wallet.sendPayment(passphrase, addresses, [minAda], ['send 100 Tango tokens'], assets);
// passphrase
let passphrase = "your passphrase";
let policyId = "your policyId";
// blockchain config, this is where you can find protocol params, slotsPerKESPeriod etc. Structure is: { byron: ..., shelley: ..., alonzo: ..., protocols: ... }
// This lib comes with Config.Mainnet, Config.Testnet and Config.LocalCluster config (LocalCluster, LocalCluster and LocalCluster), but you should pass your own to make sure they are up to date.
// You can find the latest config files here: https://hydra.iohk.io/build/6498473/download/1/index.html
let config = { ..., "shelley": { ..., "protocolParams": {... "minFeeA": 44, ..., "minFeeB": 155381, ...} } }
// address to send the minted tokens
let addresses = [new AddressWallet("addr......")];
let asset = new AssetWallet(policyId, "Tango", 100);
// blockchain config, this is where you can find protocol params, slotsPerKESPeriod etc. Structure is: { byron: ..., shelley: ..., alonzo: ..., protocols: ... }
// This lib comes with Config.Mainnet, Config.Testnet and Config.LocalCluster config, but you may consider provide your own to make sure they are up to date.
// You can find the latest config files here: https://hydra.iohk.io/build/6498473/download/1/index.html
let config = { ..., "shelley": { ..., "protocolParams": {... "minFeeA": 44, ..., "minFeeB": 155381, ...} } }
// bind the asset to the address
let assets = {};
assets[addresses[0].id] = [asset];
// calculate the min ADA to send in the tx
let minUtxo = Seed.getMinUtxoValueWithAssets([asset], config)
// you can include metadata as well
let data = ['send 100 Tango tokens'];
let coinSelection = await wallet.getCoinSelection(addresses, [minUtxo], data, assets);
let info = await walletServer.getNetworkInformation();
//build and sign tx
let rootKey = Seed.deriveRootKey(payeer.mnemonic_sentence);
let signingKeys = coinSelection.inputs.map(i => {
let privateKey = Seed.deriveKey(rootKey, i.derivation_path).to_raw_key();
return privateKey;
});
let metadata = Seed.buildTransactionMetadata(data);
let txBuild = Seed.buildTransaction(coinSelection, info.node_tip.absolute_slot_number * 12000, {metadata: metadata, config: config});
let txBody = Seed.sign(txBuild, signingKeys, metadata);
let signed = Buffer.from(txBody.to_bytes()).toString('hex');
let txId = await walletServer.submitTx(signed);
In order to create a multisignature transaction (multisig tx) we must create a script that will act as a "guard" for the funds sent to the script address. Once the funds are already there, the only way to move it will be fulfilling the script logic (Multisig is just a specific script case that force a list of private keys to be present on the final tx). Check the examples folder and here you can see an explanation of what is multisig and a demo https://www.youtube.com/watch?v=H7O4b_PtQ-8&t=41s
const { Seed, ScriptTypeEnum, WalletswalletIdpaymentfeesAmountUnitEnum, Config, Bip32PrivateKey } = require('cardano-wallet-js');
// script that force 2 private keys to be presents on the final tx.
const data: JsonScript = {
"type": ScriptTypeEnum.All, // "all"
"scripts":
[
{
"type": ScriptTypeEnum.Sig, // "sig"
},
{
"type": ScriptTypeEnum.Sig, // "sig"
}
]
};
// generate the native script
const script = Seed.buildScript(data);
// get the json equivalent for this native script.
// It'll look similar to the JSON above but with an extra field 'keyHash' for each entry of type 'sig'. E.g
// {
// "type": "all"
// "scripts": [
// {
// "type": "sig",
// "keyHash": "e09d36c79dec9bd1b3d9e152247701cd0bb860b5ebfd1de8abb6735a"
// },
// {
// "type": "sig",
// "keyHash": "a687dcc24e00dd3caafbeb5e68f97ca8ef269cb6fe971345eb951756"
// }]
//}
const jsonScript = Seed.scriptToJson(script);
// get native script private keys (all them will be needed to sign the final tx)
const keys = Seed.getScriptKeys(script).map(k => k.to_bech32());
In the previous step, we created a native script and got the JSON representation along with the private keys involved. To check if your resulting private keys indeed match your private keys, you can do this:
const keyHashes = keys.map(k => Buffer.from(Seed.getKeyHash(Bip32PrivateKey.from_bech32(k).to_public()).to_bytes()).toString('hex'));
const jsonHashes = json.scripts.map((s:any) => s.keyHash);
// now both array should have the same data inside. Using Mocha or any similar test tool you can easily test it:
expect(keyHashes).deep.equal(jsonHashes);
The next step is to get the script address, so we can send funds to it. Here is the example (testnet address):
const script = Seed.buildScript(jsonScript);
const address = Seed.getScriptAddress(script, 'testnet').to_bech32();
console.log(address);
Output:
> "addr_test1..."
:warning: IMPORTANT: Send some funds to this script address before continue
Now that we have the script address and the private keys tied to it, we're ready to send some funds away from this address (remember we'll need all the private keys involved, this is the multisig part). The approach is very similar to the previous one where we build a tx by ourselves. The bellow example assume we have a coin selection already, which mean we got the script address UTXOs and created the inputs, outputs and change using some method like wallet.getCoinSelection(...)
NOTE: You can pass any fee you want in the coin selection,
Seed.buildTransactionMultisig(...)will adjust it accordingly.
// get private keys
const signingKeys = scriptKeys.map(key => Bip32PrivateKey.from_bech32(key).to_raw_key());
// get native script (this is the SAME SCRIPT, we're just "loading" it back)
const script = Seed.buildScript(jsonScript);
// set network configuration
let buildOpts = {
startSlot: 0,
config: Config.Testnet,
};
const ttl = 445331390; // slot before the tx should be processed
const selection: CoinSelectionWallet = {
"withdrawals": [] as any[],
"inputs": [
{
"amount": {
"quantity": 5574291,
"unit": WalletswalletIdpaymentfeesAmountUnitEnum.Lovelace
},
"address": "addr_test1...", // script address
"id": "f23e1e9c8cdcc8a3dfbd...",
"assets": [],
"index": 1
},
],
"deposits": [],
"change": [
{
"amount": {
"quantity": 4394291, // fee of 180000 initially
"unit": WalletswalletIdpaymentfeesAmountUnitEnum.Lovelace
},
"address": "addr_test1...",
"assets": []
}
],
"outputs": [
{
"amount": {
"quantity": 1000000,
"unit": WalletswalletIdpaymentfeesAmountUnitEnum.Lovelace
},
"address": "addr_test1...",
"assets": []
}
]
};
// for the script witnesses we only need to specify the native script root
const scripts = [script.root];
// build the tx (you can include signingkeys here, eg: let tx = Seed.buildTransactionMultisig(selection, ttl, scripts, null, sigingKeys, buildOpts);)
let tx = Seed.buildTransactionMultisig(selection, ttl, scripts, null, [], buildOpts);
// add witness
tx.addKeyWitnesses(signingKeys[0]);
// encode/decode multisig tx
const encode = tx.toBytes();
tx = MultisigTransaction.fromBytes(encode);
// add witness
tx.addKeyWitnesses(signingKeys[1]);
const signed = tx.build();
console.log(signed)
Output:
> "84a500818258204b6a8bf9..."
:warning: IMPORTANT: Don't forget to pass in the native script on
Seed.buildTransactionMultisig(...)
you'll need to install stack >= 1.9.3 you can find it here: https://docs.haskellstack.org/en/stable/README/. You may need to install the libsodium-dev, libghc-hsopenssl-dev, gmp, sqlite and systemd development libraries for the build to succeed.
Also you will need cardano-node and cardano-cli binaries availables on your PATH.
The setup steps are quite simple:
clone: cardano-wallet
execute: stack install cardano-wallet:exe:local-cluster
Set a specific port export CARDANO_WALLET_PORT=7355 so the wallet always start at the same port.
run ~/.local/bin/local-cluster
FAQs
javascript/typescript client for the official cardano-wallet api
The npm package cardano-wallet-js receives a total of 471 weekly downloads. As such, cardano-wallet-js popularity was classified as not popular.
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