GitHub - arkade-os/go-sdk: The Arkade SDK is a Go package for building Bitcoin wallets with support for both on-chain and off-chain transactions via the Ark protocol.

Arkade Go SDK

The complete API documentation for the Go SDK is automatically generated and published on pkg.go.dev with each GitHub release. To view the documentation, visit: https://pkg.go.dev/github.com/arkade-os/go-sdk

Installation

To install the Arkade Go SDK, use the following command:

go get github.com/arkade-os/go-sdk

Usage

Here's a comprehensive guide on how to use the Arkade Go SDK:

1. Setting up the Ark Client

NewArkClient(datadir string, verbose bool) accepts two parameters:

datadir — path to the directory where wallet and transaction data are persisted. Pass "" to use in-memory storage (useful for testing).
verbose — when true, debug-level logs are printed after the wallet is unlocked.

This gives four combinations:

import arksdk "github.com/arkade-os/go-sdk"

// In-memory storage, no logs (testing)
client, err := arksdk.NewArkClient("", false)

// In-memory storage, verbose logs (testing with debug output)
client, err := arksdk.NewArkClient("", true)

// Persistent storage, no logs (production)
client, err := arksdk.NewArkClient("/path/to/data/dir", false)

// Persistent storage, verbose logs (production with debug output)
client, err := arksdk.NewArkClient("/path/to/data/dir", true)

Once you have a client, call Init to connect it to an Ark server and set up the wallet:

// Minimal — single-key wallet, default explorer URL for the network.
if err := client.Init(ctx, "localhost:7070", "your_seed", "your_password"); err != nil {
    return fmt.Errorf("failed to initialize wallet: %s", err)
}

// Restore an existing wallet from seed.
if err := client.Init(ctx, "localhost:7070", "your_seed", "your_password"); err != nil {
    return fmt.Errorf("failed to restore wallet: %s", err)
}

// Custom explorer URL.
if err := client.Init(
    ctx, "localhost:7070", "your_seed", "your_password",
    arksdk.WithExplorerURL("https://example.com"),
); err != nil {
    return fmt.Errorf("failed to initialize wallet: %s", err)
}

// Bring your own wallet implementation.
if err := client.Init(
    ctx, "localhost:7070", "your_seed", "your_password",
    arksdk.WithWallet(myWalletService),
); err != nil {
    return fmt.Errorf("failed to initialize wallet: %s", err)
}

2. Client Configuration Options

Init has the following signature:

Init(ctx context.Context, serverUrl, seed, password string, opts ...InitOption) error

serverUrl — address of the Ark server (e.g. "localhost:7070").
seed — hex-encoded private key for wallet initialization or restoration.
password — password used to encrypt and protect the wallet.
opts — optional functional options:
- WithExplorerURL(url string) — override the default mempool explorer URL for the network.
- WithWallet(wallet wallet.WalletService) — supply a custom wallet implementation instead of the built-in single-key wallet.

Note: Always keep your seed and password secure. Never share them or store them in plaintext.

3. Wallet Operations

Unlock and Lock the Wallet

if err := arkClient.Unlock(ctx, password); err != nil {
    log.Fatal(err)
}
defer arkClient.Lock(ctx)

Receive Funds

The old Receive API has been split into three dedicated methods:

onchainAddr, err := arkClient.NewOnchainAddress(ctx)
if err != nil {
    log.Fatal(err)
}
log.Infof("Onchain address: %s", onchainAddr)

boardingAddr, err := arkClient.NewBoardingAddress(ctx)
if err != nil {
    log.Fatal(err)
}
log.Infof("Boarding address: %s", boardingAddr)

offchainAddr, err := arkClient.NewOffchainAddress(ctx)
if err != nil {
    log.Fatal(err)
}
log.Infof("Offchain address: %s", offchainAddr)

Check Balance

balance, err := arkClient.Balance(ctx)
if err != nil {
    log.Fatal(err)
}
log.Infof("Onchain balance: %d", balance.OnchainBalance.SpendableAmount)
log.Infof("Offchain balance: %d", balance.OffchainBalance.Total)

// Asset balances are keyed by asset ID (string).
for assetID, amount := range balance.AssetBalances {
    log.Infof("Asset %s balance: %d", assetID, amount)
}

Send Offchain

import clientTypes "github.com/arkade-os/arkd/pkg/client-lib/types"

// Send sats offchain.
receivers := []clientTypes.Receiver{
    {To: recipientOffchainAddr, Amount: 1000},
}
txid, err := arkClient.SendOffChain(ctx, receivers)
if err != nil {
    log.Fatal(err)
}
log.Infof("Transaction completed: %s", txid)

// Send assets offchain. If not specified, like in this example, the real recipient's amount defaults to 330 sats (dust).
assetReceivers := []clientTypes.Receiver{
    {
        To: recipientOffchainAddr,
        Assets: []clientTypes.Asset{
            {AssetId: assetID, Amount: 1200},
        },
    },
}
txid, err = arkClient.SendOffChain(ctx, assetReceivers)
if err != nil {
    log.Fatal(err)
}
log.Infof("Asset transfer completed: %s", txid)

Submit Transaction

SendOffChain is useful for simple send operations. But complex contract or collaborative transactions require more flexibility. In this case, you can use the TransportClient.SubmitTx and TransportClient.FinalizeTx APIs.

// Create a new transport client
transportClient, err := grpcclient.NewClient("localhost:7070")
require.NoError(t, err)

// Use ark-lib/tree util function to build ark and checkpoint transactions.
arkTx, checkpointTxs, err := offchain.BuildTxs(
	[]offchain.VtxoInput{
		// ... your inputs here
	},
	[]*wire.TxOut{
		// ... your outputs here
	},
	batchOutputSweepClosure,
)

signedArkTx, err := arkClient.SignTransaction(ctx, arkTx)
if err != nil {
	return "", err
}

arkTxid, _, signedCheckpointTxs, err := grpcclient.SubmitTx(ctx, signedArkTx, checkpointTxs)
if err != nil {
	return "", err
}

// Counter-sign and checkpoint txs and send them back to the server to complete the process.
finalCheckpointTxs := make([]string, 0, len(signedCheckpointTxs))
for _, checkpointTx := range signedCheckpointTxs {
	finalCheckpointTx, err := a.SignTransaction(ctx, checkpointTx)
	if err != nil {
		return "", nil
	}
	finalCheckpointTxs = append(finalCheckpointTxs, finalCheckpointTx)
}

if err = a.client.FinalizeTx(ctx, arkTxid, finalCheckpointTxs); err != nil {
	return "", err
}

Asset Operations

Arkade supports issuing, transferring, reissuing, and burning custom assets offchain.

Concepts:

An asset is identified by a string asset ID derived from the genesis transaction ID and group index.
A control asset is a special asset that grants authority to reissue a given asset. Holding the control asset vtxo in your wallet is required to call ReissueAsset.
Without a control asset, an issued asset has a fixed, immutable supply.

Issue Asset

import (
    "github.com/arkade-os/arkd/pkg/ark-lib/asset"
    clientTypes "github.com/arkade-os/arkd/pkg/client-lib/types"
)

// 1. Fixed supply — no control asset. Returns one asset ID.
txid, assetIds, err := arkClient.IssueAsset(ctx, 5000, nil, nil)
if err != nil {
    log.Fatal(err)
}
assetID := assetIds[0].String()
log.Infof("Issued asset %s in tx %s", assetID, txid)

// 2. With a new control asset issued together with the controlled one.
//    Returns two asset IDs: [controlAssetId, issuedAssetId].
txid, assetIds, err = arkClient.IssueAsset(ctx, 5000, clientTypes.NewControlAsset{Amount: 1}, nil)
if err != nil {
    log.Fatal(err)
}
controlAssetID := assetIds[0].String()
assetID = assetIds[1].String()
log.Infof("Control asset: %s, issued asset: %s", controlAssetID, assetID)

// 3. With an existing control asset.
//    Returns one asset ID for the newly issued asset.
txid, assetIds, err = arkClient.IssueAsset(
    ctx, 5000, clientTypes.ExistingControlAsset{ID: controlAssetID}, nil,
)
if err != nil {
    log.Fatal(err)
}
log.Infof("Issued asset %s under existing control asset", assetIds[0].String())

// Optional: attach metadata to the asset.
meta := []asset.Metadata{
    {Key: "name", Value: "My Token"},
    {Key: "ticker", Value: "MTK"},
}
txid, assetIds, err = arkClient.IssueAsset(ctx, 5000, clientTypes.NewControlAsset{Amount: 1}, meta)

Reissue Asset

The caller must hold the control asset vtxo in their wallet.

txid, err := arkClient.ReissueAsset(ctx, assetID, 1000)
if err != nil {
    log.Fatal(err)
}
log.Infof("Reissued 1000 units of %s in tx %s", assetID, txid)

Burn Asset

Destroys the specified amount. Any remaining balance is returned to the caller's address as change.

txid, err := arkClient.BurnAsset(ctx, assetID, 500)
if err != nil {
    log.Fatal(err)
}
log.Infof("Burned 500 units of %s in tx %s", assetID, txid)

4. Advanced Usage

Multiple Recipients

You can send to multiple recipients in a single transaction:

receivers := []clientTypes.Receiver{
    {To: recipient1OffchainAddr, Amount: amount1},
    {To: recipient2OffchainAddr, Amount: amount2},
}
txid, err = arkClient.SendOffChain(ctx, receivers)

Cooperative Exit

To move funds from offchain to onchain:

txid, err := arkClient.CollaborativeExit(ctx, onchainAddress, redeemAmount)
if err != nil {
    log.Fatal(err)
}
log.Infof("Redeemed with tx: %s", txid)

5. Additional Client Functions

The ArkClient interface exposes a number of utility methods beyond the basic workflow shown above. Here is a quick overview:

GetVersion() - return the SDK version.
GetConfigData(ctx) - retrieve Ark server configuration details.
Init(ctx, serverUrl, seed, password, opts...) - create or restore a wallet and connect to the server. See §2 for available options.
IsLocked(ctx) - check if the wallet is currently locked.
Unlock(ctx, password) / Lock(ctx) - unlock or lock the wallet.
IsSynced(ctx) <-chan types.SyncEvent - returns a channel that emits once the local database has finished syncing after unlock.
Balance(ctx) - query onchain and offchain balances. The returned struct includes AssetBalances map[string]uint64 keyed by asset ID.
IssueAsset(ctx, amount, controlAsset, metadata) — mint a new offchain asset. Pass nil for a fixed-supply asset, types.NewControlAsset{Amount} to create a reissuable asset with a new control asset, or types.ExistingControlAsset{ID} to issue under an existing control asset. Returns the ark txid and the resulting asset IDs.
ReissueAsset(ctx, assetId, amount) — mint additional supply of an existing controllable asset. Requires the caller to hold the corresponding control asset vtxo.
BurnAsset(ctx, assetID, amount) — permanently destroy a quantity of an asset. Remaining balance is returned as change to the caller's address.
GetAddresses(ctx) - return all known onchain, offchain, boarding and redemption addresses.
NewOnchainAddress(ctx) / NewBoardingAddress(ctx) / NewOffchainAddress(ctx) - derive a fresh address of the respective type.
SendOffChain(ctx, receivers) - send funds offchain. Each clientTypes.Receiver can carry an Assets []clientTypes.Asset slice to transfer assets alongside sats.
Settle(ctx) (string, error) - finalize pending or preconfirmed funds into a commitment transaction.
RegisterIntent(...) / DeleteIntent(...) - manage spend intents for collaborative transactions.
CollaborativeExit(ctx, addr, amount) (string, error) - redeem offchain funds onchain.
Unroll(ctx) error - broadcast unroll transactions when ready.
CompleteUnroll(ctx, to string) (string, error) - finalize an unroll and sweep to an onchain address.
OnboardAgainAllExpiredBoardings(ctx) (string, error) - onboard again using expired boarding UTXOs.
WithdrawFromAllExpiredBoardings(ctx, to string) (string, error) - withdraw expired boarding amounts onchain.
ListVtxos(ctx) (spendable, spent []clientTypes.Vtxo, err error) - list virtual UTXOs. Each Vtxo includes an Assets []types.Asset field listing any assets it carries.
ListSpendableVtxos(ctx) - list only spendable virtual UTXOs.
Dump(ctx) (seed string, error) - export the wallet seed.
GetTransactionHistory(ctx) - fetch past transactions.
GetTransactionEventChannel(ctx), GetVtxoEventChannel(ctx) and GetUtxoEventChannel(ctx) - subscribe to wallet events.
FinalizePendingTxs(ctx, createdAfter *time.Time) ([]string, error) - finalize any pending transactions, optionally filtered by creation time.
RedeemNotes(ctx, notes) - redeem Ark notes back to your wallet.
SignTransaction(ctx, tx) - sign an arbitrary transaction.
NotifyIncomingFunds(ctx, address) - wait until a specific offchain address receives funds.
Stop() - stop any running listeners.

6. Transport Client

For lower-level control over transaction batching you can use the TransportClient interface directly:

GetInfo(ctx) - return server configuration and network data.
RegisterIntent(ctx, signature, message) and DeleteIntent(ctx, signature, message) - manage collaborative intents.
ConfirmRegistration(ctx, intentID) - confirm intent registration on chain.
SubmitTreeNonces(ctx, batchId, cosignerPubkey, nonces) and SubmitTreeSignatures(ctx, batchId, cosignerPubkey, sigs) - coordinate cosigner trees.
SubmitSignedForfeitTxs(ctx, signedForfeitTxs, signedCommitmentTx) - provide fully signed forfeit and commitment transactions.
GetEventStream(ctx, topics) - subscribe to batch events from the server.
SubmitTx(ctx, signedArkTx, checkpointTxs) and FinalizeTx(ctx, arkTxid, finalCheckpointTxs) - submit collaborative transactions.
GetTransactionsStream(ctx) - stream transaction notifications.
Close() - close the transport connection.

See the pkg.go.dev documentation for detailed API information.

Testing

Run integration tests (start nigiri if needed first):

make regtest
make integrationtest
make regtestdown

Full Example

The snippet below shows the complete flow from client creation to an offchain send:

package main

import (
    "context"
    "fmt"
    "log"

    arksdk "github.com/arkade-os/go-sdk"
    clientTypes "github.com/arkade-os/arkd/pkg/client-lib/types"
)

func main() {
    ctx := context.Background()
	prvkey := "ff694aab53abf53843f5cd1ffd8d488d743b08b35f48598bdcbab3f71d430e01"
	password := "secret"
	serverUrl := "localhost:7070"

    // Create a persistent client with debug logs enabled.
    client, err := arksdk.NewArkClient("/path/to/data/dir", true)
    if err != nil {
        log.Fatal(err)
    }
    defer client.Stop()

    // Connect to the server and set up the wallet.
    if err := client.Init(ctx, serverUrl, prvkey, password); err != nil {
        log.Fatal(err)
    }

    // Unlock the wallet to start syncing.
    if err := client.Unlock(ctx, password); err != nil {
        log.Fatal(err)
    }
    defer client.Lock(ctx)

    // Wait for the local database to finish syncing.
    syncCh := client.IsSynced(ctx)
    if event := <-syncCh; event.Err != nil {
        log.Fatal(event.Err)
    }

    // Generate a fresh offchain address to receive funds.
    offchainAddr, err := client.NewOffchainAddress(ctx)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Offchain address:", offchainAddr)

    // Check balance.
    balance, err := client.Balance(ctx)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Offchain balance: %d sats\n", balance.OffchainBalance.Total)

    // Send offchain.
    receivers := []clientTypes.Receiver{
        {To: "<recipient_offchain_addr>", Amount: 1000},
    }
    txid, err := client.SendOffChain(ctx, receivers)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("Transaction ID:", txid)
}

Support

If you encounter any issues or have questions, please file an issue on our GitHub repository.

Happy coding with Ark and Go! 🚀

Name		Name	Last commit message	Last commit date
Latest commit History 109 Commits
.github		.github
api-spec/protobuf/gen/ark/v1		api-spec/protobuf/gen/ark/v1
store		store
test		test
types		types
.gitignore		.gitignore
.golangci.yml		.golangci.yml
CONTRIBUTING.md		CONTRIBUTING.md
Makefile		Makefile
README.md		README.md
asset.go		asset.go
batch_session.go		batch_session.go
batch_session_opts.go		batch_session_opts.go
batch_session_opts_test.go		batch_session_opts_test.go
broadcaster.go		broadcaster.go
broadcaster_test.go		broadcaster_test.go
buf.Dockerfile		buf.Dockerfile
buf.gen.yaml		buf.gen.yaml
client.go		client.go
client_internal_test.go		client_internal_test.go
client_opts.go		client_opts.go
client_opts_test.go		client_opts_test.go
client_test.go		client_test.go
funding.go		funding.go
go.mod		go.mod
go.sum		go.sum
init.go		init.go
init_opts.go		init_opts.go
init_opts_test.go		init_opts_test.go
sdk.go		sdk.go
send.go		send.go
sync.go		sync.go
sync_test.go		sync_test.go
unroll.go		unroll.go
utils.go		utils.go
utils_test.go		utils_test.go

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Arkade Go SDK

Installation

Usage

1. Setting up the Ark Client

2. Client Configuration Options

3. Wallet Operations

Unlock and Lock the Wallet

Receive Funds

Check Balance

Send Offchain

Submit Transaction

Asset Operations

Issue Asset

Reissue Asset

Burn Asset

4. Advanced Usage

Multiple Recipients

Cooperative Exit

5. Additional Client Functions

6. Transport Client

Testing

Full Example

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Arkade Go SDK

Installation

Usage

1. Setting up the Ark Client

2. Client Configuration Options

3. Wallet Operations

Unlock and Lock the Wallet

Receive Funds

Check Balance

Send Offchain

Submit Transaction

Asset Operations

Issue Asset

Reissue Asset

Burn Asset

4. Advanced Usage

Multiple Recipients

Cooperative Exit

5. Additional Client Functions

6. Transport Client

Testing

Full Example

Support

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