arklabshq/noa-cli

noa CLI

Ark companion CLI for decoding and inspecting Bitcoin/Ark primitives. Source: ~/code/go/noa | Module: github.com/louisinger/noa Depends on: github.com/arkade-os/arkd/pkg/ark-lib

Install

go install github.com/louisinger/noa@latest
# or from source
make -C ~/code/go/noa install

Commands

address — Decode an Ark address

noa address <ark_address>

Output: version, HRP, signer pubkey, VTXO tapkey, pkScript (hex + asm). Uses arklib.DecodeAddressV0.

script — Decode a Bitcoin script to ASM + Ark closure

noa script <script_hex>

Output: ASM disassembly, then closure type and fields. Recognized closure types:

• MultisigClosure — pubkeys list
• CLTVMultisigClosure — pubkeys + absolute locktime (blocks or seconds)
• CSVMultisigClosure — pubkeys + relative locktime (blocks or seconds)
• ConditionMultisigClosure — pubkeys + condition script
• ConditionCSVMultisigClosure — pubkeys + relative locktime + condition script

note fromTxid — Generate a note closure from a txid

noa note fromTxid <txid_hex>

Takes a 32-byte txid as preimage hash, creates a NoteClosure, derives the taproot tapkey and pkScript. Output: tapkey (hex), script (hex + asm).

taptree decode — Decode a hex-encoded taptree

noa taptree decode <taptree_hex>

Decodes via txutils.DecodeTapTree. Output: all leaf scripts (hex + asm), then the derived pkScript (hex + asm).

taptree encode — Encode scripts into a taptree

noa taptree encode <script1_hex> [script2_hex] ...

Takes one or more hex-encoded scripts, encodes into a taptree via txutils.TapTree.Encode(). Output: encoded taptree (hex).

psbt decode — Decode a PSBT with Ark extensions

noa psbt decode <psbt_base64_or_hex>

Auto-detects base64 vs hex input. Output:

• Global: version, locktime, txid
• Inputs: outpoint, sequence, redeem/witness scripts, BIP32 derivations, witness UTXO (value + pkScript)
• Ark PSBT fields (per input, when present):
  • ConditionWitness — witness stack items
  • CosignerPublicKey — index + schnorr pubkey
  • VtxoTaprootTree — list of script hex strings
  • VtxoTreeExpiry — relative locktime type + value
• Outputs: value, pkScript (hex + asm), redeem/witness scripts, BIP32 derivations

Input Formats

All hex inputs are raw hex strings (no 0x prefix). PSBT accepts both base64 and hex. noa script expects raw tapscript leaf scripts (closure scripts), NOT P2TR pkScripts.

Ark Indexer REST API

Base URL: http://localhost:7070 (default, adjust per environment). All GET endpoints. Responses are JSON. Pagination via ?page.size=N&page.index=I.

Endpoints

Commitment TX

• GET /v1/indexer/commitmentTx/{txid} — round info: batches, input/output counts, amounts, timestamps
• GET /v1/indexer/commitmentTx/{txid}/forfeitTxs — forfeit txids for a commitment
• GET /v1/indexer/commitmentTx/{txid}/connectors — connector tree nodes (txid + children map)

Batch / VTXO Tree

• GET /v1/indexer/batch/{txid}/{vout}/tree — full VTXO tree structure (nodes with children)
• GET /v1/indexer/batch/{txid}/{vout}/tree/leaves — leaf outpoints only
• GET /v1/indexer/batch/{txid}/{vout}/sweepTxs — on-chain txids that swept this batch

VTXOs

• GET /v1/indexer/vtxos?outpoints={txid}:{vout} — lookup by outpoint
• GET /v1/indexer/vtxos?scripts={script_hex} — lookup by pkScript
• Filters: spendable_only, spent_only, recoverable_only, pending_only, after, before

VTXO Chain

• GET /v1/indexer/vtxo/{txid}/{vout}/chain — chain of ark txs from tree leaf to this VTXO
• Each entry has: txid, expiresAt, type (COMMITMENT/ARK/TREE/CHECKPOINT), spends

Virtual Transactions

• GET /v1/indexer/virtualTx/{txid} — returns PSBT in base64 (feed directly to noa psbt decode)

Assets

• GET /v1/indexer/asset/{asset_id} — asset info (supply, metadata, control_asset)

Key Response Types

IndexerVtxo: outpoint, createdAt, expiresAt, amount, script (pkScript hex), isPreconfirmed, isSwept, isUnrolled, isSpent, spentBy, commitmentTxids, settledBy, arkTxid, assets

IndexerChain: txid, expiresAt, type (COMMITMENT|ARK|TREE|CHECKPOINT), spends (parent txids)

Recipe: Investigate a VTXO from Outpoint

Given a {txid}:{vout}:

Step 1 — Get VTXO metadata

curl -s "http://localhost:7070/v1/indexer/vtxos?outpoints={txid}:{vout}" | jq

Note: amount, script, status flags (isSpent, isSwept, isUnrolled), commitmentTxids.

Step 2 — Get VTXO chain (ancestry)

curl -s "http://localhost:7070/v1/indexer/vtxo/{txid}/{vout}/chain" | jq

Shows the chain from commitment → tree → ark txs. Identify the commitment txid (type=COMMITMENT).

Step 3 — Inspect commitment round

curl -s "http://localhost:7070/v1/indexer/commitmentTx/{commitment_txid}" | jq

Shows batches, total input/output amounts and VTXO counts, timestamps, swept status.

Step 4 — Decode the VTXO tree tx with noa

VTXO_PSBT=$(curl -s "http://localhost:7070/v1/indexer/virtualTx/{txid}" | jq -r '.txs[0]')
noa psbt decode "$VTXO_PSBT"

Look for: cosigner pubkeys, VTXO tree expiry, output values and pkScripts.

Step 5 — Get and decode related txs

Connectors:

curl -s "http://localhost:7070/v1/indexer/commitmentTx/{commitment_txid}/connectors" | jq
CONN_PSBT=$(curl -s "http://localhost:7070/v1/indexer/virtualTx/{connector_txid}" | jq -r '.txs[0]')
noa psbt decode "$CONN_PSBT"

Forfeits:

curl -s "http://localhost:7070/v1/indexer/commitmentTx/{commitment_txid}/forfeitTxs" | jq
FORFEIT_PSBT=$(curl -s "http://localhost:7070/v1/indexer/virtualTx/{forfeit_txid}" | jq -r '.txs[0]')
noa psbt decode "$FORFEIT_PSBT"

Forfeit tx structure: input[0] = VTXO, input[1] = connector dust → single ASP sweep output.

Sweep (if swept):

curl -s "http://localhost:7070/v1/indexer/batch/{commitment_txid}/{batch_vout}/sweepTxs" | jq

Step 6 — Decode scripts from PSBT outputs

Extract pkScript hex from noa psbt decode output, then if it's a tapscript leaf (not P2TR):

noa script <closure_script_hex>

Note: noa script decodes Ark closure scripts (MultisigClosure, CSV, CLTV, Condition variants). It does NOT decode P2TR output scripts — those are just OP_1 <tapkey>.

Other Debugging Workflows

1. Inspect a VTXO address: noa address <ark_addr> → get tapkey and pkScript
2. Decode an unknown closure: noa script <hex> → identify closure type and keys
3. Verify a note: noa note fromTxid <txid> → compare derived tapkey against on-chain output
4. Inspect taptree: noa taptree decode <hex> → see all leaf scripts and derived pkScript
5. Debug a round PSBT: noa psbt decode <base64> → inspect Ark PSBT fields (cosigner keys, VTXO trees, expiries)