Computer

The Computer class is the main client API for the Bitcoin Computer. Methods are grouped below. Prefer the query helpers under Query outputs over the deprecated query.

Basic

You can build almost all smart contracts with these.

Method	Description
constructor	Creates an instance of class Computer
new	Creates a smart object from a smart contract
getOUTXOs	Unspent smart-object revisions (preferred replacement for query)
sync	Computes the state of a smart object from a revision (or an effect from a tx id)

Modules

Deploy JavaScript modules (preferably via taproot) to avoid redundant on-chain storage for smart contracts, keep using expressions tiny, and minimize on-chain technical dust / hygiene dust costs. See Fees for details and best practices.

Method	Description
deploy	Deploys a JavaScript module on the blockchain
load	Loads and evaluates a module (returns exports)
getModules	Lists module deploys indexed by the node
getModule	Fetches one indexed module row (including source ept)
getInscription	Static helper: parse a taproot BC module witness from raw tx hex

Query outputs

Query the node’s Output table. All of these accept a TXOQuery (see getTXOs). verbosity: 0 (default) returns revision strings; verbosity: 1 returns full rows.

Method	Description
getTXOs	Transaction outputs matching the query
getUTXOs	Unspent outputs (isSpent: false)
getOTXOs	Smart-object outputs (isObject: true)
getOUTXOs	Unspent smart objects (isObject: true, isSpent: false)

Advanced encode / decode

For applications that need control over signing, UTXOs spent, custom scripts, or collaborative transaction building.

Method	Description
encode	Encodes a JavaScript expression into a Bitcoin transaction
encodeNew	Encodes a constructor call into a Bitcoin transaction
encodeCall	Encodes a function call into a Bitcoin transaction
decode	Parses a transition transaction (exp / env / mod); not for module deploys
fund	Adds inputs/change so a transaction can pay fees
delete	Spends the given smart-object revisions (destroys those UTXOs)

History

Access historical versions of on-chain objects and related graph data.

Method	Description
first	Return the first revision (object id) for a revision
prev	Return the previous revision
next	Return the next revision
latest	Return the latest revision
last	Latest revision if spent; otherwise undefined
spendingInput	Input that spent a given revision
getAncestors	Ancestor transaction ids (or hex map) for a location

Wallet

Access the client-side wallet and node connection.

Method	Description
sign	Signs a Bitcoin transaction
broadcast	Broadcasts a Bitcoin transaction
send	Sends satoshis to an address
faucet	Fund an address on regtest
listTxs	Sent and received transactions for an address
rpc	Call Bitcoin RPC methods via the node
getAddress	Wallet address
getBalance	Confirmed, unconfirmed, and total balance in sats
getChain	Chain (LTC, BTC, …)
getNetwork	Network (mainnet, testnet, regtest)
getUrl	URL of the connected Bitcoin Computer Node
getMnemonic	BIP39 mnemonic
getPassphrase	Wallet passphrase
getPath	BIP32 derivation path
getPrivateKey	Private key (hex/WIF string form used by the wallet)
getPublicKey	Public key (hex)
getFee	Fee rate in sat/byte
setFee	Set fee rate in sat/byte
getVersion	Static: library version string
isUnspent	Whether a revision is still unspent on the chain

Indexer readiness

After broadcast, the node may take a short time to index outputs. Use these when you need strong read consistency before sync / getOUTXOs.

Method	Description
isIndexed	Whether the node has committed Output rows for a tx
waitForIndexed	Poll until indexed (or timeout)

Real-time (SSE)

Method	Description
subscribe	Updates for a smart-object id
streamTXOs	Stream outputs matching a filter
streamMempoolCleanup	Notifications when stale mempool rows are removed

Deprecated

Still present for backward compatibility; prefer the replacements.

Method	Prefer instead
query	getOUTXOs
getUtxos	getUTXOs with { address, isObject: false } (wallet-level helper)