ootle

A modern, async-first Python client library for the Tari L2 network (codename Ootle). It is the Pythonic counterpart to the Rust crate ootle-rs and the JavaScript package @tari-project/ootle-wasm.

Status: pre-1.0. The 0.x.y API may shift; every breaking change is recorded in CHANGELOG.md.

Install

pip install ootle-py
# or
uv add ootle-py

The distribution name on PyPI is ootle-py; you import it as ootle:

from ootle import AsyncOotleClient, OotleClient

Requirements: Python >= 3.13. The package is pure-Python; the Tari WASM crypto blob ships inside the wheel — no native build step, and the same py3-none-any wheel runs everywhere.

Quick start: read-only query

Connect to a LocalNet indexer and read an account balance. No wallet is needed for read-only queries.

import asyncio
from ootle import (
    AsyncOotleClient, ComponentAddress, Network,
    ResourceAddress, TARI_TOKEN, default_indexer_url,
)


async def main() -> None:
    account = ComponentAddress("component_...your-address...")
    async with AsyncOotleClient.connect(default_indexer_url(Network.LOCAL_NET)) as client:
        balance = await client.get_account_balance(account, ResourceAddress(TARI_TOKEN))
        print(f"TARI balance: {balance}")
        for resource, amount in (await client.get_account_balances(account)).items():
            print(f"  {resource}: {amount}")


asyncio.run(main())

Full version: examples/balance_query.py (and the sync mirror, examples/balance_query_sync.py).

Quick start: public transfer

Faucet a fresh sender, then transfer TARI to a fresh recipient, watching each transaction to finalisation. Note that seal_transaction is synchronous — only the I/O calls are awaited.

import asyncio
from ootle import (
    AsyncOotleClient, LocalSigner, Network, OotleSecretKey,
    OotleWallet, ResourceAddress, TARI, TARI_TOKEN, default_indexer_url,
)


async def main() -> None:
    sender = OotleSecretKey.random(Network.LOCAL_NET)
    wallet = OotleWallet(default=LocalSigner(sender))
    resource = ResourceAddress(TARI_TOKEN)
    async with AsyncOotleClient.connect(
        default_indexer_url(Network.LOCAL_NET), wallet=wallet
    ) as client:
        # Faucet the public XTR faucet's fixed dispense into the sender.
        funded = await client.faucet().take_funds().pay_fee(500).prepare()
        await (await client.send_transaction(client.seal_transaction(funded))).watch()

        # Transfer 2 TARI to a fresh recipient.
        recipient = OotleSecretKey.random(Network.LOCAL_NET).to_address()
        unsigned = await (
            client.account()
            .pay_fee(1000)
            .public_transfer(recipient, resource, 2 * TARI)
            .prepare()
        )
        sealed = client.seal_transaction(unsigned)
        await (await client.send_transaction(sealed)).watch()


asyncio.run(main())

Register extra signers with wallet.register(LocalSigner(...)) and they are folded in automatically at seal time (multi-signer co-authorisation); manual_co_signing.py shows the explicit authorize → attach → seal hand-off for remote-signer / HSM setups. Estimate fees first with await client.send_dry_run(unsigned). Full file: examples/fungible_transfer.py.

Stealth (confidential) transfers

Confidential transfers run entirely on the vendored ootle-wasm blob — the default crypto provider. Bulletproofs, ElGamal viewable balances, balance-proof signatures, and input-mask aggregation all execute locally; no wallet daemon or external service is required.

Build the transfer, hydrate the balance proof with an AsyncWalletStealthAuthorizer, then seal with the wallet's default signer:

import asyncio
from ootle import (
    AsyncOotleClient, AsyncStealthTransfer, AsyncWalletStealthAuthorizer,
    LocalSigner, Network, OotleSecretKey, OotleWallet, Output,
    ResourceAddress, TARI, TARI_TOKEN, default_indexer_url,
)


async def main() -> None:
    sender = OotleSecretKey.random(Network.LOCAL_NET)
    wallet = OotleWallet(default=LocalSigner(sender))
    resource = ResourceAddress(TARI_TOKEN)
    recipient = OotleSecretKey.random(Network.LOCAL_NET).to_address()
    async with AsyncOotleClient.connect(
        default_indexer_url(Network.LOCAL_NET), wallet=wallet
    ) as client:
        # ... faucet the sender first (see examples/stealth/) ...
        transfer = AsyncStealthTransfer(client, resource)
        transfer.spend_revealed_input(sender.to_address().to_component_address(), 5 * TARI)
        transfer.to_stealth_output(
            Output(destination=recipient, amount=4 * TARI, resource_address=resource)
        )
        transfer.to_revealed_output(TARI)
        transfer.pay_fee_from_revealed(500)

        spec = await transfer.prepare()
        authorizer = AsyncWalletStealthAuthorizer(
            wallet, spec, view_secret=sender.view_secret
        )
        hydrated = await authorizer.prepare(client)
        sealed = client.seal_transaction(hydrated.unsigned)
        await (await client.send_transaction(sealed)).watch()


asyncio.run(main())

Stealth supports revealed and stealth inputs and outputs, mixed in one transfer: spend_revealed_input / spend_stealth_input (with input-mask aggregation) feed to_stealth_output / to_revealed_output, with fees paid from a revealed bucket (pay_fee_from_revealed) or a stealth account's revealed vault (pay_fee_from_stealth). The public faucet has a stealth path too (IFaucet.take_funds_stealth), and owned UTXOs are read back with AsyncOotleClient.decrypt_owned_utxo (AEAD owner-read).

The full set of runnable stealth examples — faucet deposit, stealth↔revealed, stealth↔stealth, spending an owned UTXO, and the sync mirror — lives in examples/stealth/.

Sync vs. async

Every async API has a sync mirror with the same shape. Swap the imports and drop the awaits:

from ootle import OotleClient                  # sync
from ootle import AsyncOotleClient             # async

The sync names mirror the async ones — IAccount / IAsyncAccount, StealthTransfer / AsyncStealthTransfer, PendingTransaction / AsyncPendingTransaction, and so on. The sync tree is generated from the async source by scripts/unasync.py and committed; CI asserts the two trees stay byte-identical. Both ship in the wheel.

Running the examples

The examples are self-contained — each generates fresh keys and faucets its own funds against a LocalNet indexer:

OOTLE_INDEXER_URL=http://localhost:12500 \
uv run python -m examples.fungible_transfer

See examples/README.md and examples/stealth/README.md for the full catalogue and the few examples that need an external artifact (a deployed template, a live component to watch, …).

Logging

Every internal module emits diagnostics under the ootle.* logger namespace. The library installs a NullHandler on ootle so unconfigured callers see nothing; opt in by configuring logging:

import logging
logging.basicConfig(level=logging.INFO)
logging.getLogger("ootle").setLevel(logging.DEBUG)

Useful sub-namespaces:

• ootle._async._transport / ootle._sync._transport — request paths.
• ootle._async._watcher / ootle._sync._watcher — SSE open/close, fallbacks.
• ootle._async._resolver / ootle._sync._resolver — chunked substate fetches.
• ootle._crypto._wasm_runtime — WASM blob load + SHA-256 verification.
• ootle.wallet — multi-signer co-authorisation traces.

Scope

In v1: read-only queries · the public XTR faucet · public transfers (IAccount) · multi-signer co-authorisation · the untyped component DSL (IComponent.call_function / call_method) · dry-run fee estimation · transaction and component event watching · confidential stealth transfers (revealed + stealth inputs/outputs, input-mask aggregation, the faucet stealth path, and UTXO read helpers), all backed by the vendored WASM blob.

Not in v1:

• Typed templates / ootle_template! — only the untyped IComponent path ships; there is no codegen for typed bindings.
• HD wallets, BIP-32, mnemonics — caller-application concerns.
• Borsh in Python — all Borsh encoding/decoding is delegated to the WASM blob, never reimplemented in Python.

Contributing

The engineering contract — including the 200-line file limit and the strict typing rules — is in CLAUDE.md.

make sync          # bootstrap the venv
make ci            # the gate the pipeline runs
make unasync       # regenerate src/ootle/_sync/ from _async/

After any change under src/ootle/_async/, run make unasync and commit the regenerated _sync/ mirror in the same commit — make ci fails on drift.

License & acknowledgements

Released under the BSD 3-Clause license — see LICENSE.

The vendored WASM blob is built from @tari-project/ootle-wasm and ships inside the wheel under src/ootle/_crypto/wasm/ootle_wasm_bg.wasm, with its upstream version and SHA-256 recorded in VERSION and verified at load.