AsyncShieldedContract

Async contract wrapper with shielded and transparent namespaces

Asynchronous contract wrapper providing encrypted and transparent interaction with Seismic contracts.

Overview

AsyncShieldedContract is the async version of ShieldedContract, providing the same five namespaces (.write, .read, .twrite, .tread, .dwrite) but with coroutine-based methods. All namespace methods return coroutines that must be awaited. Use this class in async/await applications for non-blocking contract interactions.

Definition

class AsyncShieldedContract:
    def __init__(
        self,
        w3: AsyncWeb3,
        encryption: EncryptionState,
        private_key: PrivateKey,
        address: ChecksumAddress,
        abi: list[dict[str, Any]],
        eip712: bool = False,
    ) -> None:
        ...

Constructor Parameters

Parameter	Type	Required	Description
w3	AsyncWeb3	Yes	Asynchronous AsyncWeb3 instance connected to Seismic RPC
encryption	EncryptionState	Yes	Encryption state for shielded operations
private_key	PrivateKey	Yes	32-byte secp256k1 private key for signing transactions
address	ChecksumAddress	Yes	Contract address (checksummed Ethereum address)
abi	list[dict[str, Any]]	Yes	Contract ABI (list of function entries)
eip712	bool	No	Use EIP-712 typed data signing (default: False)

Namespaces

.write - Encrypted Write

Sends encrypted transactions using TxSeismic (type 0x4a). Calldata is encrypted before broadcast.

Returns: Coroutine[HexBytes] (transaction hash)

Positional Arguments: *args - ABI function arguments (e.g. await contract.write.transfer(to, amount))

Optional Parameters:

• value: int - Wei to send (default: 0)

• gas: int | None - Gas limit (default: 30_000_000 when omitted)

• gas_price: int | None - Gas price in wei (default: network suggested)

• security: [SeismicSecurityParams](../api-reference/transaction-types/seismic-security-params.md) | None - Security parameters for expiry

.read - Encrypted Read

Executes encrypted signed eth_call with encrypted calldata. Result is decrypted and ABI-decoded by the SDK. Single-output functions return the value directly (e.g. int, bool); multi-output functions return a tuple.

Returns: Coroutine[Any] (ABI-decoded Python value)

Positional Arguments: *args - ABI function arguments (e.g. await contract.read.balanceOf(owner))

Optional Parameters:

• value: int - Wei for call context (default: 0)

• gas: int - Gas limit (default: 30_000_000)

• security: [SeismicSecurityParams](../api-reference/transaction-types/seismic-security-params.md) | None - Security parameters for expiry

.twrite - Transparent Write

Sends standard async eth_sendTransaction with unencrypted calldata.

Returns: Coroutine[HexBytes] (transaction hash)

Positional Arguments: *args - ABI function arguments

Optional Parameters:

• value: int - Wei to send (default: 0)

• **tx_params: Any - Additional transaction parameters (gas, gasPrice, etc.)

.tread - Transparent Read

Executes standard async eth_call with unencrypted calldata. Result is ABI-decoded by the SDK. Single-output functions return the value directly; multi-output functions return a tuple.

Returns: Coroutine[Any] (ABI-decoded Python value)

Positional Arguments: *args - ABI function arguments

.dwrite - Debug Write

Like .write but returns debug information including plaintext and encrypted views. Transaction is actually broadcast.

Returns: Coroutine[DebugWriteResult] (DebugWriteResult)

Positional Arguments: *args - ABI function arguments

Optional Parameters: Same as .write

Examples

Basic Encrypted Write

import asyncio
from seismic_web3 import create_async_wallet_client, AsyncShieldedContract

async def main():
    w3 = await create_async_wallet_client(
        provider_url="https://testnet-1.seismictest.net/rpc",
        private_key=private_key,
    )

    contract = AsyncShieldedContract(
        w3=w3,
        encryption=w3.seismic.encryption,
        private_key=private_key,
        address="0x1234567890123456789012345678901234567890",
        abi=CONTRACT_ABI,
    )

    # Encrypted write - must await
    tx_hash = await contract.write.setNumber(42)
    print(f"Transaction: {tx_hash.to_0x_hex()}")

    # Wait for confirmation
    receipt = await w3.eth.wait_for_transaction_receipt(tx_hash)
    print(f"Status: {receipt['status']}")

asyncio.run(main())

Encrypted Read

async def read_example(contract: AsyncShieldedContract):
    # Encrypted read — auto-decoded, must await
    number = await contract.read.getNumber()  # int
    print(f"Number: {number}")

Transparent Operations

async def transparent_example(contract: AsyncShieldedContract, w3: AsyncWeb3):
    # Transparent write - calldata visible on-chain
    tx_hash = await contract.twrite.setNumber(42)
    receipt = await w3.eth.wait_for_transaction_receipt(tx_hash)
    print(f"Status: {receipt['status']}")

    # Transparent read — standard eth_call, auto-decoded
    number = await contract.tread.getNumber()
    print(f"Result: {number}")

Debug Write

async def debug_example(contract: AsyncShieldedContract, w3: AsyncWeb3):
    # Debug write - returns plaintext and encrypted views
    debug_result = await contract.dwrite.transfer("0xRecipient...", 1000)

    print(f"Transaction hash: {debug_result.tx_hash.to_0x_hex()}")
    print(f"Plaintext data: {debug_result.plaintext_tx.data.to_0x_hex()}")
    print(f"Encrypted data: {debug_result.shielded_tx.data.to_0x_hex()}")

    # Transaction is actually broadcast
    receipt = await w3.eth.wait_for_transaction_receipt(debug_result.tx_hash)
    print(f"Confirmed in block: {receipt['blockNumber']}")

Concurrent Operations

async def concurrent_example(contract: AsyncShieldedContract):
    # Execute multiple reads concurrently — each is auto-decoded
    balances = await asyncio.gather(
        contract.tread.balanceOf("0xAddress1..."),
        contract.tread.balanceOf("0xAddress2..."),
        contract.tread.balanceOf("0xAddress3..."),
    )

    for i, balance in enumerate(balances):
        print(f"Balance {i}: {balance}")

With Transaction Parameters

async def advanced_write(contract: AsyncShieldedContract):
    # Custom gas and value
    tx_hash = await contract.write.deposit(
        value=10**18,  # 1 ETH
        gas=200_000,
        gas_price=20 * 10**9,  # 20 gwei
    )

    # With security parameters
    from seismic_web3.transaction_types import SeismicSecurityParams

    security = SeismicSecurityParams(blocks_window=100)
    tx_hash = await contract.write.withdraw(
        amount,
        security=security,
    )

Batch Processing

async def batch_writes(contract: AsyncShieldedContract, recipients: list[str]):
    # Send multiple transactions concurrently
    tx_hashes = await asyncio.gather(
        *[contract.write.transfer(recipient, 100) for recipient in recipients]
    )

    print(f"Sent {len(tx_hashes)} transactions")

    # Wait for all confirmations
    receipts = await asyncio.gather(
        *[w3.eth.wait_for_transaction_receipt(tx_hash) for tx_hash in tx_hashes]
    )

    successful = sum(1 for r in receipts if r['status'] == 1)
    print(f"{successful}/{len(receipts)} successful")

Using EIP-712 Signing

async def eip712_example():
    w3 = await create_async_wallet_client(...)

    # Enable EIP-712 for typed data signing
    contract = AsyncShieldedContract(
        w3=w3,
        encryption=w3.seismic.encryption,
        private_key=private_key,
        address=contract_address,
        abi=CONTRACT_ABI,
        eip712=True,  # Use EIP-712 instead of raw signing
    )

    tx_hash = await contract.write.setNumber(123)

Instantiation via Async Client

async def client_pattern():
    # Most common pattern - let the client create the contract
    w3 = await create_async_wallet_client(
        provider_url="https://testnet-1.seismictest.net/rpc",
        private_key=private_key,
    )

    # Client's contract() method creates AsyncShieldedContract
    contract = w3.seismic.contract(address=contract_address, abi=CONTRACT_ABI)

    # Now use any namespace (must await)
    tx_hash = await contract.write.setNumber(42)

Error Handling

async def error_handling(contract: AsyncShieldedContract):
    try:
        tx_hash = await contract.write.withdraw(123)
        receipt = await w3.eth.wait_for_transaction_receipt(tx_hash)

        if receipt['status'] != 1:
            print("Transaction failed on-chain")
    except ValueError as e:
        print(f"RPC error: {e}")
    except Exception as e:
        print(f"Unexpected error: {e}")

Context Manager Pattern

async def context_pattern():
    async with create_async_wallet_client(...) as w3:
        contract = AsyncShieldedContract(...)

        tx_hash = await contract.write.setNumber(42)
        receipt = await w3.eth.wait_for_transaction_receipt(tx_hash)
    # Connection automatically closed

Notes

• All methods return coroutines: Must use await with every namespace call

• Concurrent operations: Use asyncio.gather() for parallel reads/writes

• Dynamic method access: Contract methods resolved via __getattr__ at runtime

• ABI remapping: Shielded types automatically remapped (same as sync version)

• Connection pooling: AsyncWeb3 can reuse connections for better performance

• Gas defaults: .write uses 30_000_000 when gas is omitted; .twrite follows normal web3.py/provider transaction behavior

• EIP-712 vs raw: Same signing options as sync version

• Error handling: Use try/except around await calls for RPC errors

See Also

• ShieldedContract - Synchronous version of this class

• AsyncPublicContract - Async read-only contract wrapper

• create_async_wallet_client - Create async client

• EncryptionState - Manages encryption keys

• DebugWriteResult - Debug write return type

• SeismicSecurityParams - Transaction expiry parameters

• Contract Namespaces - Detailed namespace documentation