Types

Data types for SRC20 event watching

Frozen dataclasses for decoded SRC20 events and callback type aliases.

Event Data Types

Type	Description
DecryptedTransferLog	Transfer event with decrypted amount
DecryptedApprovalLog	Approval event with decrypted amount

Callback Type Aliases

# Sync
TransferCallback = Callable[[DecryptedTransferLog], None]
ApprovalCallback = Callable[[DecryptedApprovalLog], None]
ErrorCallback = Callable[[Exception], None]

# Async
AsyncTransferCallback = Callable[[DecryptedTransferLog], Awaitable[None]]
AsyncApprovalCallback = Callable[[DecryptedApprovalLog], Awaitable[None]]
AsyncErrorCallback = Callable[[Exception], Awaitable[None]]

Common Fields

Both event types share these fields:

Field	Type	Description
encrypt_key_hash	bytes	32-byte keccak256 of the viewing key (event topic)
encrypted_amount	bytes	Raw AES-GCM ciphertext with auth tag
decrypted_amount	int	Decrypted token amount (raw — consider decimals)
transaction_hash	HexBytes	Transaction containing the event
block_number	int	Block containing the event

See Also

• Event Watching — Watch and decrypt SRC20 events

• Intelligence Providers — Manage viewing keys