feat: SRC20 wallet + public actions

[ameya-deshmukh]

Note

Adds SRC20 ABIs, directory key utilities, and event-watching actions (public/wallet) with decryption, integrated into clients and exports; bumps seismic-viem to 1.0.54.

• seismic-viem (core):
  • ABIs: Add @sviem/abis/src20.ts and @sviem/abis/directory.ts (with DIRECTORY_ADDRESS).
  • SRC20 Actions:
    • Public: watchSRC20EventsWithKey via src20PublicActions.
    • Wallet: watchSRC20Events via src20WalletActions.
    • Event decryption using AES (filters by encryptKeyHash).
  • Directory Helpers: checkRegistration, getKeyHash, getKey (signed read), registerKey (timeout), computeKeyHash.
  • Crypto Util: parseEncryptedData for ciphertext/nonce parsing.
  • Client Integration: Extend ShieldedPublicClient/ShieldedWalletClient with SRC20 actions; wire into createShieldedPublicClient and getSeismicClients.
  • Exports: Re-export SRC20 actions/types, directory helpers, and ABIs from src/index.ts.
  • Version: Bump seismic-viem to 1.0.54.

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Bug: BigInt('0x') throws SyntaxError for empty decrypted data

When aesCipher.decrypt returns '0x' for empty ciphertext, calling BigInt(decryptedAmount) throws a SyntaxError because '0x' is not a valid BigInt literal—it requires at least one digit after the prefix like '0x0'. This can occur if the encrypted data contains only a nonce with no ciphertext, causing parseEncryptedData to return an empty ciphertext. The error is caught and passed to onError, but a zero amount should return 0n rather than triggering an error callback.

Additional Locations (1)

• packages/seismic-viem/src/actions/src20/watchSRC20EventsWithKey.ts#L56-L57