Starknet:
- Initial support of Cairo1.0 contracts:
- New declare transaction version for declaring Cairo1.0 contracts
- Changes to on-chain data format. Include the Cairo1.0 declared classes and changes to the class hash of a given contract instance. See more information here
- Support for Poseidon hash (only in Cairo0 contracts)
Cairo:
- New builtins:
- Poseidon hash function (efficient, STARK-friendly hash function)
- Keccak hash function (currently, the keccak builtin cannot be used in Starknet)