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Sourced from o1js's changelog.

1.6.0 - 2024-07-23

Added

• SmartContract.emitEventIf() to conditionally emit an event o1-labs/o1js#1746

Changed

• Reduced maximum bit length for xor, not, and and, operations from 254 to 240 bits to prevent overflow vulnerabilities. o1-labs/o1js#1745
• Allow using Type instead of Type.provable in APIs that expect a provable type o1-labs/o1js#1751
  • Example: Provable.witness(Bytes32, () => bytes)
• Automatically wrap and unwrap Unconstrained in fromValue and toValue, so that we don't need to deal with "unconstrained" values outside provable code o1-labs/o1js#1751

1.5.0 - 2024-07-09

Breaking changes

• Fixed a vulnerability in OffchainState where it didn't store the IndexedMerkleTree length onchain and left it unconstrained o1-labs/o1js#1676

Added

• A warning about the current reducer API limitations, as well as a mention of active work to mitigate them was added to doc comments and examples o1-labs/o1js#1728
• ForeignField-based representation of scalars via ScalarField o1-labs/o1js#1705
• Introduced new V2 methods for nullifier operations: isUnusedV2(), assertUnusedV2(), and setUsedV2() o1-labs/o1js#1715
• Int64.create() method for safe instance creation with canonical zero representation o1-labs/o1js#1735
• New V2 methods for Int64 operations: fromObjectV2, divV2() o1-labs/o1js#1735
• Experimental.BatchReducer to reduce actions in batches o1-labs/o1js#1676
  • Avoids the account update limit
  • Handles arbitrary numbers of pending actions thanks to recursive validation of the next batch
• Add conditional versions of all preconditions: .requireEqualsIf() o1-labs/o1js#1676
• AccountUpdate.createIf() to conditionally add an account update to the current transaction o1-labs/o1js#1676
• IndexedMerkleMap.setIf() to set a key-value pair conditionally o1-labs/o1js#1676
• Provable.assertEqualIf() to conditionally assert that two values are equal o1-labs/o1js#1676
• Add offchainState.setContractClass() which enables us to declare the connected contract at the top level, without creating a contract instance o1-labs/o1js#1676
  • This is enough to call offchainState.compile()
• More low-level methods to interact with MerkleList o1-labs/o1js#1676
  • popIfUnsafe(), toArrayUnconstrained() and lengthUnconstrained()

Changed

• Improve error message when o1js global state is accessed in an invalid way o1-labs/o1js#1676
• Start developing an internal framework for local zkapp testing o1-labs/o1js#1676
• Internally upgrade o1js to TypeScript 5.4 o1-labs/o1js#1676

Deprecated

• Deprecated Nullifier.isUnused(), Nullifier.assertUnused(), and Nullifier.setUsed() methods o1-labs/o1js#1715
• createEcdsa, createForeignCurve, ForeignCurve and EcdsaSignature deprecated in favor of V2 versions due to a security vulnerability found in the current implementation o1-labs/o1js#1703
• Int64 constructor, recommending Int64.create() instead o1-labs/o1js#1735
• Original div() and fromObject, methods in favor of V2 versions o1-labs/o1js#1735

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