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CHANGELOG.md

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CHANGELOG

Next (upcoming release)

🔥 Prover Performance Improvements

  • Witness generation has been parallelized by adding another preflight pass.
  • Improved performance by minimizing data transfers when constructing merkle proofs.
  • Parallelized step_verify_bytes function.
  • Changed eval_check to use precomputed powers for poly_mix.

🛠 Fixes

  • Fixed a bug with unaligned short read.
  • Commit globals in Fiat-Shamir transcript.
  • Fixed an undefined behavior warning generated by rust 1.77.2 in guest.
  • Addressed security vulnerabilities in the rv32im circuit.
  • Fix clippy warnings in all published crates.
  • Fix build issues arising from an undefined _end symbol.

⚡️ Features

  • Benchmarks have been improved.
  • A new web app that can be used to display datasheets, prover benchmarks, application benchmarks and supported crates.
  • Added the ability to compile Rust crates that bind to C code.
  • Added a new cargo risczero deploy command to deploy ELF binaries to bonsai.
  • ProverOpts now has a new ReceiptKind field. This is used to select the minimum compression level of receipt to be generated by the Prover and ProverServer traits. The kinds include composite (a receipt containing a vector of segment receipts), succinct (a receipt where all segments have been compressed into a single receipt via the lift and join recursion programs), and compact (a snark receipt generated by compressing a succinct receipt using a groth16 prover. This used for on-chain proving).
  • A compress function has been added to the Prover trait. This allows the users to more easily change receipts to a different kind in the host.
  • Rust's alloc_zeroed function has been optimized in the guest.
  • Export NullSegmentRef for use by host code.
  • Added a soundness error calculator.
  • Bonsai SDK: added a method used to download receipts.
  • Bonsai SDK: improved error messages.
  • Bonsai SDK: added a new API to stop a proving session in Bonsai.

🚨 Breaking Changes

  • Change sys_cycle_count to return a u64 instead of u32.

  • The Prover trait's prove() function now returns a ProveInfo. This struct contains the receipt as well as cycle and segment information gathered during the proof generation. The following is the definition of ProveInfo and SessionStats structs:

/// Information returned by the prover including receipt as well as other information useful for debugging
pub struct ProveInfo {
    /// receipt from the computation
    pub receipt: Receipt,
    /// stats about cycle counts of the execution
    pub stats: SessionStats,
}

/// Struct containing information about a prover's cycle count after running the guest program
pub struct SessionStats {
    /// Count of segments in this proof request
    pub segments: usize,
    /// Total cycles run within guest
    pub total_cycles: u64,
    /// User cycles run within guest
    pub user_cycles: u64,
}

For those upgrading from v0.21.0, the following code change is necessary on the host side to retrieve the receipt.

-   let receipt = prover.prove(env, BEVY_GUEST_ELF).unwrap();
+   let receipt = prover.prove(env, BEVY_GUEST_ELF).unwrap().receipt;

v0.21.0 (2024-03-11)

🛠 Fixes

  • Fix an issue where the temporary directory is not being removed when the Session goes out of scope. This helps prevent the depletion of disk space.

  • Verification of groth16 receipts in rust that are compatible with Bonsai

⚡️ Features

  • Add an improved Poseidon2 hashing function that replaces Poseidon for recursive proofs.

🚨 Breaking Changes

  • For recursive proofs, the Poseidon hash function is replaced by the Poseidon2 hash function. Users can still create receipts using the older Poseidon hash function but these receipts will not be usable by Bonsai or any proof composition or rollup use cases.

v0.20.1 (2024-02-01)

🛠 Fixes

  • Revert change to Prover::prove to return a SuccinctReceipt. This prevents a performance regression for default use cases.

v0.20.0 (2024-01-29)

🛠 Fixes

  • Restrict software ecall handler address range
  • Fix argument handling in client/server mode
  • Change jal to call in zkVM entrypoint #1257
  • Improve ZKR zip file handling

⚡️ Features

  • Support for Proof Composition
  • Add execution statistics when using RUST_LOG=info
  • Add XGBoost example using Spice AI query to train a model
  • Improve CUDA performance by integrating sppark
  • Add Poseidon2 support to CUDA backend
  • Support for verifying Groth16 proofs
  • Add exponential backoff to bonsai proof polling
  • add getrandom feature to toggle getrandom in the guest
  • Adjust Prover::prove to return a SuccinctReceipt by default

🚨 Breaking Changes

  • Rename ReceiptMetadata to ReceiptClaim
  • Drop MemoryImage from the public API
  • Drop _elf suffix from API. For example, Prover::prove_elf is renamed Prover::prove.