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Redirect to snark-verifier and add more context on why this is rebuilt #10

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Dec 12, 2023
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Redirect to snark-verifier and add more context on why this is rebuilt #10

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doc: redirect to `snark-verifier` and add more context on why this is…
han0110 Dec 12, 2023
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17 changes: 14 additions & 3 deletions README.md
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Expand Up @@ -2,7 +2,9 @@

> ⚠️ This repo has NOT been audited and is NOT intended for a production environment yet.

Solidity verifier generator for [`halo2`](http://github.com/privacy-scaling-explorations/halo2) proof with KZG polynomial commitment scheme on BN254
Solidity verifier generator for [`halo2`](http://github.com/privacy-scaling-explorations/halo2) proof with KZG polynomial commitment scheme on BN254.

For audited solidity verifier generator and proof aggregation toolkits, please refer to [`snark-verifier`](http://github.com/axiom-crypto/snark-verifier).

## Usage

Expand Down Expand Up @@ -30,16 +32,25 @@ let calldata = encode_calldata(vk_address, &proof, &instances);

Note that function selector is already included.

## Limitations
## Limitations & Caveats

- It only allows circuit with **exact 1 instance column** and **no rotated query to this instance column**.
- Currently even the `configure` is same, the [selector compression](https://github.com/privacy-scaling-explorations/halo2/blob/7a2165617195d8baa422ca7b2b364cef02380390/halo2_proofs/src/plonk/circuit/compress_selectors.rs#L51) might lead to different configuration when selector assignments are different. After PR https://github.com/privacy-scaling-explorations/halo2/pull/212 is merged we will have an alternative API to do key generation without selector compression.
- Currently even the `configure` is same, the [selector compression](https://github.com/privacy-scaling-explorations/halo2/blob/7a2165617195d8baa422ca7b2b364cef02380390/halo2_proofs/src/plonk/circuit/compress_selectors.rs#L51) might lead to different configuration when selector assignments are different. To avoid this, please use [`keygen_vk_custom`](https://github.com/privacy-scaling-explorations/halo2/blob/6fc6d7ca018f3899b030618cb18580249b1e7c82/halo2_proofs/src/plonk/keygen.rs#L223) with `compress_selectors: false` to do key generation without selector compression.
- Now it only supports BDFG21 batch open scheme (aka SHPLONK), GWC19 is not yet implemented.

## Compatibility

The [`Keccak256Transcript`](./src/transcript.rs#L19) behaves exactly same as the `EvmTranscript` in `snark-verifier`.

## Design Rationale

The current solidity verifier generator within `snark-verifier` faces a couple of issues:

- The generator receives only unoptimized, low-level operations, such as add or mul. As a result, it currently unrolls all assembly codes, making it susceptible to exceeding the contract size limit, even with a moderately sized circuit.
- The existing solution involves complex abstractions and APIs for consumers.

This repository is a ground-up rebuild, addressing these concerns while maintaining a focus on code size and readability. Remarkably, the gas cost is comparable, if not slightly lower, than the one generated by `snark-verifier`.

## Acknowledgement

The template is heavily inspired by Aztec's [`BaseUltraVerifier.sol`](https://github.com/AztecProtocol/barretenberg/blob/4c456a2b196282160fd69bead6a1cea85289af37/sol/src/ultra/BaseUltraVerifier.sol).
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