# zkcrypto/bellman

zk-SNARK library.

Repository: https://github.com/zkcrypto/bellman
Canonical: https://ross.abutalabs.com/products/bellman
Language: Rust
License: NOASSERTION
License Family: other
Last push: 2026-02-25T09:50:29+00:00

## Health v2 (maintenance only)
Score: 63/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 69, release rhythm 35, longevity 100
- inputs: {"age_days": 3905, "days_push": 189, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1127, forks 555 (observed 2026-08-28T04:03:41.375489+00:00)

## What it is
bellman is a Rust crate for building zk-SNARK circuits, providing circuit traits, primitive structures, and gadgets like booleans and number abstractions. It bundles a Groth16 proving system implementation and works generically over scalar field types via the ff and group crates.

## Use cases
- build zk-SNARK circuits in Rust
- generate and verify Groth16 zero-knowledge proofs
- implement private transactions for blockchain protocols
- create arithmetic circuits over a prime scalar field
- develop custom proving systems using circuit utilities

## When to choose
- you need a mature, widely-used Rust library for Groth16 zk-SNARKs
- you want generic circuit building over pluggable scalar fields
- you are building privacy-preserving blockchain or cryptographic applications in Rust

## When to avoid
- you need a higher-level zk DSL like Circom or Noir rather than a low-level Rust crate
- you require proving systems other than Groth16 without extra work
- your project is not in Rust

## Facets
- artifact type: library
- maturity: stable
- function: cryptography, security, developer-tools
- domain: blockchain, privacy
- platform: rust, cross-platform
- tags: zk-snark, zero-knowledge-proofs, groth16, circuit-building, rust-crate, cryptography, algorithms

## Member repositories
- zkcrypto/bellman (main) score 63

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:41.375489+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:39:10.540288+00:00, confidence not recorded.
  - readme: https://github.com/zkcrypto/bellman (fetched 2026-08-28T04:03:41.375489+00:00, sha 5c1828d12d3f)
  - registry_crates: https://crates.io/api/v1/crates/bellman (fetched 2026-08-29T12:43:29.647267+00:00, sha 440b68ff6e6d)
- Data as of 2026-08-30T08:39:29.467469+00:00.