# exonum/exonum

An extensible open-source framework for creating private/permissioned blockchain applications

Repository: https://github.com/exonum/exonum
Canonical: https://ross.abutalabs.com/products/exonum
Homepage: https://exonum.com
Language: Rust
License: Apache-2.0
License Family: permissive
Topics: blockchain, rust, cryptography, bitcoin, p2p, consensus-algorithm, byzantine, database
Last push: 2024-02-25T19:27:29+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3499, "days_push": 920, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1245, forks 245 (observed 2026-08-28T04:04:06.983556+00:00)

## What it is
Exonum is an extensible open-source Rust framework for building private, permissioned blockchain applications with a custom Byzantine fault-tolerant consensus algorithm. It provides modular crates for the core ledger, node implementation, cryptography, merkelized storage, HTTP APIs, and SDKs for writing services in Rust and Java.

## Use cases
- build a private permissioned blockchain for asset management
- create a tamper-proof land registry or e-auction ledger
- implement a supply chain tracking blockchain
- write smart contract services in Rust or Java on a distributed ledger
- anchor a private blockchain's state to the Bitcoin blockchain
- build a cryptocurrency application with cryptographic proofs
- run a high-throughput ledger with fast transaction finality

## When to avoid
- you need a public, permissionless blockchain with open validator participation
- you want a general-purpose smart contract platform with a large ecosystem like Ethereum
- your team is not comfortable with Rust or Java service development
- you need a turnkey product rather than a framework requiring custom development

## Facets
- artifact type: framework
- maturity: maintenance
- function: cryptography, database, networking, cli, testing, serialization
- domain: blockchain, microservices, security, fintech, developer-tools
- platform: windows, rust, cross-platform
- tags: permissioned-blockchain, byzantine-fault-tolerance, consensus, distributed-ledger, smart-contracts, merkle-trees, java-sdk, light-client, linux, macos

## Member repositories
- exonum/exonum (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:06.983556+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 2026-08-30T05:08:09.409800+00:00, confidence not recorded.
  - readme: https://github.com/exonum/exonum (fetched 2026-08-28T04:04:06.983556+00:00, sha 04fa2a1a65ec)
  - homepage: https://exonum.com (fetched 2026-08-29T12:19:40.505634+00:00, sha 8abff4f8ab7c)
  - site_page: https://exonum.com/about.html (fetched 2026-08-29T12:19:40.515035+00:00, sha dec17a4a8a22)
  - registry_crates: https://crates.io/api/v1/crates/exonum (fetched 2026-08-29T12:19:40.521329+00:00, sha 61e5f617e6e9)
  - site_page: https://exonum.com/faq.html (fetched 2026-08-29T12:19:40.517332+00:00, sha ad2aa158281e)
  - site_page: https://exonum.com/doc/version/latest (fetched 2026-08-29T12:19:40.519705+00:00, sha ccabb5511b99)
- Data as of 2026-08-30T08:39:29.467469+00:00.