# input-output-hk/cardano-sl

Cryptographic currency implementing Ouroboros PoS protocol

Repository: https://github.com/input-output-hk/cardano-sl
Canonical: https://ross.abutalabs.com/products/cardano-sl
Language: Haskell
License: Apache-2.0
License Family: permissive
Topics: haskell, stake-blockchain-protocol, cryptocurrency
Archived: true
Last push: 2020-07-30T15:22:04+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3610, "days_push": 2225, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3746, forks 614 (observed 2026-08-28T04:08:16.106432+00:00)

## What it is
Cardano SL is the original Haskell implementation of the Cardano cryptocurrency, implementing the Ouroboros proof-of-stake consensus protocol. The codebase is deprecated and superseded by the modular Shelley-era components such as cardano-node and cardano-wallet.

## Use cases
- run a Cardano proof-of-stake blockchain node
- study the Ouroboros consensus protocol implementation
- explore legacy Cardano SL source code
- research proof-of-stake cryptocurrency design in Haskell

## When to choose
- you need to read or audit the original Ouroboros PoS implementation
- you are researching the history of Cardano's codebase

## When to avoid
- you want to run or build on Cardano today - use cardano-node and related components instead
- you need an actively maintained blockchain node
- you want Shelley-era features or current wallet support

## Facets
- artifact type: application
- maturity: abandoned
- function: cryptography, networking, cli
- domain: blockchain, microservices
- platform: windows, cross-platform
- tags: cardano, ouroboros, proof-of-stake, blockchain-node, deprecated, haskell, cryptocurrency, linux, macos

## Member repositories
- input-output-hk/cardano-sl (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:16.106432+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 2026-08-29T18:29:02.973556+00:00, confidence not recorded.
  - readme: https://github.com/input-output-hk/cardano-sl (fetched 2026-08-28T04:08:16.106432+00:00, sha b12870750c41)
- Data as of 2026-08-30T08:39:29.467469+00:00.