# bnb-chain/tss-lib

Threshold Signature Scheme, for ECDSA and EDDSA

Repository: https://github.com/bnb-chain/tss-lib
Canonical: https://ross.abutalabs.com/products/tss-lib
Language: Go
License: MIT
License Family: permissive
Topics: tss, cryptography, blockchain, golang
Last push: 2026-04-09T13:36:58+00:00

## Health v2 (maintenance only)
Score: 70/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 76, release rhythm 46, longevity 100
- inputs: {"age_days": 2671, "days_push": 146, "days_rel": 146, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1037, forks 364 (observed 2026-08-28T04:03:19.418738+00:00)

## What it is
A Go library implementing multi-party threshold signature schemes (TSS) for ECDSA and EdDSA, based on the Gennaro-Goldfeder CCS 2018 protocol. It provides keygen, signing, and resharing protocols so multiple parties can jointly create signatures without any single party holding the full private key.

## Use cases
- implement threshold ECDSA wallets where multiple parties co-sign transactions
- split a private key into shares so no single server holds the full key
- build MPC-based custody for crypto exchanges
- reshare signing keys when participants join or leave a group
- sign blockchain transactions without revealing which parties participated
- replace on-chain multisig with privacy-preserving threshold signatures

## When to choose
- you need t-of-n threshold signing for secp256k1 or Ed25519-style curves in Go
- you want a well-known, MIT-licensed TSS implementation with keygen, signing, and resharing
- you're building non-custodial wallets or custody infrastructure on chains like Bitcoin, Ethereum, or Cardano

## When to avoid
- you need a ready-made CLI or service rather than a developer library
- your signatures don't need threshold or multi-party properties
- you can't follow the library's security implementation notes - misuse can break security guarantees

## Facets
- artifact type: library
- maturity: active
- function: cryptography, security, sdk
- domain: blockchain, security, developer-tools
- platform: go, cross-platform
- tags: threshold-signatures, ecdsa, eddsa, multi-party-computation, mpc, key-management, wallet-security, cryptocurrency

## Member repositories
- bnb-chain/tss-lib (main) score 70

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:19.418738+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 2026-08-30T07:04:22.217665+00:00, confidence not recorded.
  - readme: https://github.com/bnb-chain/tss-lib (fetched 2026-08-28T04:03:19.418738+00:00, sha beef265a9d92)
- Data as of 2026-08-30T08:39:29.467469+00:00.