This library is a Golang implementation of {2,n}-threshold ECDSA and Ed25519.

This library supports the following functions:

• 2-party ECDSA signature, using Feldman's VSS generate key shares and Lindell 17 protocol for 2-party signature.

• 2-party Ed25519 signature.

• Bip32 key derivation, support key share unhardened derivation, chaincode is generated by n parties.

• Key share refresh, when one party key share is lost or a new participant comes in, support refresh.

See the Threshold Signature Scheme for more detailed information about the library.

Extentions to allow deterministic usage of the elliptic curve digital signature algorithm following the RFC 6979 standard.

• Step1_with_rfc6979(...), deterministic signature
• Step3_with_Recoveryid(...), returns r,s and the recovery id

Apache-2.0 license