FROST Guide
Threshold RedPallas: FROST and its Zcash integration surfaces

Abstract

Assuming Schnorr signatures from the Crypto Guide, RedPallas from the Ironwood Guide, PCZT from the Wallet Guide, and the finalizer model from the Crosslink Guide, this volume of The Zcash Arboretum documents threshold signing for Zcash. It constructs FROST as specified in RFC 9591, then its re-randomised form for Zcash spend authorisation and recoverability custody. The re-randomised Zcash stack is outside the completed cryptographic-library audits identified here; each design-stage claim is classified by the rigour of its source.