A basalt sphinx in a night desert, with a gold hash tree set into the stone

Hash-based signatures as a direction for Bitcoin

SHRINCS for Bitcoin

A draft way to authorize a Bitcoin spend with SHA256 alone.

  • SHA256 Alone
  • A Stateful Signature
  • A Stateless Fallback
  • A Roadmap

The ordinary signature is stateful and small, while the fallback is stateless.

In this book
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Published by Nine Rooms
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A permission a node can check with SHA256

About this book Available now

SHRINCS is a draft way to authorize a Bitcoin spend with SHA256 alone. The ordinary signature is stateful and small, while the fallback is stateless.

This book is an overview of the history of hash-based signatures, the people involved, the current state of the proposal, what a failure of secp256k1 would mean, the Simplicity verifier, and a roadmap for broader adoption.