https://github.com/dcdpr/did-btcr2

Decentralized Identifier (DID) Method btcr2 (did:btcr2) anchors identity to the Bitcoin blockchain.
https://github.com/dcdpr/did-btcr2

bitcoin decentralized-identity local-first self-sovereign-identity

Last synced: 5 months ago
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Decentralized Identifier (DID) Method btcr2 (did:btcr2) anchors identity to the Bitcoin blockchain.

• Host: GitHub
• URL: https://github.com/dcdpr/did-btcr2
• Owner: dcdpr
• License: mpl-2.0
• Created: 2024-08-28T19:15:24.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2026-01-05T19:29:59.000Z (6 months ago)
• Last Synced: 2026-01-14T21:39:40.202Z (5 months ago)
• Topics: bitcoin, decentralized-identity, local-first, self-sovereign-identity
• Language: Jupyter Notebook
• Homepage: https://dcdpr.github.io/did-btcr2/
• Size: 3.09 MB
• Stars: 11
• Watchers: 7
• Forks: 5
• Open Issues: 17
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# did:btcr2 DID Method Specification

**did:btcr2** is a censorship resistant DID Method using the Bitcoin blockchain

as a Verifiable Data Registry to announce changes to the DID document.

It improves on prior work by allowing: zero-cost off-chain DID creation;

aggregated updates for scalable on-chain update costs; long-term identifiers

that can support frequent updates; private communication of the DID document;

private DID resolution; and non-repudiation appropriate for serious contracts.

The full specification may be viewed at https://dcdpr.github.io/did-btcr2/.

## Compiling the Specification Locally

```zsh

> cargo install mdbook mdbook-mermaid mdbook-bib mdbook-tera mdbook-pagetoc

> cd mdbook

> mdbook serve --open

```

The specification will be compiled and available in the `book/` folder and will

be served via http://localhost:3000.

# History and Evolution of the did:btcr2 DID method

```mermaid

timeline

    title did:btcr2 — A Timeline of Development

    section RWOT Origins

      RWOT5 Boston  : Oct 2017

      RWOT7 Toronto — BTCR v0.1 Design Decensions : Sep 2018

    section Foundations

      Taproot & Schnorr activated : Nov 2021

      DID Core 1.0 Recommendation : Jul 2022

      BTCR v2 work (→ btcr2) starts : 2022

    section Specification Work

      Programming Bitcoin course : Mar 2023

      btcr2 spec drafting begins : Summer 2023

      DID WG recharter (DID Resolution focus) : April 2024

    section Exploration and Experimentation

      POC - Sparse Merkle Tree aggregation : Feb 2024

      Schnorr cryptosuite (bip340-2025) work starts : Dec 2024

    section Implementation and Adoption

      Implementations across Python/JS/Rust/Java : 2025

      bip340-2025 cryptosuite adopted (CCG Work Item) : Aug 2025

```

## Jupyter Notebooks

Included under the `old-spec/notebooks` folder are a set of Jupyter notebooks that implement the

various features of the **did:btcr2** specification. These are included as helpful reference

material for those intending to implement the specification. To run the notebooks locally see

the `old-spec/notebooks/README.md`.