opentimestamps

OpenTimestamps client

The open standard for proving any file is real, unaltered and sealed

OpenTimestamps Calendar Server

Rust library for OpenTimestamps

An OpenTimestamps client written in TypeScript

Go library for opentimestamps.org

Court-ready digital evidence for creators using RFC 3161 timestamps, blockchain anchoring, and forensic watermarking.

☑️ A prototype of a voting machine that timestamps its results using OpenTimestamps - 3rd place at the DC Blockchain Summit Codeathon 2017

GitHub Action to timestamp git tags on the Bitcoin blockchain

Forensic file hasher — BLAKE3 at 1,640 MB/s, 25 hash algorithms, Ed25519 + post-quantum signing, Bitcoin timestamps, YARA scanning, 50+ remote backends. hashdeep for the modern era.

An OpenTimestamps client written in TypeScript

EU AI Act compliance gateway for Claude Code and OpenAI/Anthropic-compatible LLMs: redacts PII locally and keeps a tamper-evident, hash-chained audit log.

mfv - Merkle Tree File Integrity Verifier. Proof that you securely published a web page, in combination with opentimestamps.org.

create, read, upgrade and verify opentimestamps proofs

Blockchain-backed timestamp proof for structured document sections

3,500+ Solana memecoin calls with entry cap, post-call peak and exact timestamps — losers included. Hash anchored in Bitcoin via OpenTimestamps. Live: smugcalls.com

OpenTimestamps core library — TypeScript, zero-dependency, fail-closed