OpenTimestamps client

OpenTimestamps Calendar Server

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

Self-hosted tamper-evident evidence database for files, audit events, and data handoffs with portable offline verification

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

create, read, upgrade and verify opentimestamps proofs

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

Blockchain-backed timestamp proof for structured document sections

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.