OpenTimestamps

OpenTimestamps is a decentralized timestamping protocol built on the Bitcoin blockchain. It aggregates SHA-256 hashes of files into a Merkle tree and writes the tree root into a Bitcoin transaction, creating an immutable proof of existence. Its core service is free, open timestamping that allows anyone to verify data existed before a specific time.

The core competitiveness lies in decentralization and security: it does not rely on any centralized authority but leverages Bitcoin's high hash rate to make timestamps unforgeable and tamper-proof. Compared to traditional timestamping services, it solves the trust problem and costs very little, as many hashes can be combined into a single transaction.

Market pain points include: traditional timestamps are issued by third parties, creating single points of failure and trust risks. OpenTimestamps offers permissionless verification, suitable for legal evidence, intellectual property protection, and data integrity audits. In the past six months (March to September 2026), the protocol has remained stable, the community continues to use it, and extensions for other blockchains (like Cardano's C-OTS) have appeared, though Bitcoin remains the primary anchor chain. Overall, OpenTimestamps is steadily maturing without major negative events.