Gridcoin is a blockchain-based brand that offers a service called Gridcoin Blockchain Stamping. This service implements the concept of Proof of Existence on the Gridcoin blockchain, allowing users to securely and anonymously store proof of the existence of their documents without revealing the actual content. With the use of blockchain technology, Gridcoin ensures that proof is stored on a transparent, unalterable, and permanent public ledger.

This provides a convenient solution for establishing proof with a timestamp and signature linked to the entity. The service has various common use cases, including proof of ownership, data timestamping, and data integrity checking. The Gridcoin service calculates the document's SHA-256 hash client-side, ensuring the security of user data.

No data is stored on their database or the blockchain, and privacy is prioritized without the use of tracking pixels. Stamp transactions on the Gridcoin blockchain involve embedding the SHA-256 hash of the data in a transaction using the OP_RETURN script opcode. This allows for efficient storage of multiple records in a single transaction, saving on fees.

Currently, the service is offered for free, and the low cost and level of donations suggest that it will remain free for the foreseeable future. Stamp your documents securely and transparently with Gridcoin Blockchain Stamping