ZKStamp Proof-100

ZKStamp Proof-100 gives AI agents and developers private, dated proofs that a file or text existed. Only the SHA-256 fingerprint is sent; the file never leaves the user's machine. The fingerprint is written into the encrypted memo of a shielded (zk-SNARK) transaction on the BitcoinZ blockchain, and the block dates it. Unlike public blockchain timestamps, nobody can see the fingerprint or who made it. Each proof goes to a new address and comes with its own viewing key, so the owner reveals one proof at a time, only when needed. Anyone can verify a proof with ZCheck, an open-source script, on their own BitcoinZ node. AI agents connect through MCP and can stamp in one sentence. New accounts get 3 free proofs. Code is open source (MIT).

Website: https://github.com/ZKStamp/Proof100

Shielded timestamps: the fingerprint is hidden inside a zk-SNARK shielded transaction.

Privacy by design: only the SHA-256 fingerprint is sent, never the file.

One new address and one viewing key per proof: reveal one proof without exposing the others.

Independent verification with ZCheck (open source), on any BitcoinZ node.

MCP server for AI agents: timestamp_fingerprint, timestamp_text, check_balance.

REST API for scripts and servers.

No card, no email, no account name: pay in BTCZ.

Free trial: 3 free proofs for new accounts.

Open source, MIT license.