Decentralized Document Authentication with Prime-Space Fingerprinting
Prove any document existed, when it was created, and who authored it — without revealing its contents to anyone.
Multi-chain timestamping across Bitcoin, Ethereum, Polygon, and 10+ more networks for redundant, immutable proof.
Generate partial proofs without full disclosure. Prove structure, authorship, or existence of specific sections.
Everything runs on your machine. No third-party server required. Your documents never leave your device.
Lock encrypted content in an on-chain vault with a heartbeat-based dead man's switch. Content auto-releases if you stop checking in.
MIT licensed, free forever. Optional support fee helps sustain development and infrastructure.
macOS, Windows, Linux, iOS, Android, CLI, and API. Use PrimeStamp wherever you work.
A PrimeStamp Vault is an on-chain dead man's switch for encrypted documents. You deposit encrypted content with a heartbeat interval — as long as you keep sending heartbeats, the vault stays sealed.
If you stop checking in and the heartbeat deadline passes (plus a configurable grace period), anyone can trigger automatic release of the decryption key. The encrypted content becomes publicly readable.
Use cases include estate planning, whistleblower protection, insurance deadlines, and warrant canaries.
Hash your document and sign it with your cryptographic identity.
Submit the hash to Bitcoin, Ethereum, and other blockchains.
Optionally lock encrypted content in a dead man's switch vault.
Anyone can check the blockchain proof, anytime, for free.
iPhone & iPad
SwiftUI + Flutter
App Store — coming soonMaterial You
Flutter cross-platform
Google Play — coming soonPrimeStamp is free and open source. If you find it useful, consider supporting the developer.