OnChainImprint is currently in a testing period (beta). Inscriptions are recorded on test networks during this time.
₿OnChainImprint

DocuSeal

Seal any document on Bitcoin forever. Cryptographically prove it existed, authenticated by OnChainImprint's patent-pending technology.

Patent pending

How it works

  1. Upload your document. Your file never leaves your device. We compute a SHA-256 fingerprint locally in your browser.
  2. Your document's fingerprint is permanently sealed on the Bitcoin blockchain with OnChainImprint's patent-pending authentication.
  3. Receive a certificate with your document's fingerprint, transaction ID, and blockchain timestamp, independently verifiable forever.
Privacy: Your document is never uploaded to OnChainImprint. Only its mathematical fingerprint is recorded on-chain. The original stays yours.

PDF, DOC, DOCX, TXT, PNG, JPG up to 50MB. Hashing happens in your browser only.

Blockchain: Bitcoin

Price: $39.99 USD

Payment method

No refunds. All sales are final. Once your fingerprint is inscribed on Bitcoin it cannot be altered, deleted, or refunded. Confirm your file is correct before you pay.

Already sealed? Verify a document fingerprint →