About ProofSeal
Permanent, verifiable proof for your data — anchored on Bitcoin
ProofSeal is built on a simple idea: important digital records deserve a permanent, independent timestamp. We use the Bitcoin blockchain as a neutral, decentralized foundation so your proof can be verified by anyone — now or in the future.
We focus on clarity and control: plain-language certificates, independent verification, and a workflow that respects privacy by default.
We don’t gatekeep use‑cases. We provide the tools; you decide how to use them.
Our proof format is open, documented, and designed for independent verification. You never need to trust ProofSeal to verify a ProofSeal certificate.
Legal & Compliance
- • Document & evidence timestamping
- • Contract verification
- • Regulatory compliance
- • Intellectual property protection
Academic & Research
- • Research publication
- • Patent applications
- • Academic credentials
- • Data integrity
Business & Enterprise
- • Audit trails
- • Supply chain verification
- • Financial records & releases
- • Corporate governance
Personal & Privacy
- • Personal records & ideas
- • Identity verification
- • Private communications
- • Digital legacy
Our service leverages the Bitcoin blockchain's inherent properties:
- Immutability: Once recorded, data cannot be altered or deleted
- Decentralization: No single point of failure or control
- Transparency: All transactions are publicly verifiable
- Security: Protected by the world's most secure network
We commit only the 32‑byte SHA‑256 hash (hex) to an OP_RETURN output — no headers or identifiers — keeping the on‑chain commitment compact and future‑proof. Our TXT certificate includes clear, human‑readable instructions to verify with public tools or your own node.
Privacy is the default. In private mode, your data never leaves the browser — only its cryptographic fingerprint (hash) is transmitted and anchored. When you choose public mode, your file or text is shown alongside the verification data on your dedicated ProofSeal proof page.
The owner token sent to your email lets you manage visibility after creation. You control what’s public, and you can always verify independently — with or without ProofSeal.
OP_RETURN Payload
The OP_RETURN contains only the 32-byte hash (no header/magic).
Private Mode
In private mode, your text or file never leaves the browser or your device. Only the cryptographic hash is transmitted and stored. This ensures maximum privacy while maintaining verifiability.
Raw Hash Option
If you already have a SHA-256 hash of your content, you can use the Raw Hash option to skip the file/text step entirely and anchor the hash directly.
Independent Verification
All proofs can be verified independently using your own Bitcoin node or public explorers — no trust in ProofSeal required.