Blockchain-verified document integrity
Sign documents with cryptographic proof
Every signature is anchored to the blockchain. Every document has an unbreakable chain of custody. Prove authenticity to anyone, anytime, without trusting a third party.
Immutable Hash Chain
Every action from upload to final signature creates a cryptographic hash chain. Tampering with any step invalidates the entire record.
AI Field Detection
Upload a document and our AI identifies signature zones, date fields, and form areas automatically. Set up signing in seconds, not minutes.
Public Verification
Anyone can verify a signed document against the blockchain record. No account needed. Works even if Zdottedline is offline.