A signature you can prove.
A signature is only as good as the evidence behind it. Every sign.pink document carries a tamper-evident, time-stamped audit trail — and when it's done, a court-ready completion certificate that shows exactly who signed, when, and that nothing was touched.
The record behind every signature
A scrawl on a page is easy to dispute — was it really them, did they mean it, is this the version they actually saw? An electronic signature done right answers all three, because it's wrapped in a continuous record of what happened. sign.pink logs every meaningful event from the moment a document is sent to the moment it's sealed.
That record is tamper-evident: it's captured by our servers as events occur, and the document itself is fingerprinted with a cryptographic hash before and after signing. If anything were altered later, the math wouldn't add up — and that's the point. The trail doesn't just describe the signature; it backs it.
Every step, time-stamped
Sent
We record the moment the document left your hands: the server timestamp, the recipient, and the document's hash at that instant.
Opened
When the signer opens the link, we log the time, their IP address, and device — evidence they actually received and viewed it.
Signed
Each signature is stamped with the exact server time, IP, and device, then the final document is hashed again to seal it.
What it proves
Enforceable e-signatures come down to three questions. The audit trail answers each one.
Attribution
Who signed. The trail ties each signature to an email-verified recipient, with the IP and device that completed it.
Intent
That they meant to. The sequence of opening, reviewing, and actively signing shows a deliberate act, not an accident.
Integrity
That nothing changed. Document hashes captured before and after signing prove the file you signed is the file on record.
What we capture
Server timestamps
Times come from our servers, not a signer's clock that could be wrong or fudged, so the sequence is trustworthy.
IP & device
Each event records the originating IP address and device, adding context that strengthens attribution.
Before/after hashes
A cryptographic fingerprint of the document is taken before and after signing. If a single byte changed, the hashes wouldn't match.
Completion certificate
When everyone has signed, we generate a court-ready certificate summarizing every event — exportable as a PDF you can attach to the contract.
Included on every plan
Free or Pro, the audit trail and completion certificate come standard. The evidence that makes a signature trustworthy is never a paid upgrade.
Both parties keep a copy
When signing finishes, everyone gets the sealed PDF and the completion certificate — so the proof lives with the people who need it.
Learn how this fits into our security model and why e-signatures hold up in court.
Audit trail FAQ
It's a chronological, tamper-evident log of everything that happened to a document: when it was sent, opened, and signed, by whom, from what IP and device, and with cryptographic hashes proving the file wasn't altered. It's the evidence that makes an e-signature defensible.
Sign with proof built in — for $3/month.
No credit card to start. No envelope limits. No surprises.