We make signatures you can check.

A signature has always meant three things: it is yours, it cannot be copied without you, and it fixes a document in time. The cylinder seals of Mesopotamia did all three, five thousand years ago, with stone and clay.

Most e-signature tools do the first two and leave the third in a PDF nobody checks. TerraSign makes it visible. Every finished document gets a seal cut from its own SHA-256 fingerprint, an append-only register of every step, and a public way to verify any copy.

We keep the product narrow on purpose: send, sign, fire, verify. Email only, no tracking, and a person reviews every sender before they can send.

Questions? Write to help@terrasign.net or see the contact page.