Who we are?

A group of engineers based in Spain mainly who collaborate together for a common goal, making documentSign available for everyone.

Our goal is building ADAFirma, a decentralized signature service hosted on Cardano and backed by SmartContracts, will develop own custom wallet and link with others as soon as dApp integrations are more defined.


JackMail (Rebranding)

Were proudly relaunching JackMail a product we had to shutdown for competing with a brands name. Now, back and stronger.


We are creating a system that allows third parties to verify received documents, messages or data against the sender and the verifier. This service will work without any third parties, only those involved in the signature process, reducing the costs for the customer and increasing ownership and transparency.

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