Digital contracts — cryptographic signing and arbitration
Sign contracts with PGP, verify integrity via SHA256 and resolve disputes with built-in arbitration. Court-admissible proof.
Create contract
Sign contracts with PGP, verify integrity via SHA256 and resolve disputes with built-in arbitration. Court-admissible proof.
Create contractPaper contracts easy to forge and impossible to verify remotely
Expensive centralized digital signing platforms
No accessible dispute resolution mechanism for person-to-person contracts
Both parties sign with PGP keys — cryptographic non-repudiation, impossible to deny
The text is fingerprinted with SHA256 in your browser and both signatures cover that fingerprint — the signed text can never be swapped
Timestamp anchored to Bitcoin blockchain via OpenTimestamps — immutable proof of when it was signed
3 tiers: P2P (UNCITRAL), institutional (CAC Lisbon) or court — fair dispute resolution
Text written in the editor is encrypted in your browser for the two parties and a named arbiter: the platform stores only ciphertext it cannot read. Your own file never leaves your device — only its hash is stored. All signing is client-side
Open-source, no per-signature fees, no ads. Civic infrastructure, not a product
Upload the file and sign with your PGP key
Your partner verifies the SHA256 hash, downloads and signs with their key
Both confirm completion — in case of dispute, escalate to arbitration
Signing contracts should not cost money. Parahub offers free cryptographic proof admissible in court.
Create contract