1Bridge Vault

Use Case

Contract signing and attestation

Beneficial Owners & Controllers execute NDAs and vendor agreements with Regulated Firms inside the same encrypted vault. Get tamper-evident proof anchored to Bitcoin. The proof does not depend on trusting 1Bridge.

Who:Beneficial Owners & Controllers signing with Regulated Firms (law firms, corporate service providers, vendor counterparties).

Documents: PDF contracts, NDAs, vendor agreements, corporate authorisation forms.

Replaces: DocuSign audit logs alone, email PDF exchanges, unsigned forwarded copies.

Control: Client-side encryption, SHA-256 hash chains, watermarked executed copies, Bitcoin OpenTimestamps attestation on owner-finalized contracts.

For Beneficial Owners & Controllers →For Regulated Firms →

How It Works

From Request to Attested Contract

Signing runs on the same confidentiality model as document sharing.

01

Create Signing Request

Upload a PDF contract, place signature fields (signature, name, title, date), and send a signing request to the counterparty.

02

Vendor Signs

The counterparty verifies email via OTP, reviews the document, and signs with recorded electronic consent. A SHA-256 hash of the signed PDF is stored. Any tampering breaks the chain.

03

Owner Counter-Signs

In dual-signing mode, you counter-sign to finalize. The fully executed PDF is watermarked with a QR code linking to public verification.

04

Bitcoin Attestation

The SHA-256 hash of the final watermarked PDF is anchored to Bitcoin via OpenTimestamps. Download a verification certificate. Anyone can check at /verify?sig= without trusting us.

Signing Modes

Three Ways to Execute

Dual signing

Counterparty signs first. Owner counter-signs to finalize. Triggers watermark, QR verification link, and Bitcoin OpenTimestamps attestation.

Vendor only

Counterparty signs and the contract is complete. Encrypted, watermarked, and audit-logged, but without owner counter-signature or blockchain attestation.

Owner only

Owner counter-signs from a prepared template. Useful when you need to execute a document on your own signature fields.

Attestation

Proof That Outlives the Platform

When you counter-sign, 1Bridge does not ask you to trust our audit log alone.

  • 01Each signing stage stores a SHA-256 hash. The next stage must match the prior hash or the request is rejected.
  • 02The final PDF is watermarked with 1Bridge · Blockchain-attested · Verify: … plus a QR code.
  • 03OpenTimestamps anchors the document hash to a Bitcoin block. Confirmation email includes a link to download the verification certificate.
  • 04Upload the PDF to /verify to confirm the hash matches the attestation, independently of 1Bridge.

Attestation applies when a document is fully executed.

Built on 1Bridge Vault

Access 1Bridge Vault's security and privacy features

Client-side encryption: signed PDFs stored as ciphertext
Three-factor access: link, OTP, vendor secret
Watermark on every executed copy
Append-only audit log for all signing events
Team delegation for signing workflows
Instant revocation of pending requests

Positioning

Confidential E-signing

vs DocuSign / Dropbox Sign: They store readable document copies on their servers and provide platform-controlled audit trails. 1Bridge stores ciphertext only and adds Bitcoin-anchored proof anyone can verify independently.

vs email PDF + scan: No consent record, no hash chain, no watermark, no revocation, no way to prove what was signed when.

Sign contracts with proof you can verify yourself

Join the waitlist, or try browser-based signing on the free tools page. No signup required.

Try free signing tools