Overview

CapSign provides blockchain-based document management with cryptographic signatures.

What are CapSign Documents?

Documents on CapSign are:

  • Uploaded to decentralized storage (IPFS/Arweave)

  • Signed with biometric authentication (Face ID/Touch ID)

  • Recorded on-chain as attestations (via Ethereum Attestation Service)

  • Verifiable by anyone with the document hash

Key Features

Cryptographic Signatures

  • Tamper-proof - Can't be altered after signing

  • Verifiable - Anyone can verify authenticity

  • Legally binding - Recognized in many jurisdictions

  • Timestamped - Exact signing time recorded

Biometric Authentication

Every signature requires Face ID or Touch ID - no one can sign on your behalf.

Decentralized Storage

Documents stored on:

  • IPFS - Distributed file storage

  • Arweave - Permanent storage

  • Your choice - Or use your own storage

EAS Integration

Document signatures are EAS attestations:

  • Privacy-preserving - Document content not on-chain

  • Portable - Use attestations across platforms

  • Revocable - Can be revoked if needed

Document Types

Common document categories:

  • Subscription Agreements - Investment contracts

  • Operating Agreements - Company governance

  • Employment Contracts - Hiring documents

  • NDAs - Non-disclosure agreements

  • Consents - Shareholder consents

  • Amendments - Document amendments

  • Custom - Any document type

For Users

Signing Documents

  1. Navigate to Documents

  2. Click on document to review

  3. Read entire document

  4. Click Sign

  5. Authenticate with Face ID/Touch ID

  6. Signature recorded on-chain

Learn more: Signing Documents

Viewing Signed Documents

See all your signed documents:

  • Navigate to Documents → Signed

  • View document content

  • See signature details

  • Export signatures for records

Verifying Signatures

To verify a document signature:

  1. Navigate to Documents → Verify

  2. Upload document or enter hash

  3. See all signatures and signers

  4. Verify authenticity

Learn more: Document Verification

For Issuers

Uploading Documents

  1. Navigate to Documents → Upload

  2. Select file or enter IPFS/Arweave URL

  3. Choose category

  4. Add required signers (optional)

  5. Upload

Learn more: Uploading Documents

Requesting Signatures

After uploading:

  • Add required signers

  • Send notification

  • Track signing status

  • Download signed copies

Document Management

  • Organize by category

  • Search documents

  • Export document lists

  • Archive old documents

Technical Details

How It Works

  1. Upload - Document uploaded to IPFS/Arweave

  2. Hash - Content hash (SHA-256) calculated

  3. Attestation - EAS attestation created with:

    • Content hash

    • Storage URI

    • Signer address

    • Timestamp

    • Category

  4. Signature - User signs with smart wallet

  5. On-chain - Attestation recorded

What Goes On-Chain

Only the attestation goes on-chain:

  • Content hash (not document itself)

  • Signer address

  • Timestamp

  • Metadata (category, title)

Document content stays off-chain for privacy.

Storage Options

  • IPFS - Distributed, content-addressed

  • Arweave - Permanent storage

  • Custom URL - Host yourself

Best Practices

Before Signing

  • Read everything - Don't sign without reading

  • Verify sender - Confirm document is from legitimate source

  • Save copy - Download document for your records

  • Understand terms - Ask questions if unclear

Document Organization

  • Use categories - Organize documents logically

  • Descriptive titles - Make documents easy to find

  • Regular backups - Export document lists periodically

  • Secure storage - Keep local copies securely

Security

  • Verify authenticity - Check document hasn't been tampered with

  • Check signers - Ensure all required parties signed

  • Revoke if needed - Revoke attestation if document is invalid

  • Report suspicious - Contact support if something seems wrong

Legal Considerations

Electronic Signatures

CapSign signatures are electronic signatures under:

  • ESIGN Act (US)

  • UETA (US states)

  • eIDAS (EU)

Legally binding in most jurisdictions, but consult local laws.

Evidence Requirements

For legal proceedings, you may need:

  • Document content

  • Signature attestation

  • Blockchain transaction

  • Timestamp proof

CapSign provides all of this automatically.

FAQs

Q: Are CapSign signatures legally binding? A: Yes, in most jurisdictions under electronic signature laws. Consult local attorney.

Q: Can I sign the same document multiple times? A: Yes, each signing creates a new attestation.

Q: What if I signed by mistake? A: Contact the document owner to discuss. Signatures can't be deleted but attestations can be revoked.

Q: Can others see my signed documents? A: Only if you share them. Documents are private by default.

Q: What happens if IPFS/Arweave goes down? A: Keep local copies. The on-chain attestation proves you signed even if storage is unavailable.

Guides

Need Help?

PreviousCompliance OptionsNextUploading Documents

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