Sources of base attestations

• Apple’s App Attest
• Camera Files
  • Content Credentials
• Credit Card Transactions via EMV
• Emails via DKIM signatures
• Ethereum Attestation Service, including:
  • Coinbase
  • Gitcoin Passport
  • Optimism Bedrock
  • and more…
• Git Commits
• Electronic ID:
  • Biometric Passports (ePassports)
  • Many government ID Cards:
    • A global list of countries with eID
    • EU Residence Cards for foreign nationals
    • eIDAS (future electronic id cards for EU citizens)
    • India (Aadhar)
    • Japan (My Number Card)
    • Taiwan
• Mobile App Data
• NFC Chips
• Onchain Data
• PDFs via Docusign
• Semaphore group membership
• ZK proofs attest to computation results