CA1, CA-1, CA 1, or Ca.1 may refer to: Aircraft and other vehicles Buhl CA-1 Airster, an American sports airplane Caproni Ca.1 (1910), an experimental biplane of 1910 Caproni Ca.1 (1914), a Wor
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd61906a61f6c1aaf4db58aaf8b91148b9c498c70bbbf5fea580b0adea8c455. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f6ef83d3-27ee-4a53-b0ce-59bcfc9cc1b8.json and https://artists.proofprofile.net/proofs/artist/f6ef83d3-27ee-4a53-b0ce-59bcfc9cc1b8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).