thumb|280px|alt=Drawing of the various parts of a bird's wing|Location of the alula on a bird's wing The alula , or bastard wing, (plural alulae) is a small projection on the anterior edge of the wing
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 0xe6cc8623c7c878eb1610d394f536fcf5daab0e31c6b178c1d61c0cd2853074ae. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a74996dd-2dbe-45d1-b543-c58ec623c390.json and https://artists.proofprofile.net/proofs/artist/a74996dd-2dbe-45d1-b543-c58ec623c390.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).