D73 may refer to: D 73 road (United Arab Emirates), a road in Dubai connecting Jumeirah and running south-eastward perpendicular to D 94 HMS Pursuer (D73), a 1942 Bogue-class aircraft carrier Neo-G
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 0xde3cf00a3b617875ff63a66a1fcb5a0406549f6a0f8c2ad97c5b646b48ab56f4. Chain 2 (Bitcoin): anchored in block 953991 (2026-06-16T18:47:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2eea21a1-031e-46d1-9098-2ce67988a4cb.json and https://artists.proofprofile.net/proofs/artist/2eea21a1-031e-46d1-9098-2ce67988a4cb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).