David Joyce may refer to: David Joyce (businessman) (1825–1894), American lumber baron and industrialist in the 1800s David Joyce (politician) (born 1957), American politician and U.S. Representati
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 0x6238e983f839df65fa3847ca27b3fe4c1c9050c0c413d9a72bc608c2dbc2d0ae. Chain 2 (Bitcoin): anchored in block 953857 (2026-06-15T23:34:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/028f0b18-2479-4f3d-b510-49515048fe91.json and https://artists.proofprofile.net/proofs/artist/028f0b18-2479-4f3d-b510-49515048fe91.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).