Harry Douglas IV (born September 16, 1984) is an American former professional football player who was a wide receiver for 10 seasons in the National Football League (NFL). He played college football f
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe71143fc7816801e63684de1bb6f0efd0c1f47a79f427d44dd8a0906f0804089. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3a1c4e80-d494-4539-817d-edbcf72dae2b.json and https://artists.proofprofile.net/proofs/artist/3a1c4e80-d494-4539-817d-edbcf72dae2b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).