Brian Albert Castro (born 1950) is an Australian novelist and essayist. Early life and education Castro was born at sea, between Macau and Hong Kong, in 1950. His father was of Spanish, Portuguese, a
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 0x8aeb2441d250b614130a84e49fa63e6694bf573f8cbffcf44a97f481657d041f. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45f535e0-b698-4d9c-ac25-fef535fa1723.json and https://artists.proofprofile.net/proofs/artist/45f535e0-b698-4d9c-ac25-fef535fa1723.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).