Castle Rat is an American doom metal band formed in Brooklyn, New York, in 2019. Known for their "medieval fantasy doom metal" aesthetic, they blend traditional doom and heavy metal with theatrical li
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 0xca169336b9f04aca07f22f8759b1594af7096553c14536a216e3ac7b063c62fa. 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/5f141da0-3fc4-4e01-8954-4750fed42da9.json and https://artists.proofprofile.net/proofs/artist/5f141da0-3fc4-4e01-8954-4750fed42da9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.