"Killer Queen" is a song by the British rock band Queen. It was written by lead singer Freddie Mercury and recorded for their third album Sheer Heart Attack in 1974. It reached number two in the UK si
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 0x0d0932c6cbfc970f66950d1f12ea66f4c94690065db9e27409662d89b48d91ce. 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/dc7e00db-b237-44aa-ba7f-2abaf02f1391.json and https://artists.proofprofile.net/proofs/artist/dc7e00db-b237-44aa-ba7f-2abaf02f1391.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).