Sick City may refer to: "Sick City", a song by Elton John, the B-side of the single "Don't Let the Sun Go Down on Me" "Sick City", a song by PIG from the album Praise the Lard
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 0x19ce519ebfe708185078a3f87b139ff0c63deee47f49a2d2d5d13bf270ade253. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25626acd-62cc-4bc0-a190-0158eca06a29.json and https://artists.proofprofile.net/proofs/artist/25626acd-62cc-4bc0-a190-0158eca06a29.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).