Black Submarine, previously known as The Black Ships until mid-2012, were an English rock supergroup formed in November 2008 by former Verve members Nick McCabe and Simon Jones, Coldplay/Goldfrapp col
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 0x6d4a7c31ccdddf809f445d8cbd23c9ada36f9ccf5bc486dcdd52b33f56a7c344. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/81477891-4f82-49e4-a952-f009e1aa906b.json and https://artists.proofprofile.net/proofs/artist/81477891-4f82-49e4-a952-f009e1aa906b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).