Dark Tranquillity are a Swedish melodic death metal band from Gothenburg, formed in 1989. They are considered one of the pioneering acts of the Gothenburg metal scene, which also includes bands such 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 0xb914fcdc98dd2c05b24256bed4523397ab99d759a84f7c62d47d4c5638635ef9. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0395cbfd-e0a7-4310-b7e1-fda2ce2581f7.json and https://artists.proofprofile.net/proofs/artist/0395cbfd-e0a7-4310-b7e1-fda2ce2581f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).