Black Ingvars is a Swedish humorist heavy metal group. Black Ingvars is famous for cover versions of songs from other musical styles, like pop, children's song (including "Sjörövar Fabbe" and "Här kom
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 0x2bc64d6854227e07f6f7abd8501ff552cd2cf22b4eec4fd52ff4bc07800d426f. Chain 2 (Bitcoin): anchored in block 953610 (2026-06-14T07:58:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/14a67fd7-a61a-4193-85d8-455dfddb2355.json and https://artists.proofprofile.net/proofs/artist/14a67fd7-a61a-4193-85d8-455dfddb2355.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).