Marmaduke Duke are a Scottish conceptual rock duo from Ayrshire, Scotland, comprising Simon Neil of Biffy Clyro and JP Reid of Sucioperro. Within the band, the pair perform under the pseudonyms The At
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 0x59ee60c1d63307a1e73f335d50adfe25c3cf05bf11db3c989217c33ff4f0340c. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3dfa127a-b1e8-48d5-b2f8-b40d22bfbb0c.json and https://artists.proofprofile.net/proofs/artist/3dfa127a-b1e8-48d5-b2f8-b40d22bfbb0c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ccc5e1be1ffc0356ba3d16d22462393c0f48cdcb5353ca21dcf15a1257e214. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBFTG0900022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f9349099de0d1e767dd42b06fe0f16d370271e5c04b7aab09faca68188f55d. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T11:01:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBFTG0900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e230b3e1ba91e5c6ce362b0edb47a3030acd5ec46b42ae79973c75db475b2bd. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T07:10:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBFTG0900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ccc5e1be1ffc0356ba3d16d22462393c0f48cdcb5353ca21dcf15a1257e214. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBFTG0900022.