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 0x381d67620bdb63d30010d0405ed728b19692eaf5f39814f3883e9c296b6afa35. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c8bd7c32-4030-4846-8269-a576e5d32218.json and https://artists.proofprofile.net/proofs/artist/c8bd7c32-4030-4846-8269-a576e5d32218.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Marvel Super Heroes Have Arrived / Merry Marvel Marching Society
The Marvel Super Heroes Have Arrived - 2024 Stereo Remaster
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 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 0x22c4a93928fb06bb42633f2ea14eb79498172c8827db8e0156d3947d94326282. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/USHR12346548.
Merry Marvel Marching Society - 2024 Stereo Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52dcb52376456992142e5d2101b855254527a2a189ad768a29371a6cda6731d. Chain 2 (Bitcoin): anchored in block 956430 (2026-07-03T02:22:42Z), 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/USHR12346549.
Captain America (1966 Theme) [2024 Stereo Remaster]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92fbc85891c51246b1d3ad12306081ee5ad6471cf2dad34714ec2eeb12d0825f. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USHR12346631.
Iron Man (1966 Theme) [2024 Stereo Remaster]
Iron Man (1966 Theme) - 2024 Stereo Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6476c338001a6d41af4eb6401fca200d8f90039752f877e77775be2021ac31. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USHR12448254.
Hulk (1966 Theme) [2024 Stereo Remaster]
Hulk (1966 Theme) - 2024 Stereo Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c40dce92989fb347be0c7362cfd4fd569b0f5097c09dc1307de7664e7e2d246. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/USHR12448255.
Mighty Thor (1966 Theme) [2024 Remaster]
Mighty Thor (1966 Theme) - 2024 Remaster
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3276a3c694af9b159eccfc618fc25142f2b9b3798d9143c680485dfac301189b. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/USHR12448256.
Sub-Mariner (1966 Theme) [2024 Remaster]