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 0x26ecc962517adb8105a1e00dcf40c2565300ef1ee6024d71291ca50eeee0453e. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e91f8688-fb75-425c-96eb-bbda1207f0bd.json and https://artists.proofprofile.net/proofs/artist/e91f8688-fb75-425c-96eb-bbda1207f0bd.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 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 0xba2d2277056b1c7b4e73b2d56c9d7fe96c09125d38bd9796bf21f94db57cc2c6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DK6M41901005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33b5b2571549e5b71e4628a07caac187e1bc8b23c6497d37a2006984f05fcac0. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DK6M41901011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd8a4d734704b5e08e5dd4c185eda4c086b1661ddd57e8294b6170236a06df8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK6M41901008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9b6533bd4672a6b4fc63af964adf5885ce9fa02fa75f19704f1ffc2d3b1788. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DK6M41901007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5adb4caa1cf7768702161d8d7c84f8ed11795424ccb86614b1f41374be62a19. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK6M41901012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb34195edffffbcc1d4d746db39d2eb9b81c9926a95da951f462552efdcc7f1c5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK6M42200201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b35e6995a8fbcf5fa095c3ed3dc4b44b94d943ec11210c8cb2447702de2b8f0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK6M42200204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ff6d2a9aa51e931f9154da27d9e180e9d8110c1e45917d2eb5eb1ea4966a946. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK6M42400301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x806a7ce494148c51019bf0a047558486fb7a5e639537913cb2322d2274a6a8fe. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-17T00:23:53Z), 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/DK6M42400201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d5457e08d4cd46ad37c5f8e92b75b0618eda2bd4291f610075e595203a4af5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK6M42100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf03bf06042bcfb67c49f9a985c99ded6d47ba32c50c71ea95a3c55494506ddb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DK6M42001001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e95b632c1581cfe6759dcde14f8e5a366665c99e146d67d453163dc6992f69f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DK6M41500201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a2dd78251cd63817904b6c1b946d8469c777d80a48fa69380f04542e6b09b1c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DKFD52683001.