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 0x8a622ed07492927d67dd88b02bdee67ac7582223c42b577f4fb54a4264c6543e. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e8859cea-3524-40f6-9d0c-8c9b48b0f4f9.json and https://artists.proofprofile.net/proofs/artist/e8859cea-3524-40f6-9d0c-8c9b48b0f4f9.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 0xe9b2a11bde27d92da7218348838c1c8cffad3f1d45917656e21145aa3ebdcf93. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/SE5Q51820887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9df3428bfc184fd1d5bb1cce173a8942a7f02872498550cf93e8f9342042acfb. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), 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/SE5Q51810283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba19e1978b8fe859ed3829e1bf748f54855c31a90c9b00f872191e00cbd15b0. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/SE5Q51812300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c07a4661bf542eea9f7cfffd2a4b42beaa900d754504e3b078cc2413c0d18e. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/SE5Q51804948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdf597243bedc0f40255b2bcae7b2c976bf1ad15c29899c6b1ec98e059caa55. Chain 2 (Bitcoin): anchored in block 957851 (2026-07-13T11:26:33Z), 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/SE5Q51828085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e59f9d1364bdf9814fa9d508305593b54d7c94c7888b9cc3fb8322ceada052. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/SE5Q51802147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08af63f5e50d82aab378864445e33f77737e1ef50d73726ddf8a906c3449c689. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/SE5Q51817618.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a74ca1b0964df06c307232dc93c8f813cad3a2755a4ff4ee47ba48ca00c90c2. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/SE5Q51802576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4439d8431e87951216cf5c57485cc18a35c0f088b7c29ff32a9c59e3d6d0027. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/SE5Q51806846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fe36cac1293eab2c23c12a0dfb510f4aa5d6820c43218a7a628191f9ab3fa44. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/SE5Q51800268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df57ee838aba87742f7180d082b7cc5da2071366c9511c471d9da4a0eb1fca1. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/SE5Q51800269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x266ec5d45ce1462a026c59b6de95d7f87cdd1ff04714379f0a313e5310832ea1. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/SE5Q51820764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb83f86d8dc046318cd95cd39d91770ea5d1f57ba48c1d2641dff246d0a496ae. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/SE5Q51805252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb66ba93056bdfb933eafdfbda34cf5825f84ea0de1a95858d96c9c6ef23c08ae. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/SE5Q51800738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765d7f0d501acd9fb494f41994d8bcbefc8ba83880073223450e5539b36420ad. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/SE5Q51800739.