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 0x0f35b2a871843cd6499f3a5e37db1a0de35b0d0ed40a82ac83f2cd644feabc69. 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/373d42aa-f991-4ec1-9698-585844110af4.json and https://artists.proofprofile.net/proofs/artist/373d42aa-f991-4ec1-9698-585844110af4.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 0xe822d1b5c5a3c6bf5c980bb3d9de94ec77cada15482dd21b06297150acbe448c. 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/BRAG20300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70379cf5e08cd25cca9d764dcc0a4eff013abb0eeef634f73279ee60a1c50241. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/BRAG20300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f2bd94adf0bf511ed7256cbd0cd9fc61fef02a9e132eaa31f04b903cc82cd15. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/BRAG20300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbc818677caf95c0f88a6ba0030ffc065de16483e7f83e2357042e29dce0c740. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BRBE00400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ced64d0adda9a5a5c338f1f2b0d2754a7dfd8af6b572a75497deedb21cc3aff. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/BRBE00400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82ebe83f60074c6ad908f21d885ec98aedf238213baa569c9cbc17be500722f8. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/BRBE00400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ce0285707beb89e8382f2432271366602cba0b9c7c67f456262f487685e49f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/BRBE00500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d4cdc304bf9c3187809001b67de42ce147094b21fa269a0a338b5b21d00df4b. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/BRBE00500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88a7cc276c26b523763ac48e0023a19e72cf5a0f91adba2fc851a545ab5a031. 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/BRBE00500018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9773a6486997f886bc4096839a9d3c496dac1d4f15716c5e8aa0003f8fb9f20. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/BRBE00500020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2f592357853876bf6515ae577edb2c9dba162f36fc5b877c9eb45a8f2acd435. 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/BRBE00500022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe864e9ea6faa4f42c7ace7eb5ac7cc8b001a2e1f97c89302c987ecb146da44ae. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/BRROF0300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8d2b20b8da2562f5ab805283da9fa765749a43d212633e6c92884b99e7f189b. 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/BRBE00500001.
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