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 0xe8662217fddedeeff8fec78b44e05020b8e7e850997b3453bdab18f439142ab7. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8719f91b-5dda-4282-9440-afe56c88efaf.json and https://artists.proofprofile.net/proofs/artist/8719f91b-5dda-4282-9440-afe56c88efaf.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 0x74b8f997fd81129ebad08509062b6afd6997e2722d8b877d9a3caed90f92c116. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLVZ21710001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b832a0e2ad4b78a037286b8911b5eda589b3a805085dcf7e85c4c7a6ff1df59. 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/NLVZ21700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb563b5bbbc410a52c5db203cd75f357a99f9998df7c8e77ea10f649606fa4f. 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/NLVZ21700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe34e17fb30aa399a5539602956cf508c62e3a990384f6b2d599fc9f1880e7dfd. 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/NLVZ21700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0658fa536c2bb0cf160488d34dce16b1097c8e06aa5fa1c343903b2c972ef549. 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/NLVZ21700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc4810f837e8ebb95124aae98c179984259db15dc5d324fb253884cf09b490f. 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/NLVZ21700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22c84c2015151645bb8d4c559dd0f85313e66988388d8ec321bb669f754a7d63. 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/NLVZ21710007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe013cf82121f9ee19827bf21975c852d5fe44de3beabf21b9c3ebb09b80e8bba. 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/NLVZ21700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eeb5b37a87ad8a57a962718d075db8bb3e2899f6fb01029126b97bed9e98322. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLVZ21700009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a3ea0c647c08bb86494e72e2ff921e0ead7ccc9a98ce64e7416660cbc433ae5. 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/NLVZ21700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1228980f096785fd175e2c5f0917c223e0043a8be249cadfc725dd730e4c19f2. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLVZ21700011.
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 0x4925bea05c7d4a5c0d46a0a5d22d298248e3dbbe131b3229b4ac73dfe38c61e8. 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/NLG7U1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf7745a77515c16bebe0537052b339e682fd5a2ce4cc657af81b8f77b3565d37. 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/NLG7U1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd9655b218860f5a5ad4fea1d452833e741f9252cc27ffd91b22e714a26fc60. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLG7U1500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3116e14e151fbea2b3c72c530c9e694544c9665906473d3dd694b16fdbf66d1. 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/NLG7U1500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb91d2fc3fd2252a0b86c11403544c56e4481ec44fc83c6d6cf00a9cd829fcc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/NLG7U1500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef229419b0081d1b57a284e04fbd74efa06a2e681ce5d9d1b7b4ea0f5ad5a94d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLG7U1500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7635b7e99b4d4f15b9cec072fbe7ef0e11bec32fe2a6820c05a638d4c5fea0f. 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/NLG7U1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x509526ed728c1243298de516da38cb360f5ea175f910bdc05c26b91a0e6d6e7c. 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/NLG7U1500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7244dafcba18f09814de1921a99ba794425d15df4369e6e84df7c96dae11d7bf. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:26:04Z), 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/NLG7U1500008.