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 0x456354b3ab33c43b24d4c1029b6233c7991dd33f01f7b0dac92be9b262a50dd2. 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/d9eb796b-460a-401e-90cf-a92ff47b1032.json and https://artists.proofprofile.net/proofs/artist/d9eb796b-460a-401e-90cf-a92ff47b1032.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 0x90e0e0fac7eb7eaa51cac9444939449db062d59d392d9811228651b923a988fa. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ESA081701199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18768d6846b4158507d130107a429dc62605a25391d0e8bdc53449d1c1f9db98. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/ESA081701206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8890016d3a3f30ead4baa83210e4582b5acd496b84460b3db4ef17d5b1ad614. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ESA081950751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1d5b9b4bd478b4c062253d605a680acc70f4a4d8123aae7b7204ad077f5f86. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/ESA082100026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3175e2dd9f7a3552ce7111ba416e8c3d961246e32d9f265dbe3eacde69a89fed. 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/ESA082324147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889e90cc0133b73eca0c195886717d5fb664a2057b666056b269a208b8882084. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/ESA082313340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3175e2dd9f7a3552ce7111ba416e8c3d961246e32d9f265dbe3eacde69a89fed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ESA082324147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9508d7531a55d2baaeab580a046fc000cc91907b4bbb4e2bb6cde327aa0dff95. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/ESA082500442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa0e277ab1536dc7f98c55b0538672625a908c60410c1c1584f082938779f32. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/ES90S2201929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b77a5b905e3b4b51f35c13305e76ccddf4d72a92f558072288ee498e3ea169. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QM4TW1929476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84fea5e85125e9c0b6b3e1756b8b00913c5c5d5498bbbac7d94bb43ccdaad68. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ESA082313796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79357161cc87ee02c005773d876d4e5dbd55f7c6f56c9fdd0097937a2380ed71. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ES71G2422556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc581643c1cb9a94be5d7d42816d6224104e3c4adcee8f06ed0f1d460568caf8. 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/ES7311600116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5083b35151e7de51b2aafe390cc3e9d5d73ca6a8a055f63200b72b2cf7a70c5. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/ES5592300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815d7742cee0ac309a75a7d3efaf0f17081b64583cb102bd893f9b2e55b1f555. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/ES5592200502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d7217216d18aab893d85385b38cae57a9117d4b47aecb2bac9d03c195481d06. 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/QM4TX2329836.