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 0x7e98b0c04727079857311c52841fbc405755a830bd204956c378c706187dcf5c. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1c340b6-efc5-48f7-91e8-8feefe8ab6d1.json and https://artists.proofprofile.net/proofs/artist/b1c340b6-efc5-48f7-91e8-8feefe8ab6d1.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 0xfa3573695f07dceae45909e565997f6f4fe4e272d96c12b9e3fa5955a3cc117b. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QMDA72213539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcda581a266412a226de7ac23e59f2859751b6a224885bfb7c433a366d6f3ffb. 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/TCAGI2277336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c866fd4448dfeaed993a7d3b65a7dea8cd71bda3578b0526ed7f8f8c21d408. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/SE3GO2118101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa43122045afddeaad17ee48ac57acf346ba8fd1f808fba973514663ce6915d1. 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/QMFME2103175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72df02cda4e7478dbce1d3a38540231b228d9bdaf334630a3761d35b1a9b62fc. 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/SE3GO2103101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc993993d85bee821f0f3438e60dd89f4bc876f26941f782958d7a993fea8db27. 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/CA5KR1977530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f6142c44fb28c942673ef6799a696bee4ba4fa90f5546b50f90f58da90b2fc1. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBSMU9144876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0a4229754be2a7c3dba35c3ef277dd35b7d1a027c378e2e9967918dbc9fde0a. 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/GBSMU9144885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f6b4968d0bfc7cf4ef8fd2f8c61da38d6577f19949cad9942d51ae395c49332. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBSMU9144894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1f486b16fd1230b79004b2b75e884cdbaf36dcd1cecb2c51baefe6977f3adf3. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBSMU9144904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64fea6bf624e93cc5709ed94e122bdd50b05f59c3d0631bd780256c4149c4d4. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/BEZ642300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48dcec655c9a43b9b8ed2df83b271000495d7f51556da02cb8db1b0edf9818f0. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/BEZ642300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe78e55879d91d6bf736880cbe87d8ad15bf20aa312be7947844df3ce00ef347c. 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/BEZ642300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c93a72543ba4c55e15fbb06d960ffaa0c2c339040013263276aa60cfccf9f0. 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/BEZ642300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x664457b9e7acc204980518b06e3a8cd5dc54e7ba16b71918b3d340e7ecfa1ce6. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/BEZ642300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc136b70454bfca2306bcb3e7ebfbd8e3084a975659459b53c3d11a3c540abc56. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BEZ642300026.