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 0x17866de9ed4b61ae4b10584a914c91c9ae4a5ca00212eaf1b3b660ea49ecbbec. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4a38753-9d49-4aaa-b2a9-193ce164267b.json and https://artists.proofprofile.net/proofs/artist/e4a38753-9d49-4aaa-b2a9-193ce164267b.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 0xac500dc3750b822d9fb340918630571986b1234e6f7ac4e8c4567181c6c3638d. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T11:01:57Z), 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/USVI20600914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc9edcbf959fb0a56a358d4989d96e9e700842f64ee1ad12c386a52d6beb51f. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZK6K2217242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffc5c19f42f5d752acf49a5bf4cb7dbb9686291b878227a4a9728605607d744. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/QZK6F2272685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7479963f91b4fc8782dd9b9df8760137c787e551ed45ff2002ee7257b89704a7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6F2272686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11cd91766aaaa545925c8a356ef29a5ecff902c2163770a9c3e15691d8983de. 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/QZK6F2272688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9480cdfa33ab0082681ae5ff026dbd074d47c7edb3e6c51cf7d9667f3a759d73. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QMEU32502745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee86024119bef68feea9a297e84b155792b06384b2b63d72eadec87d8b36022. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QMEU32502738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13aae252118350603049c77183454de0170e22371326f18e71954cecb7377e0c. 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/QMEU32502739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaead116d70d5f5214f9122f02794676e5cdf829f7d148ccd7d5fa49303d36b69. 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/QMEU32502740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0688a26fd613b35183aa99e5f83fbf9aae6bd23beb0ee0f16f181a154545b08c. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QMEU32502741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617080ebfd9484976a60f4a3ba11f092d9daa6d243b9f77ab253265af7f5adf7. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QMEU32502742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9e23d592bfa93f66e8b8bfd46607f185f07e4db48ae4091b7b6d375adb2916. 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/QMEU32404013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83f894d54dc03baafc033424b584353e49e3aa5141c43b023677b9e76f6a5731. 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/QMEU32502743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149e30e85e4422d8c0316c2dd9641f266cf653e79d866e269907a1449f9b9cb0. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QMEU32502749.