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 0x76458f60eec90cd804db0c20f1e8133e55a1986f75c19ca752665177dca50e83. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d28da79b-d68c-41e8-99bf-be8e479f0c9b.json and https://artists.proofprofile.net/proofs/artist/d28da79b-d68c-41e8-99bf-be8e479f0c9b.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 0x61ff28fe112a0367c33d70b7ea4709dfc56caedfceaa75be61a2a3ed827fdb9c. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DKFD53607007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b3f2f7d5b21e16d9d60061985984b7d4779b7256582cdce55b069b256ae3170. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/DKFD53607012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c7aa86a56564d0b8f337034123f506d0145be38fbff324af51893387dcfeef. 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/DKSF11800501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf9366935482e1e73f6d9128dcc69a74e26593924d029487619e4c565735809. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/DKSF11800502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e31a85d8a88e26f2532f2c05d5effb1f2a13544a1b935ad53db2131265d384. 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/DKSF11800503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd96e139a43652ab3fd3c7267d09535d08d4c4d146c043a244a0c015b6e3ac7b6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKSF11800507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e875b49765ad915576c0f2929505e433191c35fde7d50e296224efcd24c031a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKSF11800510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb94708d2710fc4b6ec6b6bfa8cd2a4526d04cf70d2f08f640ebeacdfe82e125e. 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/DKSF11800511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cb6f3fb2c4863fa20efa80f7edd59c30cfb7146d8fc0acd23bfbf34497a02c2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DKSF11200402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca7b9e055a1701a5837ee8834b2d3848eae78e4f1712cf9d28fa9311df7e787. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/DKSF11200406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9b7786f893e3c696e1e6e9050df93ca6b2a74d10bbf3453b97ff02b679f381. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DKSF11200408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9900dabc4560d1c5e3234393bc3a26b6c202758d1389d093af8facdd021796d2. 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/DKSF11200411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f8e6bedfe22b692459a0f799c1ebdaae1dec0c9e73a08a405a6917f5fb7060. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DKDH72000401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd621c48ff276576dfa1f9c0547ef1af8a5489a57d01d4e89240ddf303237ae3. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/DKDH72000404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1d51020c4b0d7a2bd70d3583f10d2056ea04003e3245b0cbd3f2f8cc9b2a9a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DKSF11801201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x368768c6020f5df5296db58eb6424905331127305a3823713300711589e63bbc. 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/DKSF11801203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66a869d90702573c079c2a19a3bae940b22a3ef1bc0231d784967d3d50eef9f. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/DKSF11801204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2779f1e8a1f45486773fbf131fa17bfeb56d0bdecc0ea4a7a5df3902c63abebf. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DKSF11700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b07dfc0ec71b782e5b24fcdc43fb79302b62d5da816e49893ea65c28119a15. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/DKSF11700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd61f20dd39ddb7710a6b26e241dafac0d294609e3a1cc5017fc003cadf194b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QMFME2271657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ad5bd745b4dac29b2dfede7db0f7810ae2327c4eea437bb1fb8f993aefa7a0. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/QMFME2271709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d681bd478ce7142f07c4b0b8fcd8a94bccfc46c1ebaa2d0c4c5654d1c035049. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QMFME2271723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0fe5643158f9ac170d82a500d87284e4dfa811c4970692b926df0e58b177f2. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QMFME2271763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf721744cfaf6097c3ddc721dff2621677230af4d0e6e39b52c8c0ed42f20d3c. 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/QMFME2271902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x944ac1592fef09b931fba3d3ce47be564b92be9ecb76ec38883d94ae437a9c43. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/QMFME2284937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42e28f373223a1c7b67e9e1190b88c9c731fc821257c2796da3779640b1eaff. 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/QMFME2285149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2790f4643b7d79e2c35f88fa1226f4950606fe384eb506f23ea22bff5e5adea3. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/QMFME2285219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db602b211272a435cc337ec1649e4d124c17c6950dae6823e2221077697f72b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QMFME2285315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0244db0a53287fbaa0385a8a6552227ec594bfa1c5c809328cd92a1f4d86d3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMFME2285476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674a6e9c50686e4b4f7e58c2a4bc74de4d97ceea875704d8314d3d9d704de8e0. 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/QMFME2285631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ccc6b91782a3b75d699ef59b2da20e6ae98d6e5e1488b59739aa451567c7fab. 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/US83Z1775900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c3143c579b882215c69956fccd29e3a8f6b6ce571aefa2927affb80bb2f649f. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/US83Z1775882.