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 0x62ed8c109fd189c0d42332b06cc2c24a547f37803d2fed84e735df513cbeba77. 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/f94e4f8e-1377-444a-908a-14be8844997c.json and https://artists.proofprofile.net/proofs/artist/f94e4f8e-1377-444a-908a-14be8844997c.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 0x0bb96222d8255e3642d3488f6cc9d02b035bd93aa6ca5992fdd560fe35346c14. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZNJZ2512867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc7896700e825e264f0e16ced9fd7906e0408b180cc612fb859e4be1d0512f2a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNJZ2513143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68132c1bf97918b959c2c6d0247d4dfd20daf3aa8581de0571ef8994dff29d7. 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/QZNJZ2513151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de59384ee99bd49a7b92721df5dc2d6045787f0013ddc74558928d293d3c5d3. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/QZNJZ2513153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e3205898fabc734fd1efcebf5a85b3edaf44ca40e0155266eb0d3197789b3c9. 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/QZNJZ2513155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde36435e5f895eea14adbf7a3cfede3121ddfb2ce185f20ee62da8d8f12a9167. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNJZ2513157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ff9c716f89ff7dc1675fb04ccf76b9edd312233428b0e07d631b3f41916484e. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNJZ2512970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a18bd7b61aab00dff501086066cdb9ccc513a9f5ea13f3e5b07895855ac551c. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZNJZ2512868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e21e8faa04ac19361a3fe97b49459b38ecb27db0bdfe7d90b7c7d1fac339b43. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZNJZ2507912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bf7915832ec6dc9014facf75b85aa92b21131357d29c1d91026c57c1e6dbcd. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNJZ2507914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c3d814141a537fb0f5f18b32977dc2678aa39bd38bc426797197dbf3a6a1f9a. 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/QZNJZ2507915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0856189f9e306a15b8bac7c50daba08832a4fe031dad47a2945775f1c8a307f2. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNJZ2507916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd43119a730ae3808852a03f8f33e1e5105e23706a48778aae425c8dcbfe27d3f. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QZNJZ2507954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915c5e98c2119cb02dbcd764e31c774e14c8349793c3531609b5b9f4d5a9a345. Chain 2 (Bitcoin): anchored in block 958613 (2026-07-18T21:35:09Z), 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/QZNJZ2507953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96824d9d882677529ede7c29269690f878adb95b5202815dd2b623029580a1a2. Chain 2 (Bitcoin): anchored in block 957785 (2026-07-13T01:55:31Z), 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/QZNJZ2507926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87270e91d8fa9476e7a18e319debcb8a6605c1662387f2cdfcf3ff26b2037356. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZZ7R2553436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf589200aa0c7a17083a3e22de6bfcb6f2ec8d56a5bfe13be4e90680cad1786c. 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/QZZ7T2537826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb12ceb6c8b38cd10f770dd23d25b7ddedb92e14998a37519bd2ca449a291121c. 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/QZZ7T2537824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176277826711dc3e96e2a729e255e8e4ca5510595dfd33add4af506adeaabdcf. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/QZZ7S2555181.