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 0x2b36d9d52d09a48c6c247ce3e01fe50ff4c9a23e633774014166ed5c50a3f9a5. 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/88e2c7c4-6de8-4e88-be22-3da95acf719c.json and https://artists.proofprofile.net/proofs/artist/88e2c7c4-6de8-4e88-be22-3da95acf719c.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 0x6b9d566c644eb5a74b427bf8cc9edffac5d4385a03f1dc788fbf478e5dcbff55. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/QZTAY2598118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c137a4abfc87f1bf1b14b5e909a8938398d694572c4c405cd749f956cccd01. 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/QZTB22524843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5254c3d36ca3c733ea1eac6803b6129f90a2cea78d57474bc3f417c0419061. 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/QZTB72558581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fcc3298305a8dfc337c4a2b55215fbc99d492170c978c7b9bb1a907b25ea16a. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZTB72553765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0852bd2ddad6817adea3f96df7ae2760559d54992449244833fab3be544c7f4. 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/QZTB72553769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926c7c05e9abb95fc742c67c8aad95eeb40847fa45ae88f5261b86c5284f06da. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZTB72553852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa505a9df8fd8ffb6350a586cae9f294da4f4a3209c35e33c06e3f2fd1cf93922. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/QZTB72553973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x352496b93f1639620563768e13e2a414e5a5b34032570ba611825a3818a79d5a. 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/QZTB72553794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91712e44444dcb81e1ae8da5f028652c0130ddebc25fdee241f1965ddcb88e50. 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/QZTB72553837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdd561229526b0ae1c22ff639902c44b2e8f024cd095499705647342b1b1075. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB72551275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd974a4ec162461e9514f9b56aaa8495bcf3ae6af56ba5426a04885086a9f9039. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTB72558574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf778ed14716671742f4b7c0a371ef97c7b95edb50d30abc8d12b9e998948bfd. 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/QZTB72560658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3d55a57967ac5d1e9538020e9173c0bc924d0e4c557e4478d0f00cbf334795. 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/QZTB82512238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c1241bcf480779c40986eadf8524a035a2a6864d95589bb08c0a5ae37bedde. 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/QZTB82520384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a3ee74595d321ece852fdb976d4f927792b2fce37d3a1cd2b5f2b4b8e1a81c9. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZTB82520338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eac5fffa17ff94132013fb1c42dc801c136f15322c652fba071668495a33a6f. Chain 2 (Bitcoin): anchored in block 957810 (2026-07-13T05:55:46Z), 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/QZTB82520364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef5cdf6ce860a05e00a9513562cf42a984f9a64cc4e39fa3ca908ef521775505. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTB82520366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebcb69eb89466b36e0b0ad7189f323fb270ad177690220fbaef1fcce82f4e421. Chain 2 (Bitcoin): anchored in block 958104 (2026-07-15T05:34:05Z), 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/QZTB82520389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc68a37de52c943ee8092c85cceec1202cc0c1569ce6e2362bf1211b040181f4b. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZTB92500142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b9d67822703e6c88499654f05c488192c18ea60dabf3054b09b73bdd0c5851f. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFM2585116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a375401b9d3cc98e28c92b84192ca27dcbcfc33ded977cde9f72f3ef09b8e83. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZWFM2587958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52f8fce77900e777600d28867a9770924c8b0ac12b82f143654516e4a21b7cb. Chain 2 (Bitcoin): anchored in block 957791 (2026-07-13T02:46:19Z), 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/QZWFM2587980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda5cd1843d629dbf60de99773183bc611ba551dec3870b2f89706af928ad73e. 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/QZWFM2587978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bb8a8a4fd06346be70e9d9260c6b5f2001acf0896aed0b09f5f99b05965a214. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWFM2587991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91327c337a2a8994f0ee47e4235d52531f16dc61b8a3be299a436ddf3a532252. 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/QZWFM2587959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4cc55279f9a01da999f52f1360eb776f324aa907634b9882899b741920083af. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZWFM2587947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf26ba3902931388c3a56149295c8c9ce132feaf0b25c51f67bb8562ff3159e. 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/QT3F92585339.