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 0x8af69bd034bc477296c18a20e079f6e255328a1e5dd7992b6a5bab77ce628458. 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/3050e13f-ddd9-403e-b7a7-1eb1658071ae.json and https://artists.proofprofile.net/proofs/artist/3050e13f-ddd9-403e-b7a7-1eb1658071ae.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 0x60e6b141e8ff5f6416e2ca92de8bcff7624615c2eabab9889671aaa62db64fd4. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/USLZJ2328063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a9bc3e57f00b85029340f0a1461f056b3951f45324abbe1cdf8b98fa1350bec. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/GBRKQ2349996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb4e2207d557bc1432fcf3e3c56bd395ae72f6bd965876ab2d239fa091eb480a. 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/GBRKQ2355767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4888b7f95eb0bfabfef50a0474c6fa73028f582980913ca3c833cee753a9795. 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/QZWDE2358219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efc866acfc5823f2800c154dc750290188b61d6f7ba8dcf9c897a3fe7502fc2. 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/QZZEB2396748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16dd9e296414bfc9cf1067e1c437c91eaf5b7ee1cc5e320b9c410e912f67354d. 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/QZZEC2302274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1f9835d2fb6b4b323a1029bc7160d1edd2c927e354b244a0966ad2e48d85c0a. 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/QZ5FN2417826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x038f31df642cab96fa397a6e995d61f94b83a937d1754e3a41d06da830998f21. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/GBRKQ2497946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2457fa10d8a6785c61afd607dd45d0e0f21beb8ad9d2fde5b4ce12697d455884. Chain 2 (Bitcoin): anchored in block 959054 (2026-07-21T20:19:31Z), 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/GBWUL2487161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2545e943f31df20e2d770ab7418cfd13c87f95044bfcc9917570843940f25544. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/QZTRX2495142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2fce515b3d217b31aa134e7a2d98fabf92981b080e793f5cb84e04b2c0b6fa. 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/GBWUL2497273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ebf11035465512109442e49a542be1f2b4a28e9ba575e42e356935a39fa126. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZ5FN2515644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca5daf60e869a0b5a8752a1cbf991b81393944373a0697cdae5dbbbbde31f99. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/GBRKQ2560664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ba531376844a6e5b78640dbacaa7bc5aa7585d1367d4fe160e1998f75c4009. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZTRX2589676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd24ab3027e7ef1e3bf5bdcb5e642e74d459e426b69ce4af8d0ea242e6b381fe. 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/QZWDE2500143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0180ce100a7c4c0e216f1b8edef5f79558d9d1d37fb74d47028fcbeb361ddac. 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/QZWV32536578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572471446f90be52898e351a91e7509912534cd86ea46d3868f51e098f754ea9. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZWV32535682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76eaf1e5e4203d8792539818ee612ec20c3df77adc1253e544e88593fae4ab1. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/QZWV32589005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff079e61b95f5cd6c1a6247964ad905976e9187725738505785138d9d2c8fa7. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T05:43:55Z), 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/QZZ8A2506783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0b3b6f5223d681820319a0a8aabec87c8035bda4543a4411dfb97c48896dbc. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/QZZ8A2569781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0c0abbbba99d66572cb573fa96a14eae4f9285a49d7633fb0745b30da8895e8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZZ8B2507840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x851a1c910edef276bdc1691ce17c96d3ae1cb6518f78ec1a3ee58d9853d2f1cc. 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/QZZ8B2517639.