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 0x77cbd793b7bf682bf3267c549119d03a29de57a254f66a69d7e78447932a635e. 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/fb4c74c8-e86c-4eb7-8441-f3b94ab828c9.json and https://artists.proofprofile.net/proofs/artist/fb4c74c8-e86c-4eb7-8441-f3b94ab828c9.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 0x7cab861e4b32f28a45b7ab7ab01e4e3ded12de3114298a406a20b842bb6d1166. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAY2223595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21187b0909efc9d283871808364d696538a76b6260ccc998f3c663fb2cf1f424. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTAX2252052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b4f18f10281616c8e0c7c50f3177a12661f2e6c626bb1bfff103f784e25e35c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAY2223596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551b7e9e403e3fed16ac26df02210184d156181fa15eb8e842d3683518e40019. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTAY2223597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756d549584f7c3ca9d2b8a7cb1072ea7adc5846971ffbd72524a1796c5f7e79c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFYZ2203600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25786fc966140319c2898b6379f727cf2a8c4cb3746b7285176457d40ec59d2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTAT2251297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f89a4fba2d74c6be26ea3e722f5ff9665c7d949adb8db367e6d81bf63c9542e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZTAY2223598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f80eeee870f8b978996110cddbb41ee993fd491650e2374f2680446111e025. 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/QZK6K2470076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x072012fa0996fb6154969e500fdbba0475471c9f7016e85789ffda0ba9a0d26e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZHN42496699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1d48dc64a67c6c82d4d367ebf62a0ffd9d67c7927b5c46b7e6fdf320cec886. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZWFG2334428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be26ac1e2507d630b367f7b5a7063015256e1849fa3fa4567e4f33890188e98. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZTBA2349059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46785b7737f7b34940f2923080996528d98551b511439cb59136edd8656668c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZTAS2383268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5283f13d6e43bb9647cb3663f1ab46012c58a9742c4daa4d28e3f592b59db7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZNWQ2358560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1092caa98bb5277ef7ffa05ad0ae86285092dd01078b6626e6b2de6e69443626. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZMEQ2333839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017789e934005e680955f952e9b4b5f3e86b5d948b5a7f3633f06d6c5dd51b74. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6N2322042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21187b0909efc9d283871808364d696538a76b6260ccc998f3c663fb2cf1f424. 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/QZTAX2252052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25786fc966140319c2898b6379f727cf2a8c4cb3746b7285176457d40ec59d2. 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/QZTAT2251297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x756d549584f7c3ca9d2b8a7cb1072ea7adc5846971ffbd72524a1796c5f7e79c. 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/QZFYZ2203600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926e0b84a75bc0029ee595066e003c93e37d3df01e4e32b6261bb8417d08abb7. 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/QZFZ32157725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6894110429a4892aa9092e7965d20a4d6c970db78e54dc6f7238ec0e755c53. 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/QZDA52166437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95078158ee2efa9b94ef224cf891392a9b5b060ec3bd0329682fbf6a30b71e4d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES62134676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdf737247d20a7bb06476c8e5c06824e2b55c27d37c9db89fbe245549f97d9a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZES62134677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6f4a6f77bf253d4f897d09f40bbf11966d8385f73ebec590dd00ba9459e40e8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZES62134678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e54cad076bf0095e9b5e0f9bca1d2dbfd1fdce9f6358be7e45f132aa4511d3a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES62134679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6894110429a4892aa9092e7965d20a4d6c970db78e54dc6f7238ec0e755c53. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZDA52166437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926e0b84a75bc0029ee595066e003c93e37d3df01e4e32b6261bb8417d08abb7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZFZ32157725.