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 0x4c9648764d2adab98a93f611e83fee3bc7d898325c444524422771f633fc9d04. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/078445fb-40d2-48f5-a852-eae4687d337e.json and https://artists.proofprofile.net/proofs/artist/078445fb-40d2-48f5-a852-eae4687d337e.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 0x555fd621e1819f6e9ebdfe04350b0f63a5270e1a1f07d73c40889dd6ba81f923. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZES62274614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ba44f95fe0dd0d1cec3bdbbe895ee10b62c48b574c1fd0cd18a9381bcc58fc. 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/QZES62274615.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7c0b93e2974cca50af895b97141f0487b74637523c56c11a3ffa12cc42a5ff6. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZDA62357248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x595dd4fa4b9aff2d153c6beda288ca7f90770a8b7253c0792c9ba2c2226d93b8. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZTB92228924.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bb44caa4bdffc931e296c77f8191bc783a37edcb22044f95a60c768fd760e46. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZHNC2179712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb64a02ff3ecae28000e356318786cd3e3ba655439a417818eb4aacda8bd641c. 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/QZTB22299461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892081e7fdb0594199f9a47925327bf1cfba72123479926c9706dd9536b14b77. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZNWQ2183043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58cb9b5299c833255605578c2834ea5b04c105ef1df187ec64ed7eeb784cff4. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZNWU2198835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab2d60a802840d83a5e0e66bd89eba393da5d6fd09c335f841c115fe094c74e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZPLS2190727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6a93bb1feaf2ab425ba92d6fd5e80c63b62f78685736c2e6cf8e92a3866feb. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZTAS2116608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7db8ce10ab3b185cd9520909279495e74d25d7a5ee061dfa82b30db3dbf6b44. 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/QZTAS2119203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fcdd274271929c66286f2908221d65b6bb60925c0b6b5ccfc51b4c0ea115ab. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZTAS2148280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa17085cbe4588bb36da3be44a7c32192a6c5afa673dc756b87efa2929170e40d. 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/QZTAS2150237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a837eb21c65df980ac9ffba6ff11bb9a5c4f4c3cdffb532e8bbd0772a15ce7. 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/QZTAS2146712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77441b7e5da414811e95ced87732493a0da5ca6b7b0112d116970b51ecc452f. 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/QZTAS2177471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519b2f63ae829349511084af334277945efe75f1f208c906d4fdcd1bd6e28e5f. 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/QZK6K2290214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0694f8783af612c8785ad9faaef2c9c6e4477c0f70638444d140de69895108c6. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZDA62202519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d21d57b102193ba914a3c92932f84755a978c252b6c29a4e103e27a4afcb44. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZMEM2241598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e633a26baeb2557fe82a72122c438bfd0eca6a7a60be81a64571e55348bc7d. 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/QZMEM2241599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc091b9d78c4b0ee9816e1404eadb86d94861dce72b37e92b664ff4bb01358ab9. 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/QZMEM2241600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf424a97b2cb2d8c4337e95c5b1b8455c8b7b6b96fdc6924d922571ebc5a005a2. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZDA62165313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be5b6016fefdf4f00176e4db36122941ca1c9ed61659a8ce2471866e6033797. 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/QZNWU2386294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff984cb790660bf1448673eae1d120b91a4f0b998052a944ef91d8977dd07c4. 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/QZNWU2386295.