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 0xbbdf84a8bc46474874bf6d095ac1109f1345acd16e9d918837ef2b843201b7ca. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2258df9d-cc3e-4a58-af44-939abc61ae9b.json and https://artists.proofprofile.net/proofs/artist/2258df9d-cc3e-4a58-af44-939abc61ae9b.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 0xdb4324df57be736814b6338f2264b59edb1dc03cb995ec93d52c88dc15d17def. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZTBA2364639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab52d2a164986b99ef1cfafee85fbe8eac0b938f03467100413d9b773d12a1a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTBA2364640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe05d007ef54ddda3a8a030f4c3488a53493981ea0dc1ba741aaee2ff9daed94. 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/QZTBA2364641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ea0acc10fa01af57793677bbb2f2fac811f3e77d30546064cc1781a5d36b58. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZNWU2441728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5580d88fc84c0a672ee230b57516046729098e5510c9aaa8c0a84a97394dd7. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZNWZ2489189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e5580d88fc84c0a672ee230b57516046729098e5510c9aaa8c0a84a97394dd7. 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/QZNWZ2489189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe4760c230f103d717a0608edd790cf1897d68a83b31aba509326ee316c2bcd. 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/QZTAY2485444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd865601c71a8bd5761e1668a592d988528cf3bd1200b0182f08dc266563fae22. 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/QZTAY2485443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe4760c230f103d717a0608edd790cf1897d68a83b31aba509326ee316c2bcd. 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/QZTAY2485444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd499e8b679622f65cb6406562054959b902ccdfd2dcd47dcdd9796b037a09c07. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/QZTAY2485445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf56cc89562494736838e6f6ad65e10d0c629b9521873c2923ee7b5b404129d1b. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZTAY2485446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d4c29671a2e0bd18f1cbbcb0500881561528cbb3a3089d8ab5dacc0456962a. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZTAY2485447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb9bf902b52655a1b7e3c71273b319c4f61e47122266dbe5913e1a972983f28. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZTAY2485448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa824becba98f79ff361b59ea19d584e02c11856c1e6bf71d1120883474608808. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZZ782449878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa824becba98f79ff361b59ea19d584e02c11856c1e6bf71d1120883474608808. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZZ782449878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4df2d77dfc445b83f12c96602e02cd0f22acfb46714027e1a0c86ff988d2c69. 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/GRSTY2501624.