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 0xb9c5cf83089ae20d9728bb11839511088fab189590b3c7391112d18ffa68df61. 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/5e961e87-81b4-4b23-9f8e-539c1ecbe1ce.json and https://artists.proofprofile.net/proofs/artist/5e961e87-81b4-4b23-9f8e-539c1ecbe1ce.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 0x88539952792df74b96f43120b76d07198a473f3d76ea623e051449072a10dcde. 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/TCADG1784481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c926d705d651e586f6d49c394724dabc2e2aee9047f23014385564635f985d2. 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/TCADL1834233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452dbd6cbf4fbf3adb6c06a893f1d7063aa77f91f8e8046b5299cc76e13ed30b. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/TCADM1857655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fee44a33fc2739feffc6b9fba92c193ffb6d3d5693c3f97e0eb5b9850fe446c. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/TCADT1869527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae17e9b1970ef9f7dfb52a59afb2317986d91c7efc58a333f2e2ef4a23092f93. Chain 2 (Bitcoin): anchored in block 958124 (2026-07-15T08:13:46Z), 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/TCADU1885237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc5489445913e2e5026ab1384d4fe0025b41b3614a6f680e36e919c18c12b5d5. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/TCADU1885305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75893bc99abc9103ab844604c4282d907191cbe2fd901a56cc7ec815d2b2397. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/TCADU1885306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00448fbeca17b9558e4da8118309021d7deb3088c0a65687b62a058295b1de6c. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/TCADU1885307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x143ca357d1e0cc890aa43dc88a14f5793e4b518938870b4ce70788a4601c6455. 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/TCADU1885316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb802b754d42c692b5024b459e684266d983a7b2c454a1ba09a6a239e61dca002. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/TCADU1885317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75b09edaf15ec6894d03fe1102b22e580c93c38b134be89fdfb3cb3857ca6f75. 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/TCAEG1938208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03723b4e7db945f34ec831495f9992e990803926c3d2a9a4989c14661a0bde4a. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/TCAEJ1953626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x255f9031b05f12ba8d11d6ad9504b712130558eae7c05f33b0d94fb1746a3f8b. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/TCAEZ2003588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539dde68916aa3c276c521352a70f301f346abf3da3863b816f196e89271c7d1. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/TCAFE2099835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0252aef754de234138bb8c30e5c8368bb45bbb02c78115a9ece514eed5ffde94. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/TCAGE2250535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36c9e54c083b4940e1f4beaf67b023adf602a176d87b6d063a889dbcc7c3732f. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/TCAGF2253268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a67d88b5275faf790ab8a972e86cf5bdab439891bfeda358a14bffcf7a5428. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/TCAGP2276382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bdae2d5b1d021a7b6dd2a90e3555b075ec0f495e9adc681d24afc774d8c2e29. 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/GBWUL1920446.