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 0x6fc70390952fda497d11f6c9414ce82f27bc60e81019e1b2dfc99eb89389b499. 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/d6574a15-620e-4e85-b0f5-ce448038d807.json and https://artists.proofprofile.net/proofs/artist/d6574a15-620e-4e85-b0f5-ce448038d807.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 0x843fac327740dd7e909f4ec9451e2bf9524ee7a1a7556988e78d8a97f64415d5. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/NL2VN2300275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a45ecbf8e594efc4ff554c783fcb85e627fc76dc98942758e806b7d99114bfb. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NL2VN2300274.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b4ab1780ec452341e77b18cbececdcad8bd71cff0d003a319e00bfa82ae6081. 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/NL2VN2300273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23ffe90483c243aadfd2f3bf35c529a496b7dc5c60ae240b75119c2ffd077528. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/PLZ632090023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a8bf0a48beefd633be2d3a24b533779e9ea320a9bc6b1e5b965bf51a0e3b2e7. 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/PLZ632090000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x913fa6d5f33060c77c454c7f4c6792fdde497f4be3eb58149022cfdb7c297e38. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/PLZ631990072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97cb5c976e56ebfd5ee0d23eb496efaab4343cf6ad4b75adcaba9f7c2dd35d0b. 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/PLZ631990048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f5fbd30f3c8a44f1b10476a0435f8cadbc2a3c88ce3fa86fc745b351121381. 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/PLZ631990000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5830f980f0fd3c54ef1fa8bd377e3ea7c569ece68983c71dedc2f915a304030. 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/PLZ631890091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf76e42d09fe11fa88def96bb97b39973f8b2d81111a81ac0bff07880bb645e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/PLZ631890068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c7649edaebecb6cb243cbe962c2ab1595f0a387580b08d651194aecb09079a. 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/PLZ631890054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7545ae3d6a1875b3194209697b3a7d89d524601b7b31caa5924aff1002bda8d4. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/PLZ631890034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a104db5ca0786f54e6ccb75478d97f40120e9f7ba4804678b9033a703b34a8. 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/QM24S1804228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e29a0504e5bb67e255a9cb476eb1ae45dec429af1a65e7f3986a07d1e277c49. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QM24S1804227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56d05eb455127a9f17bc55b946a7e49cdf28f8b177c07bf537d698d25cfdc212. 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/QM24S1800798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50d07de222a18e3ccbcc5e9b2300fadfe6494fd6bccde26a22bd4ef35fb1571d. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/QM24S1800508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72a13ce3af8d92874b95e640ad5cf6d75cc459dbaaf2e4d2d5fcef4db984e4ae. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLZ631890017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06dd42ec27ff1edfa50c137ab775c5b7c096e908c324a22ea29c36cda695d30a. 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/PLZ631890004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eacd2981bfcf55b40abb195aa7d6d374888368cec7539011f458c0aa964df28. 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/PLZ631890003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76346b72a672c26662de3849a575cec8be84d6d3fdc74284a3329e2934acce79. 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/PLZ631890016.