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 0x6916154615a0ebd8ec9620a21fc74a10709aceabed8affed7560cc54310d406c. 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/6e492e50-aeda-4aea-9576-24ff09ce4f71.json and https://artists.proofprofile.net/proofs/artist/6e492e50-aeda-4aea-9576-24ff09ce4f71.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 0x5c8ed2542963b3fadca63d31e629eeec130d6aa73188fc06102085bb8ce93685. 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/NL8RL2428032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f9a596154e2433c91fb7e6a34bb28fa3cb7e6f68ce8dc1e8954f679dec2c165. 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/QZTRX2474416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5324420777839f28e452792fd84814843b1a85a76d7d8537f26725a54dd6addc. 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/QZ5FN2469093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fed8ec5dd6fdc994347a8b2d2a52fdc4dccf0bfce2077bc70e965b7f7664382. 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/QZZ8B2361728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc602e789ade31c0ba3cc8f38ce514cb2c1d63d899c029dbc7cf87f15d0a064ac. 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/QZTB62370736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b0f7ebd23d40432658d5d30e5a7b868fb9c21c669e553cc5004f1784ab0140f. 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/QZTAX2386105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a35c79aaef598e53a584f30b5f363fdd4779bb203ff4560ed205cbf808fbc2. 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/QZMEM2399831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x251b27869040b4252e82cab3f2133d1d6eb72b5baf3ee1936444e461dee3d5bc. 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/QZK6M2368137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db861600a9ce32a290e63af28be28555538a38323ba541ee89b799be97d1dc9. 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/QZFZ42383908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99032853621c7e6172ebfedc6796991593b865b1c4e8f093b3bde28fb2900af. 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/QZS662207428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f13cacc97053a102bdf69b31fd157e09a60db366116412cf2a783ab168dd16. 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/QZNWR2275887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0e657a0ca93d8e8364cb3a6ccb79d150fa05da41885062dca7f6cf010f48fb. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/QZMEM2264814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6753b20b6f12758cb7d35a114697b6cd47c3a1315ac63e3a522dd2d8a550fdad. 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/QZFZ32230311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc895f62d0e8bf708eac6b6e63c84d9ced2f05eaf7aaa66c2d6cb76c37b7f791b. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZFZ22250085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ee26a4853990f480395d39edb3a069027da367721ce3e410c2502a78790970. 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/QZFYZ2228713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56d57e865d0cb7a843dd92c306eea9aca9f7cf1bf69d18fce374bfacd1f3f52. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZMHM2035287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932593adb954327c01a019833be9b1d10917f36ff3d0b8d9a331c7e0cfdcdbd7. 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/QZES82129348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4916218a4975a77ceb56dc118cf2f235e8dbca1cd9dd19634f467555e1b175f. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZNWR2037929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7c696dc4e543a95ddfd4e6fe659ad617f1e9fe07d13607037b136492655fad. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZHNB2045345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7687ddda142d9bc93ad3a9ad2a6f3b59f3607fa51d9bf1d23b74f8f4f7356e6a. 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/QZK6K2111963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53ff551159bf1d5323738e6085c2ab2369601b15ab4a06d017328b3bdef4568c. 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/GB2LD2410561.