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 0xe2edcbc9a735f42e606bb30fdc15bef2ffbc84e57316ebde8ba0c0e8ea93b3ab. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8b3a6f40-362c-4842-9e01-3ffcd46f404a.json and https://artists.proofprofile.net/proofs/artist/8b3a6f40-362c-4842-9e01-3ffcd46f404a.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 0xdd031e20cb391e0245db491a903cdb54695779ccedcd22e59aed77e4a7d30db4. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/QZWFK2442547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f353fe0ad32614b1600639e21a46fee6b4d6023b25c44383c561b0dde955e6. 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/QZWFK2441951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e66fd1febd61e63b96e7ecc3f018bcfeab26cdb0e94de3b2cbaf1252ebad6eb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EX2429415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15033124e8802b2936accb27feef45d745e31a69c26b73fae2945ec7a937d087. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EX2431410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x962a79508a77eb5ec56f01209c17c41935676765d177ced6b068d3e3971b89a6. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QZFYY2564223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d3d996a0d064f250b128cb406ce13a91d7858544bf9b43faea19c29cc9ee4cb. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZFYY2565521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3ad9d0772ed2b7064cf3dca637d9cb772700a02aefb11f56dde7cdd7917644. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZFYY2565520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x929bc21d19c3308bc79aa1a49fe95e7d22eeb9fe3266d8227fbf65a84c77050a. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZFYY2565515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e7f10a1a2335db4228429c390f5a484a671c3e49b41e712af88b5fcabb4bc8. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZFYY2565513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f16faf0ad6f8c7a46c77aedbde6838703ed33fc6bc18375b586dc1533940c12. 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/QZFZ62549505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ae52ec3369dc9feebf1f1a8c91224108afea6fc920ff76837d77a693ac0e4e. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZFZ62550699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeeb74aad5ed802213da89b8dcd41b532ca4f9eb9b32871e975369cd0a4014003. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZFZ62550696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522797772287529bc53729f4fc454fd4118385416c6c07ace441079cc527d387. 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/QZFZ72500303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67502723dc94458f038f213716fbbd9d3783d8631f7d42ef53758b449533d52b. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/QZES52598339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x138036f29d7d780eaa5442f289464669d86adf7ee72f78fc7db05eb6843e45f3. 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/QZES62500681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc796ab320359e6485fa57f82d2e85d52d2dcbf472e33b2930371f89a904afe. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZES62500661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaab880ddac0439114dd4360d4f4a3a626463de671a2a3f2b2e45444685c2dbf. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZES62500659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f768f86729a012c9361517ea7a736d92d51b9a97d3e3e1e8c9551ac4397ab89. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6Q2525716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41be86687b37f003b0dfc34e28c4024a71403c3a9a3e590cc704feaf4d698473. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZK6Q2525740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612aebb8cac26b179a442f708c64a2b09788cc1248bba4aa5b16b07f414ab742. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTAW2521902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d71208bda90ecf0b90744cc55d703635277c07ebe050eba12759abf312244ba. 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/QZTAW2521901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7302dfb2290c28bb473043be0761b3a11d293f6eb5bcfb48c81b306635a2cd8. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZTB62562774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6698e122ff454021a0dcde40107a6277ac13cf2fbb1f48b3d0fd1141c18e6547. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/QZTB62562777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x607b3110f0f5704eb82c9f36f261ef4568008691f70f21ac1d3c1cbdd51126bf. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZTB62562843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37315b2ad359ec7e6f86202f7a1bc6fd0b470a3f926f7e1469ed92f0556eaaf0. 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/QZWFF2563878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03a04a44ddde16b5958b17b24bc4ffe2e359013bb2924373b9ce845670dec55. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZWFP2578111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d92c9ae645f2424e451e2195157f7d46857cdebe5773931bcd30dfa93658dda. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZZ7R2554123.