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 0x3d71cc510dc2f29359ee370e9272be2260cf525cf9c7173c84c3689192933ce8. 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/97874045-0259-4e5e-a26e-f058bc0831c3.json and https://artists.proofprofile.net/proofs/artist/97874045-0259-4e5e-a26e-f058bc0831c3.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 0xa9e275aa2906d2943c8bde252791d58e013ef3e05746076a200b304b5e6d8bb3. Chain 2 (Bitcoin): anchored in block 958079 (2026-07-15T00:21:05Z), 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/QZFZ42092213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a613e0b734bd5d95104a0ac6cf8d74ebb8c1a652e67ff084a52ca6a444ce127. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ62041016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90a08214a357db65f67e56b6f687e4622c275aeaf3cfa41e92a991c5ca8749ac. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZFZ62041018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ca152c732fbd38331a2231f1df4d96fa56f07607075b14e4c21b031a8695a9. 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/QZFZ62041019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39632283735af2b2b6c66503bceea4c42b49a34964462d9265aa5c16334f7567. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZDA52006014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddd558f00c27113fad0dbc2259d1675f9a1a74f0b235d41851fdba43afc8ca1f. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USANG2133494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad3aa750fd879a7b34a4fec41979f9676f165388b74c8143df873d25af9a07d4. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/USANG2127005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29658e71d7e5bc68d12935dcd6d2869a28f22ca41e2535d5f645db4e149a4f7f. Chain 2 (Bitcoin): anchored in block 956425 (2026-07-03T01:28:11Z), 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/UKG2P2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc2d71ca6ec56eb7c90f686c3830d4395b97ab057f8fde9f56f3602e5e9bbef. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZDA82184933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f1ff90683165e77e5550eff387c145b866947dc03f669178e45b64c71b38f7. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZHN72135963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1711633ead8d917c02f67a00eb6b62c365a438155d141da44c68e4195ea7a8cf. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/GBPS84166606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e9a836202ee6914456671467453c0cc55d2da543c6f50f14e315928e08a5f28. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/USANG2219741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3502e60d6dc793bad5342a489e0776482e5e6f0f0f42df4433b5ee83a8c02f75. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/DEZC62207075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2829491908d082472e61d2ea4e5ae04dc9be7bf11199a29c302d6afaa4cb08bf. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USANG2261872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679b39583adc34a4d52b86ed0cbbb448195fc087f2a8d382d6007368e356ae20. Chain 2 (Bitcoin): anchored in block 958495 (2026-07-18T04:39:02Z), 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/DEQ022370315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x536dc8cf52e008ae7025f1d561737c5e16b5a57991076ff0b8c8a4a09fb415ce. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM3DF2252611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36f14b732ac221b8b94d1e89f9f427b6aed0e68aeeed82e3ec8c3db9c995f6c8. 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/QM3DF2296816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d64fad422e9f07aacfbb26935a8f46e0289b0c38bcb7ecb538199ef2f23f959. 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/USANG2210144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b152d9daf9517bb285926b81c5b891e9a4af21cca8dfeeb09cf3238760a7c6e. 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/QMTND2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093d6951af263a86467708e25a3304d015e323c66fce6b512e3220f64a2ba83f. 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/QMTND2300059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cebcf1e35433bf42e869e52769d4ed7c91c034c189f6d1acce15d9f834653d5. 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/US3DF2230493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ee8780f6aae58cbe88ae4ae58ce3bb738c56532dbe0c36ee07ff5ea20c6affd. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QM3DF2175190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601c320e8756ba7d424d3edeca0031f83a2dab8af77096b7e3df8abed51619ac. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/US3DF2244564.