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 0x71733c8b4ef008e3b09351d3fa7dfe13108e43f8610c70168ecbcb73c0833ea3. 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/3cc0b99f-88ba-4797-8674-9cbdeb4e0093.json and https://artists.proofprofile.net/proofs/artist/3cc0b99f-88ba-4797-8674-9cbdeb4e0093.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 0xada45165343ef4c6f20a5c631d6413686923ccd9e1d8e49d4318022cb4d51711. 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/US3X50403806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x864c4eb3e9c08495de2007fa8d894216a9ff6758f3973ea47873da5c5be12553. 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/US3X50403810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x507602c7c6247b2bb1877bb77617319dd7ba0a8ec0298352fc533f6849827883. 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/US3X50403811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a9ff3260daf8d7b75b52d8e4b9c68e77b49fab3271c94f43b12f93a229655b5. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/US3X50403812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed550573737a265566ed2d70e3492e792bdae477a978f99ede8ffc04dd2c979. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/US3X50404701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d50b17630600ca28f4fb936a6ce252fbd7e682e730933307db16acd0f32f5cf. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/US3X50404702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd5b414084bbb7a9ad20f204e39c505c103fc4bba9afb1d55e17a2802267a615. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/US3X50404703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c259b14fc208f5f6f91c63b0e39a63f91363ba3e86a4550dcee9d53f7c13bf2. 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/US3X50404704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835434f22fcd50332d8f559ff8d98e4dfd4d4d13cfc563d7afbb1801c52a52b7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US3X50404705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878b58dfbb8b1d6a19e23074d16f160ae5c63e895b346e09cc324296b0bb8cc8. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/US3X50404706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd5bc353727ba792e90bc4fada777953ebf39f31961eb5f0080665d4c2ee06ac. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US3X50404707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c4f49a452d0fd7cca93ea40e400c745ed1a2860867ee29b1125287e1676e6a. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/US3X50404708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ab079189b3ce8689d93e016f368a270ce0f3bdccb8690de3de1a46617499359. 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/US3X50404709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a1ea4dd23e1ea89a7f3997cebeb8771c347c3a92646800f42475b880f96dea. 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/US3X50404710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac5ac683c3db416ba3be5d56e9c9a12d62715806be6b7f99e467b0e611cc5ce. 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/US3X50404711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc92dc13fc128a33420e3fc84073262d885be19cc0f0d88f50f2cb3f3e7f53457. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/US3X50404712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c6696609ed767efa44c9dfdaae9cafa52517623afe6ededa221e368b1cadf71. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/US3X50404714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce718217559b2fabcdd4081d573dc97b14fb6cb459c9b0cc3193d9b10ddf22c. 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/US3X50404716.