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 0x89e917cf7fc662b07fbb2c6210f60854914cc4b2f82dd0943f0c8b6ede244889. 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/54b3c328-0732-498f-aaa7-3e86c1562b78.json and https://artists.proofprofile.net/proofs/artist/54b3c328-0732-498f-aaa7-3e86c1562b78.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 0x71f6a2639beebad1e9cb5f93dbf7406f2288cecf2a991d2a10aef437ba1a3c73. 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/US83Z2239795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa72f810c44f40df917c842456bcdb36e47ad0459a8da9d4236eca9de2da87b15. Chain 2 (Bitcoin): anchored in block 958169 (2026-07-15T16:16:18Z), 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/US83Z2301279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81253c9f9528a550fe20311835eaf603cb9f6f00237d4cd12b743ffbf9f8117d. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/US83Z2304051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59534863aec8253a9630b0637cbfde95928405a6590de3af6b75a26c4ba8ab55. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US83Z2309481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe91dfe4fb9094dba9102c19ea8c3433c7cc789865b3150c06e99d5e39c521d5. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/US83Z2306394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67f5eebe0a49693c82ff0c783492360123886e98de5a485f54077123b34b76f9. 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/US83Z2311212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa7968e3563f7b1080f982583864ee3aa0092cd25e7810bee98e008686a01f8. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/US83Z2321320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfea62e5f5517fddafc1fe7861145481332ab4bc0c8e4cdcf917d4628107c7ed2. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/US83Z2330131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a687c565bb3cbfc3e2458e901e1e0d879755a99a8c6e14b39a67846454b99c9. 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/US83Z2337799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eeb9014c4d979aaf2838ab4c8eeaee533b0f67289870cf2a556e303498e406c. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/US83Z2354644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5b1524f846639a0d687ccc369eff7571e9a4b352391cde19920eadb604df037. 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/US83Z2464044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f8e29171154e309db35cc3c715120be80535f46f2d2dbc468fb8b664fbf4576. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/UKR6V2480952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07653063374e79905c602a1be4d8e651612bbc212bd95f8a2c8f75a61a040ce4. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/US83Z2471603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x011f8d66d3769e103e6be823052570d393791e5cdd0e8bb5e5f1aee5fa26eea9. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/US83Z2477096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x815afc0b78963b1140449a1bf64e18bc911cfb911077c6eaa7a8e70471074ce9. Chain 2 (Bitcoin): anchored in block 958303 (2026-07-16T16:39:24Z), 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/US83Z2523596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15306e988b975cf576c3e22aefde8a9f5e8ae74567268ea60af4af795b7e6f12. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/US83Z2347855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5af532197f70ddcde5dbb750a850cf65fb2faffac71746b78b8ff39f2177d79. 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/US83Z2354750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc37ca5d80be875ff72850c7540275fe23e03302cf9c0352c9fe6e519df88ca62. 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/US83Z2238035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15306e988b975cf576c3e22aefde8a9f5e8ae74567268ea60af4af795b7e6f12. 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/US83Z2347855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959ee9a55b23fa683681135a7234c2655b58c8db29cc64b92abe4b41e2b5d513. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US83Z2303772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959ee9a55b23fa683681135a7234c2655b58c8db29cc64b92abe4b41e2b5d513. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/US83Z2303772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15306e988b975cf576c3e22aefde8a9f5e8ae74567268ea60af4af795b7e6f12. 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/US83Z2347855.