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 0x9ea841d69f9b7cc59df6ec0dc2f3641f45a96d1ea72ba259d4750a3bdd62b795. 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/7ec4b296-3d42-48eb-a939-f82198d95ac0.json and https://artists.proofprofile.net/proofs/artist/7ec4b296-3d42-48eb-a939-f82198d95ac0.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 0x00f309932d0e2c7729d665435590e6070986d1148408a06123bc6fc4460adedd. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/GBGAC1100030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d236b29694345ff71bdec44cc0bbf1899756b882f74c3905d29258e267894ee. 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/GBGAC1100032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf5f0cf7cf30fbe30bb16c6669a00645377953739bd95836fb1d537978fdb6b. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBGAC1100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ec7c1b1d74aca20d8d4daf319368d0da7e9f32d18bcd436c7e20d6e532a496. 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/GBGAC1100036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93a36bdf634d5a1439364891c45fc38df8817e1a9dc7edddfaaa51a7316a7d4e. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/GBGAC1100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0918b99d2ceb487cc0ef1fc080e4654dc91483e384f3c517e5dafed71d264c. Chain 2 (Bitcoin): anchored in block 959003 (2026-07-21T11:57:43Z), 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/GBGAC1100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c2eee27dee9028101d12dac66a41bb5fe70fb84cd5e1be77f1cfebd4d45807. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBENL2002723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b3b60ba1e322e31d437bb630016c47eb303f20720f2370c2b8c1083ca43f9b. 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/GBENL2002721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda36e82596acfd9870ae65e19312158a85eb532aaf42b3b773a553cf62ec19cd. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/GBENL2002722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69d66cfab2d1fffe05d0c049a609fb459f8f3e14e14261e3346a5800162fcdda. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/GBENL2002725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x182f3160bc62387fe0fc1eb4cd2640678a772161e07b7f9f31579b5edde19eff. 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/GBENL2002726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948cdfed8370a0fdb8cc252028ad8615df964f695fb95e37034ce10b0d83a128. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/GBENL2002727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818f8b25f5e3e6063bf37a76f4670f175c4bfdc5a155c8b977158f7ab39e5253. 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/GBENL2002728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b35b82975b61b807fd6107556821b5496e5b2cd75829dfc8e5c432d5c5b153b. 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/GBENL2002729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404b7412cd5245b968e545efc4d54260f7850bed43ae9b3f552847cf15642819. 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/GBENL2102900.