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 0x45847ab9dbde93be6a5caccc5fdc9a83431bfca374c1376326af3b9e99fa3b5e. 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/73d32695-c08b-4743-a858-12cd2275580c.json and https://artists.proofprofile.net/proofs/artist/73d32695-c08b-4743-a858-12cd2275580c.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 0xe3a659076fba0dbd219bd544e25c2d094f62cbcc45e4cd8264dadd6ab504ac57. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/HKG732289381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6182d15f90874a318d00c12b190a291e5fa4177443ca32b631d39868c7c6ae8. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/HKG732289383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38909c1dd57332b40b2486a13247d3138df98a012a3111f3e46c4e4e7f29746b. 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/HKG732292187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfe42f9b6bf8e0d81f3bba8d01637090d3d6ae71932402f1107b1193af31d65. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/HKG732305334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb27e3f07b7aeaededd0431cbf7acc1ed977476c2c80335267505920b39e221bf. 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/TWDL72300828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f560a7cb68a695c4a87c27870d555e275cc257ad0b1e4f69f5898ecd8141f2c. 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/QZJPM2465734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4354f68a296c3628ee7c35fd09f4d9e3b83cec1857d34b199ad69e7088931022. 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/QZJPM2402070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8853a8ef3fb911df0907f445205a0c626738561dbc0e1a54561f120d755b93. 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/QT3T42504873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8853a8ef3fb911df0907f445205a0c626738561dbc0e1a54561f120d755b93. 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/QT3T42504873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5ff65773217a8669823d9747eb50eb3d6c1879f10167c20834c88759b5daf3c. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QT3T42504993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8262207960f7749fe9262fccdd42c85e89e804af86ed79f8adab796638512892. 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/HKD012448564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae96cd6537ec229fcc34704d4504eb8974b6817d025f13b2e4518dc69a0872c5. 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/QT3T42514284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ba9ce1cec78a35cdc747b9684e54c35e188426a0993ab3656b283909d309e0. 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/QT3T42514252.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0979c54ef83818652960d45fa9c5a1718bffbce666491a01614332d6cab46d2d. 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/HKD012510360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2986c63ec6895de207102b2019222f1a03ca5375d88612381cd99a1d76510799. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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/HKD012518359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18abcb6e9884b83ded3db9c373628e0255243d13e32355e9a7a7464e5e544299. 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/HKD012555467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b1fb9f5a14d8709ee86b165e9fa8c76f61f9a7f8384c5e886dea6f3f42eed67. 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/HKD012556025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55974c6271119c5329ecf1a844e60878d340c583c983383ab45d970fc72261ae. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/HKD012624811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad877bc2ebac327a9bb55bbed727bdc83d6f137a6e281df0c9522f3912a835a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/HKD012678861.