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 0x69caf2cc9f73f457db700462b3c8af4cc4d4376568354e9e11a2a9ccff1f82b8. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c064b0b6-440b-44b7-afd8-ce10157f0ef1.json and https://artists.proofprofile.net/proofs/artist/c064b0b6-440b-44b7-afd8-ce10157f0ef1.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 0x216d4b5087059bd7813769a3f7ab36ecc1039e070c321e3e44493fc7210a66a9. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZHN62422441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x254e2dd6c1d730487af7dcd9c6556b5a149685f8eaa08d7607bd2b3af009f5fe. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZHN62422446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x539323b8417cf3be259503978aa7e339d1987ac46d96cde0800dbd73facba0f0. 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/QZHN62422461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9e922eac1c4509d2016d20c69904a16f4bfa2dd371220cc027aab806547e8c. 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/QZHNC2494490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e24d18e4c5259cf6551defa55f2d701658d79c26a140e6d9219114f6ac8780c. 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/QZHNC2494494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18e8a49354744c2378fe5ab15b52a9853faee9e496fa2bd4b4474a43cf7e79a. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZHNC2494495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e161059e9ff208b543dc64a9e96a2503738244aa5d759285b600b2ccbe89ad. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZHNC2494496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff99ce22d860158c33e7b419e7ed70591e3a85e0bf539a7bf43633759ad8e580. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZHNC2494499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63f06a41177ab313c87cd42ac026d37f91acde4b2e632bf2018745ac26070f9. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZMEP2486160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1552f236781128a638bd988a99019617344a46b86315087f318af2814cbde2. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWT2489625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6517214bbfd5ebfeaa9e7f3475993473b076b4f7eb1ab40fb0aecf617d3befb. 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/QZNWT2489626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x863090b674a5dbea5918bf508bc659755fce45e4e09ea3d8569e2c8fbe320574. 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/QZNWT2489627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa0813f8f5d5694fe2c5b3589273fcb703def5954b028ee041463a02bbda349. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/QZNWT2489628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1081394ffd9d916e5cb08d2eecb2baade85a088bc37874e1c897a8a368a0c205. 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/QZNWT2489629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124395fb003015ec185c26902be963cf7332d28543a265c515d090ace6d718eb. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZNWT2489630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9b5bc1f1c3e61a5c45d00dcf96ee77c1703fd0e7c6984eef6e21bac613f9e3c. 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/QZNWT2489632.