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 0x0473d3d8bf4063ce58f38133e45b6c014d564a4d9a3aabf1c2fd66b5548b8b28. Chain 2 (Bitcoin): anchored in block 953707 (2026-06-14T23:22:21Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7cd5a8a2-50a0-40c4-b7ed-97189b341afe.json and https://artists.proofprofile.net/proofs/artist/7cd5a8a2-50a0-40c4-b7ed-97189b341afe.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 0x03d87cedcccc009c86f9d6ce4bd955f239674635a2dcdf7f876ac7e4b83f2f24. 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/MX4971515199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50b452e265eaa288fc956ebbf1cddc81ca1bb0caae868552cce7b714df9ba465. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/MX4971515202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e830b501b67fcce5351f69b9741940fcd02579214618536c0180debf0ce98f. 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/MX4971402659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5f6d55734c40dc58fdf0d779cb57512287e34a4f6cad1a69fdb3e758631e2a. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/MX4971402660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80cd8c70b47dad0005691be8370d8dc6bf649f45ba1c9059f9ec52b93bcd5a90. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/MX4971402661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5797dea8164f7752050ab002ca080467df0259ab39d0931d37378aba8336ccd3. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/MX4971402674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68cd1f1ec9e999a09bb6d67326a863a981b1481162623418c9b395980d809e0a. 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/MX4971402676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e5783d5d7e41099124c3a4cc2854cac6d9add6ab7659091aa2a62fbeedc962. 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/MX4971508259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794da51b40aa5cd1133128def4586035195a0b465301c01582e5685521764b72. 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/MX4971508260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea7c29f6b83bb475020bf229cc62e3b3623cd2dd2118f42eb7fec52b6b9d451. 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/MX4971508261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a84f2d9d242339ed3e2e532ca1ef3c3203b9c4d516a1ab57d96538d06cdbf2b. 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/MX4971508262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf66a6a650b4d2ec0337b383f759c174f9efb2ade78cfa3cb22add6ad7771f9d. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/MX4971508263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9591f30a7bb247349d5482ec951e1a10322f04596b7fa5863f24a50dae9da26e. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/MX4971508264.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fc767cf505fcc4ea80ab5476ec52ab5fabed14c7a5394805b6d6835e6717347. 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/MX4971508265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9e313384b1341b1859167f68d4a4877855b78dfd3f32176d14b66820b31877. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/MX4971508266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0ac06de795ba3367653e2ac6b7a25fd8867a21388dbb6e15a5d112969d72fd9. 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/MX4971508275.