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 0xc70a719f1462c0598982d44a308e9297d81e6fd15434b165a044230d12d58ec5. 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/2dbb5cbe-841b-44d1-a044-944da31bc035.json and https://artists.proofprofile.net/proofs/artist/2dbb5cbe-841b-44d1-a044-944da31bc035.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 0x75c486d293d4c48313db236ae5ac8269d5ce620aaf14d3221fdde215429b2e20. 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/QZNJY2375667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ae83ae75d31f8394061e4541658bfdc1847ca92a3f847d253fe11024c628c6d. 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/QZNJZ2300963.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674a4e26d273c096cc913e96f91c28147614417e6dd87955ac7d5b7db84d9e14. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZNJZ2391787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3cfd344df5e1e342476a9c9378a60aec5cd70071e52fc8a5d18f8843a8e2b8e. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZTVM2310730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3def825f30b4a5ccc1ffb095d4fe1e160de7237ed23ccef5e02df7d00baf6b. 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/QZW9L2350061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f7be4562f6e285528299e1f3329eae3eae87258c8fc86318e43b99ce308b46e. 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/QZW9L2384227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf314d858d9875f30e497250c9b93c34274248b1e8072a8dfe3d057c489f86b52. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZGLS2436909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9042b391c2405baa1f0f5dc35057dae128d470abe3c6aa669f4910e442524b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZNJZ2436593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95e29ed73a3590e7f051ef1055a57c8fcdd0a33cc7fa9f4760deedf65617a524. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZNJZ2436594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fcda21f48a7f2f6033ce9aa8a504eacb7adfe0ecb19b3846a297962af99614. Chain 2 (Bitcoin): anchored in block 957868 (2026-07-13T14:56:55Z), 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/QZW9L2453923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x541b0f3cacc341caf111b8653ab5bf92e65dddc36cfe94765252f954f71ffe58. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/US7VG2545201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x284391dd900fa0c5c248240f86dbe03336e39cbd75e02921bfd1d51fa6db0c66. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T16:58:47Z), 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/US7VG2555533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a8397c8f3711d24be807caf3a3c9448a749727cfa792a87c9621c0fb9029a34. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZGLM2552901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57a29dcd41c69182049dcf4cb3ac85a68a2d6f8bcac693300407ddf704f80ae0. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZGLS2571775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98c11fceef9b42d3a3596f5b076f92f3cccfd9f29fb1f412ae680453e31f6b32. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZNJW2525079.