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 0x4f63ae0299a265037eabeefa105148906bd9f871f5b6a8522419c096a49c52a3. 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/d58a21d8-1087-4e0f-8deb-da1884d2826a.json and https://artists.proofprofile.net/proofs/artist/d58a21d8-1087-4e0f-8deb-da1884d2826a.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 0xb9dfdd90c6519caf99f6969b22194989c292b7518d781abf4a1e9c7bba5bf63c. 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/DEUM71904785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6926591687f34f346b7357b1095b84ef282212d42964194cb5184df84c4ed3. 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/DEUM71904784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ed410ec23ededed9b2e1a24cc7fb01b22ea0f4cea3a310d9e30ca1e927d060. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/DEUM71904787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfcae7fd93a5933983b049ce7066114c05883da9382811a7afd4698a26c77b5. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/DEUM71904789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0edc60d1a3c86dc84915ec260ebe2697894f859142dd58fe7f138068aa4ff7ee. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/DEUM71904790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ea40388de24d3713fcb6b230a8e2fdb8785aa84ebb811959ad0abce23ab9b7. 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/DEUM71904791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba176fd28ae370d7ee217c8eb0f54f149c8f5366b8e89e35907c23223aa7411. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/DEUM71904793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab5b354e6325150e32ed2886617e5037b435b287bc219b443720b049a02dea7. 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/DEUM71904794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a36a62ca415cc6e0b11ede5ae48236a20d3b805291c57876b77841f7233ab8. Chain 2 (Bitcoin): anchored in block 958656 (2026-07-19T04:04:08Z), 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/DEUM71904795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7567930c862245979a83290248cfd26635cf9cc67c5a9a47da8b986766664c71. 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/DEUM72302149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7567930c862245979a83290248cfd26635cf9cc67c5a9a47da8b986766664c71. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DEUM72302149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4a2446a69028ca10203d4c9b4ccb246845fb7eeb5e7f2f5cbccc072d077be9e. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/DEUM72302150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55319168f80dfd8355b075c8e2d7edef1a643d503972564e16518cc43acc2813. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/DEUM72302151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf85dc582af915606b18de02f1e7cc7e0b67d7012a7b9b788a7866db6d3c4430. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEUM72302152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4710217d9a5e9da57dc12bdccd6413bf6f35894ede23e008bd9db1d44bb48a. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/DEUM72302155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb42a969fdcf5aebb5a0846ac60666dd85c050c4b84002b1be2c2ab5e47432d47. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/DEUM72302159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e1ce9dcaa57b2f2e196a16445cbc39379947536f4c49173b4a1dfa0c584a60. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEGQ12000301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e1ce9dcaa57b2f2e196a16445cbc39379947536f4c49173b4a1dfa0c584a60. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DEGQ12000301.