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 0x06c80d5511a9da8425ff3bd4a44548844acbeff78b94b4c582e9e30a67b27eda. 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/f874b1d2-a3be-4ae9-b348-335b7872b8e8.json and https://artists.proofprofile.net/proofs/artist/f874b1d2-a3be-4ae9-b348-335b7872b8e8.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 0x0838a1cfdc6bb826eedbed78b8ff98eabfebe5d62cdc95aaa65b63cbfca509fe. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZS672263295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf63355e0e21201ce2d9f363d675fe73f8cc6c139e15373f2f976bf1ec8990091. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZS652296880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc8099af42b6df9a8d0df3d5fed17edf2858460a81575b31ef938de75088eb0. 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/QZS662258431.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6f23a9b87b6c587400d4f19d33c04ae966259aa70a5f352c88e0a6609608f0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZS672211026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9887566691b9546bbe34fe349c0971011ae33cb56badc3affc409a4abfffc03. 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/QZS632273931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffba0210ae27760b14201d54cc7307e1a851ea6f2bad23cc48961aba2efa604. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZMHK2289700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd39a598f157681a914ef9b08bfdd1f33ab079b393421f27d6e70a9972595d7f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZS632232839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8530ec4bdc9d7bc23114bb4e464008cab85879b80e47d02229ab6a54e6b15f2c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZS642236361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x102e8a25470121af207726f655a75f542bfdea80526e86548c4be5623124199e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZMHM2248747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7f006d4de8333c96d7f255ba313f0d76b9303058fb6d6b26e81494dea99850. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZMHL2283349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc61da340d52c91ea2603906193625b3ea91714c034744875db5d2e6a94ca6425. 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/QZMHN2212865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ed59b30584d3a5fc988bfaf54a102a9d333927e958f445944e0806b4f15982. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZS652227011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dcb113ccc207e9eff9bf9f04e575d35dfbe23da9db94f1c3d91a27cdd2eb660. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMHN2246189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44728dff55efd056421b984412a41f225be8f4bc6cf2a8eaff7d4a9d5eb630a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZS652215329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3efdfa4144ffd3323bf51b4c3f62c5f81482b3905df34bda1159bff8476cdcc. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZMHK2283512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd7905a140697471ee56b0a7dbc4a9778d0c1eb0cf7b9331242a82a6963724f2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMHN2265562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9b478f842c2215aec3304f53a8da79e34a92e622e5ac1a2b2b40a88878c3fa. 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/QZS672275688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1e886ec6eac9ca1a5ae8774b197e7036d5a414c49652947b4f35fb2168e76e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZS642265372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c93885a664447674e5235f56a14fa464c55965563ed0507eea910b3936d46f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZS642237355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d5f2555bad980b0a3955f6e04b3259c02cdac547f95ec84033105ba7fc8c88a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZMHN2275886.