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 0x2915cd4e9cc408210e8d6d8d53cda557318381f833d6b07223ebea489cf338f9. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c50045f9-9173-435c-adf8-2681e4b8d7f8.json and https://artists.proofprofile.net/proofs/artist/c50045f9-9173-435c-adf8-2681e4b8d7f8.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 0x236df597f1d6f8ca26807f0098866f10bbfb6b6720506af6489ef386dab413e8. 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/TCJPL2047195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11152bf526206bc26e5c815b8bac408e70c1514dae4f413448ba3b8dfb3a57c5. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/TCJPL2047197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427b60ab5482e034403cb2e3f65b61e8c0e8f104b68019037d05afc3f66eec9b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPL2047203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2d0e15dcedf043c8fda109eeb02005bb1a0d9bda57e79bb3802b823c9f2ebee. 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/TCJPA2494327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36be65c1f60140c09729b1de773ba4dc45ff879654e73239a19f192edd68f56d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCJPX2357453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a3fb0c3ea90f7012724834d4524021e99c71e63bd03930128235c36948b15b. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/TCJPX2355484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffc02abba2c50d7bb2f38ec991c127c05db193520fd9201b6d83098fa57bf597. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/TCJPX2335524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd70c926b24d1159aaff531baf82d7f84101acd27c673d9a174b57bd731c90a5e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TCJPX2327838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376cf810235a1ffd7412bcb6e3c078ed4829e9183c963305f158994bfb5914b8. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/TCJPX2312270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52a7f0c11806c860799307163ee4b3456b6b765d3a2e02a60f53cc6fd9969371. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/TCJPT2203087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeeca1e49a455bc46b1fb45899651fe31dbb4077f9333f9a092c9c7a0f69cd5b. 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/TCJPR2271392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94c9b6df93bb754b55928af084a6278eed8d4cd1e31024cb73f74d49eb45d1f1. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPP2190818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa50312d9d754dc9999ba33ffdbb359d81ede70d935560cf84ea4459390e3c4d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPP2170918.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dec96eb98333cbeb44553aa2d1f2f7a09e18f4ee60aaebaf3d41c6f7a953213. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPP2130562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c023450fca421bcbf5ff6a8b06cb4c99ea78072a49eb408d624cc8d54a05351. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/TCJPP2106047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf015a6c5c913e4ce838daf759685c341670c28f7156827df334e1fb46ec0524f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/TCJPO2116693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93248d2499f37187d51ff099436447a88f438bdc24b70103cedb3e190082a7e0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/TCJPN2052138.