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 0xb5f0c5e488e6f98f74531ffd8dff96ca07a3d68cccf87925ff5a8760f85a8793. 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/c108ff59-d20b-4887-af8d-40b749c4c48a.json and https://artists.proofprofile.net/proofs/artist/c108ff59-d20b-4887-af8d-40b749c4c48a.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 0xc049f16077db308fb9f873d9e0d7ba3889a33b1294306189d54ee2e2397840d7. 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/ATEK02355851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26a654a2c425d74a4fb09a495baf2314ce48fa6c23a889d8557d6fcf6194a147. 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/GX5MY2388173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bbce8c4d460a73584353070b760e85c5b6cea5f5baa6c49c9064f4d8ae55bb. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/GX5MY2358338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa22bc4d7429505d41951029d3aac7c1d71254b0da644b2f2365659f23959e920. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/ATEK02355879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35cb9c060d04eb8f73599716038f4b77b059e986adff71941ef5c6ad6003685e. 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/GXBDS2335816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5611eba46d60a0f116f8bbd0ba19b92aa2293c95e2de34d0970109fbfb9f056b. 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/ATEK02356000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4f32981c5f78fdc5d425cd9541ff390ea1c09bce49ec5260055018c16eb613. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZTV32354792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7a254a33a7c296afce078de24e5ed22a7e543a502de21ef2c0cdabbda9142c. 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/QZTV32366464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195ecb946861faa13782629699a61ee364fa91cb46a00da015690a33622e6077. 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/DGA052348213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193e4316202e9df08f3930bd033c11740c5f02da7c4b6b3434de3e646bcf2488. 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/GX8LD2312434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1a965a4204db3416cf9e956738768e48a3ee5e4fd70ea9f3a5481f9294ac52f. 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/UKZGC2402132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab30b3f8c6f019f18cc655f6b7542ed0f4a38e8e2fc91167b7e86a2af553ba6a. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/CAQOI2403861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1832cfe8d93dd1680a9872f7f859b091449a5fcbe79af5bde6a1e870c0d9df9d. 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/QZWV32432244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf931c8c3092271380806c6604cfb50778238fe20e87e130f24cefc7c60a51845. 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/QZZEB2416621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53aa9bc0ff820a69467616f26507f5576c70b2523bee278044e722e2577c3ca9. 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/GBKQU2455159.