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 0x4ec10f1700c2d6fe0ea5c7aa35a786b0b5661ad47007812a7526745b82264903. 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/abbe44bc-d39d-4351-9a63-731f5785046b.json and https://artists.proofprofile.net/proofs/artist/abbe44bc-d39d-4351-9a63-731f5785046b.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 0xad91786593028754d7d3485d9f85d243e42f37fbb198547103c03de6ddb1b599. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/USANG2255251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae1da956a278b9cbc22c488bb040a6ba8ba0d2fb40777be6e0c4c7d2f7fb05bf. 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/US3DF2287681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b7ce37aa6b94e3e56c49bbebc0f661d65eeb0815be71f7cac2a47951289666. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/USANG2270772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cac87e8fd229199174240dc80072ab82907c96627987d67629e9037337f601f. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/USANG2266557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f992c1a3176d04cb50468e2922dc8b4828a4c27ce314512998070d0a50634d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZDQH2391324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce331922ca12fbc3055900356adf3abc9aa781078830a5a0f6885d27d9799064. 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/QZDQH2390788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb58c7fa8ed9e7d5562f04f1acde036ce8dd22b7b7f6c6de3a23fb26171ca3a9d. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QM3DF2203293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x075f9f219375dca50af18bf506fa5a6d54a16ec1fc0d330861889767c5d2e643. 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/QM3DF2203294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af643ca40b55ca0e2aafe937f2d19f5f67d251ff087cf13a482a648b7fee8ba. 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/QM3DF2206680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd742af93caee7c26f93f3b784215dab91e1e70805fee8bfb086a1eb896679f6c. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/QM3DF2206735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97483480d8d33c09654611c58b18ec0e940b4f551476c684052e19ec2fe4b866. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QM3DF2207187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227a7be2b0c2bff3e23027c2e159e1854220fe27b5b33c1ca2e5a79dd9065677. 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/QZDQH2441489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e7812a87197f561e527ce62caa1e0665539f35a33dd5c5e5b120f2b38f1da5. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USANG2453694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd0b13f7c75c64505e910693345a87fa4ec6ed46d74286ef32f01c52443f0410. Chain 2 (Bitcoin): anchored in block 957055 (2026-07-07T15:12:44Z), 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/QZDQH2429758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bff0ace7636d136a610a1f75fddfdc6ad5cc8dd48ed3d348b7b35c06baa6be0. Chain 2 (Bitcoin): anchored in block 960157 (2026-07-29T22:12:10Z), 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/QZQMB2107200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6698f30880a22854019b17e8f14958ed36d0bf976f1940e097f65f3fa436633a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/US3DF2416091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x738dbc4bb26c756927a65ce23f914c1be787ad83ec0627ccce9d6ed4b0d179cc. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZDQH2399636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4cb0aa8e11f3e8a89953c741c6966ee6ba22436cbab87c1c3e9c3271f27f298. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QM3DF2290249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18425a2a4a479d3527de0754cece64cb59bd4c7d93e63d755053f78b03d5fe5d. 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/USANG2273886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd31b4ed46b8d6042c840f83c7f686850dcbb9857c3332a395f26c648187c22. 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/QZDQH2258377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9692a740f7ad510a4215bd4c1ae876be21972e794e8dc2f1cd2a3e7f1b17e842. 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/QZDQH2255294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03c6a76c75710ff72bacd10f15ccc721d61a6db7acb3cc215510787ef5104cf6. 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/QZDQH2147024.