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 0xc8cd85e57a67d2b5b2d0ab8a883379481543902ed02e557ffd2dead267ce8775. 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/03657b1f-72bb-438e-b90c-b13d0dd8dce5.json and https://artists.proofprofile.net/proofs/artist/03657b1f-72bb-438e-b90c-b13d0dd8dce5.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 0xdfcab3936b49113f8aa4f41425112010d5d3ba9392e478a9df4717d7ca11b9df. 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/USA2P2041556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa735ad7f5c8e7ccb7bb852ae66c1c4f1865fb79cfc9dbfc3bc5d5013b54af926. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/USA2P2041351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d869ee1999f7420da3c94813910d269d8deaa870faf483cfda012a3e0972f8f. 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/USA2P2029673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a43b3dd04b88db1952a1c8a08cf3b44e07c70fc266e50f2869d3b25f9708480. 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/USA2P2361147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecfd1f6f1d2113f459627362845f1d7a70ef5e4fee19e20019add3f8298abe6. 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/USA2P2358919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb718119dbe6ef04fdfa68d5caac81c8c7063d3d66fee1dc5e241b7b1adbf7ee8. 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/USA2P2223290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7047b6a69a3a9e7a7b1d3fe94b4dd855a8e00edd20863b0fcc9f30c622704f6. 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/USA2P2158085.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10977f6de04ad663fe924cd82254377486a6997f1f88122db13afe6f6170793. 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/USA2P2130202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4493dc8c38ba96018972c3557b420056fb19b9b9670bca06ea48da0533e80e. 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/USA2P2130192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86573d47d478c9ddeccb6c7a651f5c217da53a12b95043dccacaee54e403ae22. 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/USA2P2116965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc55b8523d71aa03b28b819a790aa3867f5dd88a84bb478fb8fa9e42cbdb13264. 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/USA2P2114437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11bd9ae8a711cd20161ce4edf8f8f7b4e780383d920bc5ad17b2141bd71c8978. 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/USA2P2102376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff862dec24b66f251e49133a2991fa2d3970d022a40788f3f6a377c2964f089e. 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/USA2P2046165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfcab3936b49113f8aa4f41425112010d5d3ba9392e478a9df4717d7ca11b9df. 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/USA2P2041556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc83cca06747e191d9192e4b1aabe38c9e7dbb38334ad0af4ac75ec3cc3247e. 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/USA2P2029681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d869ee1999f7420da3c94813910d269d8deaa870faf483cfda012a3e0972f8f. 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/USA2P2029673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd16eaf55c41d5964b8116f0f4639fc0d69232c370bb2afaf4c13c5dd6fc7144b. 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/USA2P2028167.