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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 0x96b04b61c452d0cb0adce231898caabbdf26d688fa94c854b19fd3c26ffea1fd. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1f007a6d-9d7c-486e-b46d-81f9dbd384b1.json and https://artists.proofprofile.net/proofs/artist/1f007a6d-9d7c-486e-b46d-81f9dbd384b1.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 0xa06a9e2c56e42050b95099fc161024af13c9561796e3bdcbadf2f88dff7dc05d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USA370664812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x383c6e1cff84524c8252a1b8ff5b6a26e3943a1fdf58a8b2ff5ae1828fc2c389. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/USA370664813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ce915fd9eb717000237fdc0a340683c40e9d7afe123fa20c9619bb8b084a9a1. 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/USA370664814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59b9dfe8be5af8c545ecd116eefd35c5f3e9ccf449099861ad714d0ef49d08b2. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/USA370664815.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceb7faf3996c07be34c8517ac4adcfe4c17226c07c40f7104ca45aec87c0a2ec. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/USA370664816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1120b982f4c0ddef26528571692bfc90d7a9e4e406bddee6ed646075cd9c15. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/USA370664817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048dd36f37db28049c5a26ee4536c7b302818dca6c0897c5e052d1392497efe2. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/USA370664818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c7aa667012b38348c93a3e3ca16090a9249ade5bea266fed0b7c2b2c50df88. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/USA370664819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329501d1b46446eb8e8e82a6c3e898b99950dfd83451679a3015bbf7a7a7b71a. 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/USA370664821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68ad95470ba1345e7855d20f3cf9ccd02753fb54789f76cf7c3533faf04dcd1. 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/USA370664822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7ca843323d2d6070343691bdafe58f2b2cf13cbaeb80f41504868b061c1bc2. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USA370664824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9d7e5c878bfe2c808514ef228742dfc7baf4f39ede2ff78512fc9b5a5871d4. Chain 2 (Bitcoin): anchored in block 957876 (2026-07-13T16:00:32Z), 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/USGQU0700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ea7899d808564f5f9db422f2993dcc083df940c3f4eb5f1896c54c5ec8088b. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/USGQU0700116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3584ecf80413d6d24860ee1e2ea00b77518ac3f6af90fdb328e7e13923034291. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QMFME1426326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7125becc7b0bdd5c1eb08f4c6a758922f705f1ec3ab3c5cfa5a28026130f49fb. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/USLD91724000.