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 0x506b34dc09044ed8b54a71b84cb19e2b91c099e1315374dc335a37f05bf80f8f. 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/5f1803c1-f931-4c37-a13c-f4c6eefaa4ab.json and https://artists.proofprofile.net/proofs/artist/5f1803c1-f931-4c37-a13c-f4c6eefaa4ab.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x8cb3c3ae50ba3eb2712976bac01ec3dbb7f28ba371400411d5da3467dd509386. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USJ3V1198072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97893b93ca1a905df6bd0ab56688386361368b96b4339ef60271dcab051f73fe. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QM9SX2204929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6712a5030856414d906709ed280ccf2096886c1915f480094394760115b7249f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USJ3V1141646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ea64d4c4493a2027a743b7f0f3cc71a597b5089ba3d05bee18dd28a24e0e81. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USJ3V1159135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f3b660a494892c14ba8d8aed486cebf58bbbb0d7bc07a5350c9c44bba512e8. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USJ3V1159139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808ebe3d7a444da2eb595027ac954dc470548de1771c2302210023ccefcd819a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USJ3V1141630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a09c6249fb834cbd47e7a22787cbdfa35fcec7fc3975b0d9ca3257d5710da1c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/USJ3V1141634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d020a281227f82326c131ff6027011498c46fed7bf24c0799f5e32f3b6c5abb. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USJ3V1141662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8910c83708990d2b204eef58cf7a10d4eceec01e995f63ffa3419d349e74d4f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/VNA2B2500997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x168cfc3c8c36f1d4f25471cd24d992f0517fce91d1df0d082f84fea553b2b9fc. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/VNA2B2501002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7277a1f780a1e3c0ff2437a791a26e6c7894ee8aaa11383774496a73f23973. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/VNA2B2501003.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422f02211d6f732a8bffd6f2473b766a04698de0a98c7be2264b8023ff60e894. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/VNA2B2501004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a94919f511a7e6fca18c558e2b09160d8aa0f1227749f3398121bd23e9fc6a. 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/QMBZ91916426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0284f6b6340048d9f0d2f21128d0786129a38540f7aee1540c925d28687049. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QM48F1656808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9fae686090e4b8dac9e2453a738aba32c082f6cb5ed2d8d41cf5fccfa173ab. 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/QMBZ91911762.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4096ab3990acbe02a2b18e5ce712a6a630944993458dcd26d8fe14344c17cedd. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QMBZ91913671.