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 0x94e73b87cc5d2ee70487d7e853121666dacabed6cf52e0459f493d1e5852ff65. 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/8dcab696-024a-4ea9-a3e6-d9de781523b7.json and https://artists.proofprofile.net/proofs/artist/8dcab696-024a-4ea9-a3e6-d9de781523b7.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 0xebcb2fdc3079c2303a114cdbc42408afced7e51dbd408308a4412f9679353490. 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/QZDQH2262348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272a474103c123a05889f8fdd312365669380643a0329777784c071578570ec3. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZDQH2268785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25518e408e875719587ea11f4502b4a507d943e6aaf988f5f86d07c67968f4e7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA82348889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f021130f8c755de83cd233116f0eba6c27e74fc8e415b0000e80435140567e. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/QZMEQ2322704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c85b6936cddc745bc65f8199139e90c55b3dc4b8ba9d7c727e44cf5e3c747b5. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZMEN2399072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca1624743b9ec95ec4c3b73e9f02835b9acf4f2bf1af4dc240cc6b05e10b03e. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZWFL2300805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520bd27bb97a4e1f861c0790fc4b86c6b7b2f5e392e3089b4df37d26e49c0df8. 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/QZFYX2450192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665b2d1fa9485091d4961ef1ec9ddfc83eb3fbd1adcb90a6bb5e23e5dd96e653. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZFYX2450198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe127d53f943b783f2abf92b09464c57105e3361931865a7e7bc3e865ad1c9134. 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/QZFYX2450200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c28c82c2b0398e1077de2cd4a17d4c108c121bc7650661588cb84ef521b294. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZES62459411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x093c6ba4cc6400dc913102fc3d90d429feefc98f7050ca45f6ba2a233adb6dd5. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZES52420516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ebf6cf48e639695dc05574133c6c4a5ae108abfeb6a9c718cc3028fc15cc1a. 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/QZES52420517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ab603435381a08b91be8d75d367d3b9aac86000b93f18e569c9faa22ba7391d. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QZES52420518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc91fce70e8da8d2bc9336ed9d6f7c46c6cc409321027dc13ef0cb70de06234. 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/QZES52420519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x197c02ab3e68b1d9500fc60635eadf04f3d482c98aea274a8fe5231edb7d7222. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/QZES52420520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fbbbcc06615a37e9734db0e0754c0d37a255b146d9391311db6ac9e0585ffc7. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZNWU2429999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50dea5d12cf7fb550054eec8b7502b1a4ccbf983715f118661af6416c1c31a0f. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTBF2480965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54aaeee579e731e17005e9e9299c115016993117c59d82ada3a19582d8e574c2. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZWFF2467235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45da1ffc1598b4c1a20e6bc91ae721711c3194cbcce31138b50e4f0bfeffa69a. 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/QZWFQ2476513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82a07c14e544cdff16519fb07a94813b7218e4c2ad1b56507b72d096fa45897c. 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/QZDQH2391766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb83a31c663ce51f23a302790a8f4f26a0e22b69b62bf043f6a23c419f2b55190. 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/QZDQH2260202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f7cb465d2a4ee4767376bc960cfbb047698d59dd96b72a9666ab6c02dda4d31. 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/USA2P2472927.