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 0xe729a1b4b3a94fee7250808210ee8a0266094da690465f8acd6b4625f1f34360. 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/71d81e2a-e4b2-4373-998e-311873e72c5b.json and https://artists.proofprofile.net/proofs/artist/71d81e2a-e4b2-4373-998e-311873e72c5b.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 0xbbd3a40a29e69aa406c8b1cd5fb141a7b668871eabb2acdbc27b54935eae2dc8. 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/CA2EE1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ff9e16408f0d0e4e781ffc0a6174c633c9bc6370b97c3aee65eca98087d7da. 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/CA2EE1800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4b9ce1a3f3914814d143581d8b5714d74a7f0a3d9574b313b037b2d493e080b. 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/CA2EE1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe476d742320d911e41510c0c96ac7f0c3a0e1841c0aa12a264f7d3afd58dade9. 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/CA2EE1800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9c46ed422d50d87d7076a67bf432f37773a6f98ee0625841e8a9a722d8b122d. 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/CA2EE1800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ce42be6ec509a19c9d3ebef3e96bbade5400c385d02f117e918f6349184587. 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/CA2EE1800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda15d6e49e5ae3357184d5993df95e62b8f653a83cc895009223317f1bd4d271. 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/CA2EE1800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59907016d261e732c650e3a38ba2fee5d1a651c70ff0558c32a40b51aa7a6f24. 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/CA2EE1800019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746bc7e505d5ed6e55c05c50d3c95b104ab081fd0e9823b4546f0ce6e0c08b2f. 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/CA2EE1800020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7d4e933cc1117f0c3a3a69496327290cf66c9e2c246fb0a2f7d23f53e33e0e0. 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/CA2EE1800021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db18dcaa788b382ad7520af1136675f7ea3a0f7348225153d11cb8bb3398d86. 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/CA2EE1800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x310f81befaa5ef81c9e4c1e4d15961b56dd0d9aa27141247aedd749c03cb6cca. 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/CA2EE1800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbd3a40a29e69aa406c8b1cd5fb141a7b668871eabb2acdbc27b54935eae2dc8. 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/CA2EE1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ff9e16408f0d0e4e781ffc0a6174c633c9bc6370b97c3aee65eca98087d7da. 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/CA2EE1800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c1b4b0229eb730a0ef7734d314f0532fc497819c2c5aeb0e0500d3ddeaff0bc. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/CA2EE1900084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc24b76e25483dca11168b91526448226c292895710d9052aec35e097fc02cfb. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/CA2EE2000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d557f16ca0c95fd32ac27f577a3a39d788818494fc71b4dfc86323bb1b9cfb. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CA2EE2000104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaca47fa51eb73319cb6b8cdf43ccb68f1da9db012ab43428eec2f162b48620c. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/CA2EE2000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19f11c84735f80864bc329fa31244cfa311c5ff56e41421de26b859a1bcd6f61. Chain 2 (Bitcoin): anchored in block 956440 (2026-07-03T04:03:57Z), 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/CA2EE2000107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c37b49389a339cdb643b88c3113cf78b56fdc497c61084aa16d8905b07393cc. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:00:49Z), 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/CA2EE2000111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x186fbf68f4449fc56d6556d88ae5c022cb621711f9877c3ec527a8df4dfd7ada. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CA2EE2212101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32499d6e8fb9c722eb18a236e440d303404daf6d44e72cbc2e97c27a7eeaaab. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/CA2EE2412001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ed6ea65846b3d84f15e07510cd5dbb43a9c0aacf8a5cd713cadff47ea0b025. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:48:39Z), 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/CA2EE2412004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5198ec09645e897a62796b96e85885fae24ba195a310f3ad147c60f3f955c2a4. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T23:46:28Z), 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/CA2EE2412005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31aecd60f42d5e2f9348eb4c7412a4db93e3bbf7e9680c8bb3cd4a6d3a383c33. 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/CA2EE2412006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64de194e96ae553d6d9d74ba1caf123eda772c3eb9a87d5b3a0176bd65d96b6c. 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/CA2EE2412007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7257c250fce04dbdb0a291b84fedd2b343f7d103335cffc0ecae47bc35d135. Chain 2 (Bitcoin): anchored in block 957863 (2026-07-13T14:41:15Z), 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/CA2EE2312101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a57adb8015172f0906621f2917798ef520d868d68513eecae06185ece90857. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:19:17Z), 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/CA2EE2502002.