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 0x23d46936128c7e9d6dff041976e8d3ed6d1045191b6c3c300f9e7eed7c01ece4. 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/6eec8c32-17f7-40c9-865b-a8a50035a3fc.json and https://artists.proofprofile.net/proofs/artist/6eec8c32-17f7-40c9-865b-a8a50035a3fc.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 0x63d2b1bbf654f7123c5b3b4fb2dbe685b9ebc910ce58c86f5a0743ca142d47d1. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/USCGH1306586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe648d33f8600ae62e78bfff0e408969536c8c290d4a55b9157c016777c6d88d5. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/USCGH1306588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4134b5d9599960fdf8325b62056f93126e16b3a1f0a2a9efe14f67c208eeda. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/USCGH1306589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67d443a2100c69ea7c3f5a7fcffd4ee5d7415f97ca934eb2d2ec3271a0f4c973. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/USCGH1306590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4fc01a5a4fbd8019296d57d584716740ec77b55a867111c9ccda215cf846ce. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/USCGH1306591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20cdb325f167c230f173cbf649031d43b89de1c7d39c989a50c10c31cc681818. 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/AUV241300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d233b90eda80a1e32c085d58c4569a9a2f62c2fe3dc10177132cc9dc2d3fecf. 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/USHM81867828.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x705095de0223121bc82a6d3efaff7ee25c9c34a79d25c9b8a8e5fc136b8ef997. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USHM81867830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d18a7293ffe74473f30a54f45990e57aa7f7e3cf739c6721ee59e919f44d29d. 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/USHM81867832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842a1f0556ea49e3e11688a93dfb3918149dec46c3047ce2ecf7c7b596baa1b5. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USHM81867833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fde6bb0f57910fe1e0274018e71335c6130dec9c9e9d82fb60f9211e49ba11. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/USHM81867834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7cbf96d620d4ecec37721fc322688b8010e43889e7f2212845810c9fdd66a9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USHM81867837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c742f8124c6c0c2d6b592802ed94a4d0ad5c5a0e38a74fcd364a372a9b31f42. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USHM81867840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41c4768b28cedb40d583bf89a3f46b6e75e88fd62d0d605a3aae48528ee27382. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/USCGH2464137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c412c9d8ff3031ba5e4335b15bdbcd4c3a3575c25ef0e6b1105e3ecb29ea37. 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/USL4R2535405.