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 0x1d59cdc21cfaf2e5da4b3bf50d0caf751f923ec8ac33f900fc33c99c0e9a912a. 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/a576e181-abc4-4de7-bff7-4063ed0d17a3.json and https://artists.proofprofile.net/proofs/artist/a576e181-abc4-4de7-bff7-4063ed0d17a3.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 0x136844475794c214c62bbb9f623e8b4b870773de1fc62694ff05f2193ccdd974. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHN32352236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84e63911d86c8b5ea2f8a33daed3bb0bfdb17147cda3401a6ee4b9a172a9617. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZHN32352237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432955dbfa67db36c3ddc4b5216c18cfa4439fb120ea73925b1cb018627dca0d. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZHN32352239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c60e61b1376bc8c881184c89a5bd921f5e60291c36c92ee01567681a0bf847. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USUYG1738487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4718c6e63f3154a28fffad0ed0f879aa4fecc28f6a2b7005ea03d4fa297182. 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/USUYG1738488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f916c5792d98616269a7e27afb818934066ad6d43f1de0f96c4f50bfed3cab6. 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/USUYG1738489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46b025dc83b66b43315427df76fd4c3df439ac413933524a9e98b12d381db08c. 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/USUYG1738490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c0cd43d17ca0427757c4d45728ecafd1453f378bda62ecea739661c92a40d1d. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/USUYG1738491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ed577a1d6f1a339ade736390ea5495dccbdf8fd5095ca6278fc92df955af38. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/USUYG1738492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ee4decf686e05e46c744a5d6bf2b92149ff52b2930f713e00abd7d440f0225d. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/USUYG1738494.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67489da1b3e7353b3b1bd2acd7795e29598c32e2397d564f282354aa80099e7e. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/USUYG1738495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0370b5cf5828dbb6b4c337fe329570559bfa8bd0c8f27d4313babc388895a829. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QT3EZ2416665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99932c99533bdd9226018e1118d27b7bf67d511cb6e8f81691fa8060e19bf30. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/QT3EZ2418900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb971e545d37b45ac8f922a7f7cd36bfc53a1811d4772bc0fa57cc6c6be5d340b. 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/QZFZ22517473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263573f3e85ebe9b610deb2a06a25b81dd5f041759778e71b51f781616939bd4. 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/QZFZ22517474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0370b5cf5828dbb6b4c337fe329570559bfa8bd0c8f27d4313babc388895a829. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QT3EZ2416665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaf1165b05cad2187cd22a06d28b47cf0a8c31b530b699bff95f28ec267e378c. 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/QZFZ22517475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeb8c4ad95c8ad13ffb7dfd656b8588dfc0959e179d11b92699dbfbb25cb9d17. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZFZ22517476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62251cb742f6205f7192637107ea899d7454cddc7b68f349aaedd394a67447c3. 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/QZFZ22517477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7728c36b435bd0c6d27177778eb5671504c31166ae66f3acc85c7c5af1ce910b. 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/QZFZ22517478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0284f58ea036ffc468619951c2c033f7497a539a21ea1e235ea1bb9f34883496. 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/QZFZ22517479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58870b86786d6371c017c72df385a0bed195689c5431c94634b5f05d6b6a1340. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QZFZ22517480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49bfd533c83289bfd2b3ca7a9c8c937b5eeb7064ab20ac2b29cda2d7421a5278. 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/QZFZ22517481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99932c99533bdd9226018e1118d27b7bf67d511cb6e8f81691fa8060e19bf30. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QT3EZ2418900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccbdc466cf776ab206ea9368b1adfa16799339e171276887aceb96ce258cdafc. 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/QZFZ22517482.