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 0x456f8eddb67448a7c1f8f1e51ef98e7891de730c3f404e46dfd873135c03b72b. 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/31278ecf-26e7-4f49-8c71-34ef3054af85.json and https://artists.proofprofile.net/proofs/artist/31278ecf-26e7-4f49-8c71-34ef3054af85.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 0x540ef10f9369a9db7aeb3f30899491af94984fed25852217e0f3d08191aec70f. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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/US3L61480321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf77c3852744bd403fa050d4f49f1d1544dbc1e89f606b757ccfc9e384f60ceb2. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/US3L61480330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e43da443376bef01e23d1b43e7f0d8840f5417008b73c91a4be88e731dbc89e. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:06:01Z), 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/US3L61479549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7628c6aab9dac7dbf5f843bb6900f900616f091d8612bb3e44f225d7a1334eb. Chain 2 (Bitcoin): anchored in block 957661 (2026-07-12T05:37:10Z), 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/US3L61479551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x999b2ff70d00d2e6c8f5ff69c29860dd67e15ca516301190c8a3857546b3ba1e. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/US3L61478711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1fb74e432674559c25bb069c800107e830e88a28fd316113225e11104f3376. 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/US3L61479688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b038be658daeed55c8ffba7654be77fae959b52ceb2050b85613b4492e6d4bd. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/US3L61479689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca48fccbe80d512ce12b815f0425edc3362331ae77a43fe0b55e7df72bfacf7. Chain 2 (Bitcoin): anchored in block 957653 (2026-07-12T04:35:02Z), 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/US3L61479694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b52916f95e982dbb0e9d6cc802eccabacf4a6af8a42d28fce06b39c8977dd04. 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/US3L61578459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83e910ce3936437e14c9b69f69e058aa275a7a929c811d231c389e04d102a1e9. 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/US6PD2500895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c41d5e71745aa4c2f3a92739905057b048f4ec85a67bb2509096b4e8c5fcc65. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/US6PD2500896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13be10ff8486c1f6c2b2a15a9c147692afa3ab8a3239052653f9a7c5c2e626c. 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/US6PD2500897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fba0bc9dc016b8b2697cea63c0c7845e1e49d6983b6e79bb62073c19e14d468. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:10:47Z), 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/US6PD2500899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a53efc643019d7322e2b8fc7a5d6c99a967a789be6025413ae81bf1286ae550. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:52:02Z), 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/US6PD2500843.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe976f56f67299d8150a3bd1d928801963c4cd7d469c8b49a1d7e215f2e0b1544. 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/USCJA0601164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34fae93a4e0d6f4f49ac5178269ea8cdc1248368906f677858771bd108ae58e1. 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/USCJA0611343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6caffbb93bddad7dbd6b2d2ac8da8eb9c523c09eb55502f710773da0b2fb9f5a. 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/USCJA0611345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc2df96da73a879e9ee7f36a8593c3fb4db4352cb758bd2a5b5043060b7e082. 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/USCJA0611063.