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 0x1796226b125d7d4243c3b1c2d6aa5338b5e3f8dda2fba2e462e4442f681f39dd. 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/443fb3dd-b9a9-47cf-ad73-d2dd178077e0.json and https://artists.proofprofile.net/proofs/artist/443fb3dd-b9a9-47cf-ad73-d2dd178077e0.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 0x53d9698ea9ccaca46cf82da50565808941ad1ab4ffef3690ac94772d62c213df. 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/CAA0Q1112402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea288e77176f6cc9455adfdc499aeadafd0d64c90f506893890ae3620d86103. 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/CAA0Q1112403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2182e361788b2e836ff3aaee5da837562a1f99704a4740fe6662cc9bf9d9179f. 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/CAA0Q1112404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cb25ae677f5fc99d045f7b19cdcd67cb33de1bb98a9a318fe01b7838f4568a. 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/CAA0Q1112406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x398f8130fa361be8ae3be96561c3660817a8c5d8ef2a2e63d8b87f92d87feae4. 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/CAA0Q1112408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b18e9fb5edc62db90f6babdfa87e69c73c56f96e7bc7b160ebc9d6272abff2c. 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/CAA0Q1112409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8407eeb85877509b20105e796b1d9fe304d6220ffa4d05b52b8746ebdf05e95d. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CAA0Q1112410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c9e75c118d660725d5966926932326dc4823f313b76a91725cc3243a1e7d0b. 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/CAA0Q1112412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c370245bb9b37595c25e483e500894d833da5dc07e954dd63ba323f88522333. 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/CAA0Q1312102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c781ee7ea6be9ce9ad8c3188feafa4212df9dff73b2d97a2c3c9f50d3dcb98f. 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/CAA0Q1312104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c674adadb5f31e2eb53ca980d89a8c892ca89375baa5b244479ddff365ed8f8. 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/CAA0Q1312105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53656269930165f672d4c0d8f140af782fd4967614b3da0f0268e1cb775c54a4. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/CAA0Q1312108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x226feba91a92a866cd3547151d687b0ad5dd043a2869c9c07ede8ca9429346a9. 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/CAA0Q1312118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeafab040f1be6451fd7a5242115ac53518b230eb6078a1a7e8d3bf7d98b3043e. 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/CAA0Q1312119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb451012025991bb1cf51b7a801af8c06c8d5768789c1b4ee0c00d861588999c5. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/CAA0Q1514001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe416711e0a805c4cc86130b48f12befa9ecb4992720f33742b9161d968defff. 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/CAA0Q1514002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0941fcaf596c98cc84104fd44f0bd7a23ca92845c6edd361c363e492cf54199f. 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/CAA0Q1514003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16eb915a6185e9f6b0a7b64d53fd462f352db2df4a442d3835dacf5d6ea07aff. 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/CAA0Q1514005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945a3c43f97a90204ff9b4f090db46aa6f8cf753a19cdb0b940679bc57199cf2. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CAA0Q1514007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235d4ac4cdd0967bb3031788be00ef886079ef818839140e1b34d5934254088c. 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/CAA0Q1514010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93435bb31e3c7a0c62dc02f435558245746f8537e0712d65494cbf712642afc9. 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/CAA0Q1514013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01f8c32af867c7b871f6310ea3b468f3440a8dc1da3a7218a47c43df8213eadf. 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/CAA0Q1514014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3fcf34bcde1f8aad04cc789ba3bde355d5938c8af778b2a8960f065e6af19d0. 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/CAA0Q1514015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76816b7be2b60e3364dbd2ca923fc249121c4146eea9ef8cd532228128e9a5c. 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/CAA0Q1412303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35a1aaafc0e76bd814673d8bdcf8c10b9327de022f70f31b34d17a46967f35fa. 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/CAA0Q1112505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbef74494c7fc8714922b9e6386b398a2fc75459ee08cb544e4cb22c663f73b04. 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/CAA0Q1412314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6db18afeeeff043618f14a1f5cfa02090bee815206686e6d0e02933d80274f9. 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/CAA0Q1212510.