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 0xe4d9c8d52c13e1bc195b53c69c28f8cb6cce07e88ad73df15fb9188e2ff3e915. 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/fc93bc21-cfb8-4e3a-972d-f44d6c258f62.json and https://artists.proofprofile.net/proofs/artist/fc93bc21-cfb8-4e3a-972d-f44d6c258f62.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 0xf5a4a57efa68971a04657b25b0246eb161bdd2538e75dfcb458d53643d01ead5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BXIV82060922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585b15fba4f506280a75e4d0502ea6661325c3d18167d9e8f9fee897040a03f3. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:42:36Z), 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/BXIV82135785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24d3f17e2f3b43279be892c08e81555c72a3ef487802f65cd0c1202eeed69dfd. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/BXIV82183575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdabfbd31d3d54269173b358af631fcfab014bc9335be5a4bd1e1e5f5b2a4f78f. 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/BCPY02200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32833fc7c765d8fefec61af7eb3f709a93d3a922ca85c55bdd542b6bebbc7333. 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/USLZJ2382629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe1e024e8ad89b77695f3a7238cd098e6a55f99f6adf2714076cd3069554a0b4. 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/BCPY02300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42feab8d5b5234951aaeebb85c72531f2b43cf6c753c164384034d341d857ccc. 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/QZZEC2466263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x427acffa278b8ef5afabd9663ad605895bda78cf5ac1ce0a89b289bfcc06999f. 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/QZ5FN2510241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d9f0c87eb5acfdd292fd8939686432aabfac8ee4503886e3a61434975c58b9. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZZ8B2410499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcccbe089640017ebcfd58ab88bb61c0d953fb7b64fc8dd734ab56eba88b395b. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T13:41:08Z), 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/QZ5FN2510324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b943f82f474c828704e843080621c48698896087be9cbffc2385cfa961b9c0a. 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/BX5DA2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe168698fda9cc092ab4ce68aae48828c71c7408150d740c76733af4f977de748. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T08:11:40Z), 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/QZW9K2304720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc638e9378036ad3fab74575b660124ef1b9086002ac6450a3eca45fe8d97f7c0. 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/BCIOS2200015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fb248de83229d4fb46dd36b91cfed7958c8de628d91ee8105a2d5abe9584a37. 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/BCLVY2300093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6de70a3b0cdd07497a7921008f50680b40384d6ec82ed2201aa9dea4891c6d. 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/BCQ6P2300010.