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 0x0a0b0d58a8fc3cd00113adfde921acf7e0b6ba84bd0d9601f25562edaadf781d. 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/09f62c7a-334f-4bd1-b65e-553fdcc36eaf.json and https://artists.proofprofile.net/proofs/artist/09f62c7a-334f-4bd1-b65e-553fdcc36eaf.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 0x3ccb76d82c55e6907e0db8d9df3ac4117a1460d3c49fb0a2ddbf166bc953ae51. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR1842939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e3a1ff005370b3f51a4fe8d4ee7fc82f2cb2b08589a6ba3b5d5e763b54ab945. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR2472655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb318424a05e21515af738634d64489d241da3b6b40eebcf79a602054b24a9bac. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:54:07Z), 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/CA5KR2472663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3d9c393d07929072140cddaf0c6ff991af3a30938a04f2da4cb9ec9594a3cd3. 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/CA5KR2261214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fc4ddb889283dee2cb652067b3743aaf91385edbf4ff93141d39abc0e50a0f6. 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/CA5KR2133653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d777a69d4e1507756d4e53bcc243ea19eeaf23ea26d1713e486b354e7c68d9. 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/CA5KR2133655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe53cf4fb10efd318957caef66720c26d1671978471170cf80af75b4ecd1d9e03. 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/CA5KR2072976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c54f72c84e0e538058c8ecfbc2da9e5d22a301315eaefaa9d5c8b0f08480d6. 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/CA5KR2072985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79f4eb662fc68347b0326281649e10c36d35b08810ab27588ced192126fb7594. 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/CA5KR2072987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0b1b3ee03208f43b08b182063b7b10f0b50ba0ed494947a6267492cfd51516b. 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/CA5KR2072996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x573bca7c9ea57f4c3219aa8748c9f487c49c7216e0c64feca7fbb221e8c8656d. 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/CA5KR2004687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f664b96eee1b65dda47db07f0fe14f314e0f4665c90649a3ae5b63a6ab47704. 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/CA5KR1939728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645896fc85f42364ec6071b8777e8cd56642c7669bfbc75a4a44aa98a14d95ae. 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/CA5KR2389571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x946208c943609d38c31680fcceaf884a4cbd96eae6868b335c15ee9cc88e5018. 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/QZVEM2323056.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x562840d4904bb26f7a79247e73027197c67f2d3789bdd75efac98b16985d5f5b. 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/QZTGW2100842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8815c2dcf259c68faa9b7b9a0d22e641f09e6829a1ed66c4bb7a966755b0cea7. 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/QZTGW2100843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fdec296dc12b3ed1d3f89e8c5308beaf84018ec046c89da261448ec75b36f0. 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/QZTGW2100844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd363e51678ff888e6b412b4e85ecd6ae0c8163f62b44257b3c4c0c2c31a42f1a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:45:24Z), 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/QZTBB2325940.