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 0x2f010b89fe37171c50db9fabfb261a77342182d560449aad59e6643c4271e3a1. 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/ef963379-0cc7-4461-a603-bee6e9daed9b.json and https://artists.proofprofile.net/proofs/artist/ef963379-0cc7-4461-a603-bee6e9daed9b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x1360bee2654067076250b5a6d32a284dc545b6bc5fd9057bf37c41e8db30ee8e. 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/GBRKQ2254971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b39d9a53235d1e36329e61283f38325c1043a5405ca1e32d5e9a5211541725. 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/GBRKQ2254972.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928a55bae56cb0f4dad0481d1b5a0070094bb87885f062e607f8fb220986cb1b. 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/GBRKQ2254973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ecde980892bed7713074aebf37927e209b251a2bf0f3f2c0761c1f1b06b605f. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBRKQ2254974.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc7187e1dc5f627f5334cfaca97ed9b125d1a07d6dd993bfdba1abaa667c2d5. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/GBRKQ2254975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89773b83833a0a2c0129c45c47419b918269bd3856bf9ec5ae7552f25a594ae7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2254976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf78058d7a5ee885872a24010c17e1887d25a67acac402e2e030de28b517d8127. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2254977.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14baaaa3a37692b667018551c4a390543f34a276c345bb3fb7272efa101152dd. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBRKQ2254978.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b44d75b54317ad359edb7cefddf00f6113c4372dfd05ee8d06cd8c69d9a6da. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2254979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd64fcf64e944a0bee2457c142986cfe83a5688883a093149e5bb38a11b5654c4. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBRKQ2254980.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8384461193f8105eebb7cf9ae85071f35eeb906e9a20a5cc8053d6f4de374446. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/GBRKQ2254982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391db351b6f9c2feb3c00605e02055be5ced9f6df6018484b448f4c03ea28e2d. 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/GBRKQ2254983.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94cc4351fcfa338c79589fa690d21401f558c81c440606c36df862154fa34b8. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/GBRKQ2254984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5eb8d285eb82d80c0d6de4d12ac307ec7d6abd98570688af8b8ad708e498b43. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBRKQ2254985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ebc74e10443ba2310187ae067a0f98c26e89a9b79338a0124fb348a785799c3. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBRKQ2254986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5325f1d54dfc02e8d6ece691db961f6ebaeca43967c968440325a60e7bf6e3c8. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBRKQ2254988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4df9316233090d1c82b83000b1b624ac3ecac155aa286c706108bd314b88df61. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2254989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1300e1b1041327c9d6d8274a37815010aacddb9a960f8e72b88ce0fccfba1037. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBRKQ2254990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb183d72a2ae008a9d96af804b3a0e2eb514837cc886ea3eb14b7d2e3abaabe63. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/GBRKQ2254991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6ded64b41e60c647362ed75079da52c0b5a7237be21b21ce082826230201d99. 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/GBRKQ2254992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba418358c8192cd50bc19d41b51868b2a1584134791c0e0433ee3e820849125. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBRKQ2254993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b5b6f85405378b102734a3dd6d85b0da11267ea3aa252fa2bdfc7417bb88d0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBRKQ2254994.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ec9c8da5e0519bc894fc5cf67ce9dca8ecb5c0ac45ad0254c4cb1d434693ab. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBRKQ2254995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e2bbee3609a2db749d537cc409e9645c7b85a715eb3327142511fc8edc4bd0c. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBRKQ2254996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695caeac56e7594f1f1f9cac2ff8a37f1bb6bb35ab75a580f51e8771eef17b71. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBRKQ2254997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a76d3c96b1a910d3c72671a35064dc5d57ad67b25b6ecdcc2c62518a5d57da. 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/GBRKQ2254998.