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 0x57d03fffdf41151f66473dd1e2c1f44ca124447ebf977d5b52986ddd13671641. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8f10e416-ea75-4205-8e68-e6daeb5e144d.json and https://artists.proofprofile.net/proofs/artist/8f10e416-ea75-4205-8e68-e6daeb5e144d.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 0xe0295f841f7894f7d14b8b7262228fbfa33182f93136c69e886d60ebb23caad9. 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/US2C50400301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0a355778b5abfcc1ca46651e8a155254fa1e2dcfca9dd2ed45f44ff5dd3ab1c. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/US2C50400302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e4d5cbb5c43aa5e3a50ea8780fed215474238f0c315e2f81b952e1c9ce0d03. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/US2C50400303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01807895783415ee5867a61f49f0022ea93089fe55d5590f1241b797f4f7e07. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/US2C50400304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0b67bc53094f1703b654b2753f28e45372d0f4ef377511577604f1e9153a7b. 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/US2C50400305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73542527a371d10fc51c449d1a54bcfe5892d522a580da5bab9f20ab3605dd32. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/US2C50400306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8f68cd9c1a77c8b7ab79f2b17e9e05909db6199fbb57239af06a53ac51f7c6. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/US2C50400307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0962ceba3e45dc39d74a53161e015d5c634291c37610b9fc88e0aaf738e75f29. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMDA72190225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dbdc3501e7621da0ae9e7f3ca476249a3d80c5d30535123119bf84508af6a56. 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/US2C50401601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3384d9b539f3b880fe5cfeff9a55d778816cfe34767609e673ed5775033e391. 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/US2C50401602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3081dd16e063c8049c9caf135c7f48092b1da74ebe6f0e7999b342e2c89a7d8. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US2C50401603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97844645f0af8038b74746c8ff758ca2e8b20dc3b7f82a63c7d32554a3501314. 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/US2C50401604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee2b3489e4e31e2ad92276c5dfce1043188041b5df327f98309dc6c4d38a5c9. 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/US2C50401605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bdee66a380c95d930994f201ea154a71554432a2bc4b110a3c8748aff9196d. 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/US2C50401606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351485d1d10728a898a4e907e3559f73225a129d82d06750382d18f6adf9fd4c. 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/US2C50401607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc86329cb3f6d073bc9eec39fe52ac3b2156b2fc952b4b87a6b05f85ff9f22388. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/QM4TW2144484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55671bec6ba016c7abec00b75974cac53c20656ead3342e045c9d293c501a3c4. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/US2C50401608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3b77fb06a1660f1d3a6d3e2b28c6987f9abed642284b6dba75712246550132. 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/US2C50401609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2883ea6c173f59cb2cb95023c7999f8bfc3609f62269f974bfdd130acad5d252. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/US2C50401610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5615f99b06eb4efc511e5ea7424125d1c05c6074af43dafc910a407100296e36. 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/QM4TW2144488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d2d98d6d7320f0aed72a8a359481a889460332d74fd3e34157c4f33b9329438. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QM4TW2144489.