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 0x7694f125148b152b5413c89ac21c527e8e947cfc3ff2f5deb3a992b57050da48. 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/b4cbcfc7-d4fb-4b4b-a878-78ee6bd9fe77.json and https://artists.proofprofile.net/proofs/artist/b4cbcfc7-d4fb-4b4b-a878-78ee6bd9fe77.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 0xbcd4c656d0405edf57f98df049deba060dc7371bb449309cae48489a1aee3712. 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/BXYR22500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x978db7fd8857677f8e4fbc46d713a0eb7d3baeaeabef29ea9af4550cbba517d1. 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/BXYR22500002.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a10a72f85fa3829a0cca4faa5a088f7260643913a584967a82bfddd303f548. 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/QZZ7T2460635.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125b913cf7268166e4f874019466ea6235029c1c55a13d43088e99fbea06d597. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZWFS2428272.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d796ab70a8b32c6ef7c919770a6d2401c3dee2c52c5ced00dc752c23a564e4d. 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/QZTAZ2495247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e232460c2d90fd5c6100ccece76870c8c1081f6e35a09279a731209f2e095d. 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/BXYR22500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e39ed9ffc20174d771ca2fa13bfea96562b8a60100bc43a1a9eb132935a626. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BXYR22500028.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40240855172628436f86729a6870ff7c41eb5c07a481beb419cbbe900d213d2. 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/QZNWZ2567461.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed8b2d1e57c03eee6a3b9b30aed2f8c747a6c113f125ae44fa7042911bdc934. 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/BXYR22500019.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x540927f58879d20d7b7e4fa9473dfe5e18c1cae338098181422e81b4061f9a23. 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/QZK6G2501418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261baa3d7d17c207ab9e64e0d36425513bcedab8cbd304f0dddad1032fb21030. 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/BXYR22500017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7fd9425614c37ee23cbff8e9d39c6ee41554e96a20c226d50e55a112cc1ad8d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXYR22500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b2684bd4096ce2b4213ac6c8ad7150b6e00cc9966c7b08bb5bb6241ab6c4d5. 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/BXYR22500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31aebf28d9fbadecf06134a8b73858fe7f5a135fccd36ac2d4d5f0dcf8d5540c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/BXYR22500009.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea67a03fac95fffa5c24f598d81b472b44e778580271bf7c3413337606ecf33. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ESA112426830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f0be2fc591a2b24fbdc0eae1ccd9d93bd1eea0bba0a9e6bf3f827d4a7f4f73b. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX9ZT2300279.