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 0xcf073b35decb24423e3a703253eac0056f48f3f322ec9b62484209dd6ab69200. 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/d07cb2c5-33ca-4259-aabd-03fb6544d4ed.json and https://artists.proofprofile.net/proofs/artist/d07cb2c5-33ca-4259-aabd-03fb6544d4ed.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 0xc43419cb1f60f26b2b31045af359485390419652c73867dd2124c0db11e49413. 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/BCARL2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0798bbb34eab26147ce517b0f8c74c9a62ab646e0f1e3bf44454b3f0f13363d9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BCARL2200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcddbc03961ff684657497a82a5285b87e5783fb6b76b57ea0ac531e5d689803. 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/BCQ6P2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bec8166931025fe867d3c55bb5f6d18e0837ade71f1f73ca2c2e8361fd8c2b. 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/BCQ6P2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4c5dea0549a5dd0834c598cd7ce13900cee1b300c818271d12c549ff1866b21. 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/BCQ6P2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01d2e215d2139f73f95b0282e7b2712112a1589ac1acb8c69e1dd4870cf213dc. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/QZW9K2474836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6ef7fd8bc8970d67d21861be026d47fc727b7f544fb2d2ab97b75283348f7c. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/QZTVM2488660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca967cba2882084b3c16a57ff17c0ff6bc19deeb56369e86a59224ba5767eaa4. 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/BCQ6P2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400a8520e1543d4d5f28f066929b5a647c046b19194e420ebee8f1fc43484f6c. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZMZ92474970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50be1ccdcfe76f5eaf3b181b0e3bc7dbb8b08507feca31e3fc4467154ff43f74. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BCQ6P2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb7adc25f24aeeddce99c8685f4e0cb7f6e5595671557692af799dc891e4990. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/BCQ6P2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa08b3a2c267c888cb45bdb6e6de731b4d8908cd62042e16ffa0ffeeae8fb00cc. 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/BCQ6P2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5659c2d9736235d2a16e19f9d770830e0a21591bffb6774be57ec5869ae0105. 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/BKPM22500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f04d8ec86fbe39275e023f81163fc197a913c5aff905b1b565ca439bb5ef6f8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZWV32561781.