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 0xaf4b2b99ab76fa451d2636e2228015e55fd8c8058086581293d993be7b871dae. 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/91189907-243e-4256-9f2b-6a6d6cabf4a0.json and https://artists.proofprofile.net/proofs/artist/91189907-243e-4256-9f2b-6a6d6cabf4a0.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 0xa305ed94d81345af8a27af601294dc4aaa9b0b0ad126629a2b06e7a269970014. 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/QZ5FN2550936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5e7f5deaf821c134aa7ac5bb4ea9136ee4649a3eab7fe080e0ec0b26b84f3f. 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/QZZEB2319876.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa919c29b99a6f66db0a247430860c2bb3e8a6661920c0702f3ae34764f383739. 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/QZ5FN2445542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6faea796ae22ca8e987bb2b71388a18f99c36eec93fb633c742aca56e01c814b. 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/QZZEC2319355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f8754337fa363bd3ab8fab317123b1bef019b1886c0c8a9a076eab905dd5914. 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/QZ5FN2445547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6421ef9aaef22a8eb4769ab2520c5f6ecbffd691a0b1eb3ac43de9a630424bb4. 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/QZ5FN2445545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7e16535665c1921ea590ac92345d4563e01009b70af01d9ecf14507d7b0fe12. 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/QZZEB2319928.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e7386badb42858db25315f87272cce826a86a2221dc7554109deafe27d12d0. 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/QZZEB2319907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eae6595e90e73302f86f403c8cc32e47fe2b14948947149dfb06f50a1be677a. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZZEB2313879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed3949e580ea40706dbdda674a33b68436c85cad338c0d3757c3a6fe2b0b81b. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/QZZEB2319861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x358dc088b2f2d206374fc39a032c76aa1cb562f2752fcb6b17e6d319d01c8ebc. 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/QZ5FN2550938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb85b119241d90d2f70a349f875eeb5b9a418b337118bb26b86101602a7e0abd0. 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/QZ5FN2550932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08883eef43548c5283024d13f082d7a97b3ff1d0581947152290ef58b3e0b885. 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/QZZEC2462377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5191d8c9ef7161b494afa3760b680acb33a6cb4968573bdcb21d177015384d8. 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/QZZ8B2432468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fefa8d2f3a17ed4ef85a8c755bbe3572968d7b03e575aae8515747af9fe47f. 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/QZZ8B2411072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5634355e410cfc4508f7a1af28560c43e381f53e1702b7352695a6eeff33267. 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/QZZ8B2411071.