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 0xe52ddf858fc056c50a7c24a3ba683fab6e7eabe98ee2e4db5db538c3b6f0d12a. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d4e4984f-8660-41a1-b12d-05c1ea7759c7.json and https://artists.proofprofile.net/proofs/artist/d4e4984f-8660-41a1-b12d-05c1ea7759c7.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 0xa33001a86848beba0d3c4e8e68a136bc5b33ab5c19e031a25537980029e91353. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZMER2149116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b3bae6442c3573dda3ee8e9a245b5a725294f8f1a2c1fc6a0861ace56861b7. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZNWZ2102282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e02a60293f37dfd45cde7d0538cc80fc7378f76f750f9fe31d212d749ea2eb. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZHN82299506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d9d0b1cdda49248df804528a35292776cbb0aea426490e72f83c298d56ee623. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZHNA2298939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb1f06d635d715158110a09dbc7502942eb5827a571dc18043b8998655ed604. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZRP52521948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab6bcd33c3e71a5e77344b5fda69e957e31141c82303baeea2adc348b4f8ccf. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/QZRP52523488.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1302e054e06cede500b5bf21a6aae5a6502763ad0c60be14eb895b947de7570b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/QZTAW2528743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd1c6eb831b6f3345b827e8c713f59901760734dd7987fb3680d55a444b7466f. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QZTAW2528744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6fb7b4cbc5e99877e4b177938a2baf152a32561f70eeae93e4b71a0d885b71. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZK6P2596284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdafbec84f57e1a3e5ad3e6bf67454ab57d703c4b7ed61cf3e6d329199c3344cd. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZTAW2528746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b6d93d3b8d8c9725690f98d7d250c91252e4a4ddced759c15dd0a805298548. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZTAW2528749.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3fad2cd867d05563c2dfe813cbfc07c9840f82f315be856e5018daa47587800. 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/QZTAW2528751.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ba1a698a85e92ba5d054afdec7065d1bf6f00d22fa1c7395e37edfef7422ed. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZZ7U2539477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e90fa63e476511678a68f84b57e75f1ba7d4026c4d01c7bc9fd5283a96d39cc. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZMEM2412231.