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 0x02d8c11b5b600e04db27e09df9221eabdb1fdd1f7273ac3ea652890e7258a01c. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5ce20ece-378e-4d3a-af29-0e7b4588e40e.json and https://artists.proofprofile.net/proofs/artist/5ce20ece-378e-4d3a-af29-0e7b4588e40e.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 0x1e700dfe18a14a269c4b0806e0845a76da5dd0f0a245d15d734832e67b4654da. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QM6MZ2590692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4adf7008c9d35934f8b53468e362c52c21546128b685e98e5baf5c2ef80869. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6MZ2590693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dd92f8fdde610168d2e3520f9fee55a431f5f8ad9d7941b456165aac51b7e78. 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/QM6MZ2590694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa7ac48ec24367325c7676d583fc149a7a8a43f8e7de74f68df276f593b16d4d. 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/QM6MZ2590695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9bae16937cba1ddd90cc6141d42d410571d13f267868792fc371a57948561a3. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6MZ2590696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a543728ea17e860514580f62d1c7e2ea323e98dfc9f57a495f1f64981360073. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6MZ2590697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0584d1ded2b61366452c4193d9e024985b08f78c00c6d96268864d715d753dec. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QM6MZ2590708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c0ad7ccc96f8b2df5c0dd12f616517620ca39ea6c01f333475668ab9fbcb8f. 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/QM6MZ2590716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8852744e0b5bb551c425f9e0d4a451719c48c55491bc89075e5119ec8123781f. 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/QM6MZ2590717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9d829ed181d7a9a1b9eb3645afb3525ed3c30d6dbb0074b99999c65137f9a0d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QM6MZ2590718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d021005cf8ea7757b839439e4e4b0870b5da00ffb3b8ba3f5c2cea47079693. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QM6MZ2590719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dd675ea8ced8e64026bc1056cf354d57a02a45ca9eced78d7d9561555e5d5e3. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QM6MZ2590720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b1a430797cca94c91717d2bcd631bfd4b8616e829ad653e185df85ab01dc9b0. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QM6MZ2590721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed0c3acf1963faea4d59861d3a4a1089b79b2e894934d1aa27fec4527321d2e. 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/QM6MZ2590722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76328cfe4fba350e55cf7b6da633b455e53de00a7becd7d6f1ce7e3258d88e66. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/QM6MZ2590723.