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 0xc8f76db7c87b0c5c18e15938269fe97050a07522c11b04e2928512f78fd0a33d. 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/2993a6d9-aa1e-4f2e-8c02-eca2a7647be7.json and https://artists.proofprofile.net/proofs/artist/2993a6d9-aa1e-4f2e-8c02-eca2a7647be7.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 0x357568787ef6c6b8c30f248e0dbd4e567fa52a00bfc75f2d7d07ccbce6d69d0d. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZNWZ2339247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1a84b6fabfd3d1df16f4a3f2a239a13c58c24834259c52e8daf11e0583215b. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZMEP2360997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfd82b3edf3c726e273a9eef601cafdc8342e0e7bfc2c236f0025f642491e1df. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZHN52331101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63ae8d167cdfe3cbb8f35656858bd699580e759f623583d0a1fd16f447ab0686. 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/QZHN32334029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4b86233bdcdeb9186eef02957cdd826f9436e1d0f530340ee1ee9ca0cfea3f7. 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/QZES92336189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb610fa64ea1f70c2811a715e42abe8f281e115a5f320eb56050213caab07b53e. 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/QZHN42271445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21561a2823f38a17a150e6b8a62c1b9b9f406f486b4ee4e7973c4c215648cda4. 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/QZK6F2121439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c8ee266c5e2f0be0defad905e9778135d5ecacd1b83433eaf43334522ec8a4. 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/QZMEM2290566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23404a618fe052a71f12254f41477aaebd75487b637563b265964bf958e6bdae. 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/QZK6K2058590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bba7ddadf510a90a06e7d2a3a9ed3086d5c7c0ac3e1df9eb54df1e284af15e6. 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/QZHNB2053437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c36f759d88ce7a45582cefc8084e3e9d7d392d58d2a55eb3b08ff7e41a6b66a. 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/QZHN92024995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcda3c16b67748ec84a44ccdf3c75cb0285bb94057d410db84a34c60c8d5fdfb8. 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/QZES72009072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4c899e057b4aaa00befbe63cae539f2ee2d08dd48831b16a863239bc17a946. 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/TCAET2055213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38f3c0d89895bc3b98ff617ed386a8cac7627aa542c84fcc4706bfdd714109ec. 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/QZHN41932669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff45ec95447bb979b8dec1954ab9b7e03ab55b20083510a7e2f542580ecb7623. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/QZES61981343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa948dc44dbc3b1358e9a50c6217e3c0b85b0e2998eaddf8882cbbc27ec0dd9e4. 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/QZDA61961049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12beeca17442645a748d2e6989504b19769f9077de10c4fba566f65564e9526. 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/QZK6N2482261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c84be0608452506dc1ac6832dcc73c04baeed47766a19bf84387d3551c21b9c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZTB32414277.