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 0xfcfa1c5ee281247ec89ee4aec2fd6349bced894d5d7ea65790a57b771aa79d83. 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/67c3ca97-adf5-4837-add2-a15c2679b9a4.json and https://artists.proofprofile.net/proofs/artist/67c3ca97-adf5-4837-add2-a15c2679b9a4.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 0xd84fe77a262b04efa01c2d752c46aed801bf3ac7811555a2a7b7b328d0d0a60c. 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/CH8092101903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb1bb6fabd142da624087017120fecf6f55b13417c85b30b59c84aec5f55ea0. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH8092201965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f640c37934c9fd79c5ccd92f0c60c8683292c1522857fd9c9ca9a4d368d3c2e. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/CH8092201967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca2366510b12512b60d9a7207044ce71422425c35a4faf828775d34d15e2bec9. 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/CH8092201922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888dcce495c5aa5e2a3bfa63bc9f3c422e526159ea1ac6f97888085250c36c54. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CH8092202119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbe3c85f852c83d8f9ab213493bb08c49044fcce518afee39b473e115ed35d1. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CH8092302220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb78975be1bd3d325d73afde87fe42b43fce54fb1fe0d546fc096a6d36433f00. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CH8092302296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc850b3442ad22104f97f92d0d51368f868ede5247e33b29714ce6103cc4ff02a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CH8092302316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6835f592777989324d3692d976b3318e0f9bee39e0b2fc3f72edbc5958d51d9. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CH8092302341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe431112f64f222236651dfd542bc362183c9273033cea05b9e888daf40bc78cc. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/CH8092302342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7c69320497e6f09108689476d5f659078f6664ea795bcf368c30a16d507140c. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CH8092402477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b195b60e9dbd7eccfb22e06d941e0a80d32a43cdf554de56a34e52fbab0eaa3. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/CH8092402478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ebeb5a19cf0dda5ad8083cb1441d5ae9784048be3dc956da91746cf61096f56. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CH8092402479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b262083d83b400379afde49d835803e0e498506cc4406ded735615478f94618. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CH8092402481.
Männerchor und Frauechor - Versiun Rumantscha
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ed9285968cf087d581798c2785c9e252802d8a3dfc644b18544c4f76ba13f5. 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/CH4061901662.
Männerchor und Frauechor (Versiun Rumantscha)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ed9285968cf087d581798c2785c9e252802d8a3dfc644b18544c4f76ba13f5. 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/CH4061901662.