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 0x0fd0a254ad9114cc5f67323c7870f10e99a2eb9d4584f0abd4a8fb37d8acc854. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fc0d73c0-65fa-435e-a5a1-ac41ce7c47a8.json and https://artists.proofprofile.net/proofs/artist/fc0d73c0-65fa-435e-a5a1-ac41ce7c47a8.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 0xef1ab3d64d5edbbdce35362505cd2ba4e939e97f884fff915e32bc3d8a6a83a3. Chain 2 (Bitcoin): anchored in block 958384 (2026-07-17T08:27:02Z), 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/US83Z1508606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe75cb972ecc0b7449e8dde3bd4174e093ec20b85bc2f67037531b672cfbf3be0. 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/US83Z1513952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd8f27f37d17e183dfb7d675f735800d97df0fce515681df49fa7f21c65e4db. 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/US83Z1525335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf473e98055307627519b4ce77ec61ff3cc9145affa157ffd0c4c530f7b9fa13. 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/US83Z1525336.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x478d72ae7d33c7666dac8753d787ccdcfc725614392a90fcacd83ebde23575f3. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/US83Z1525338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd6bde93ff0652cb5cf569b1591103a1a885f43c3866231ca17ef49d35039da. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/US83Z1525339.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eca66590a71e274f6a947b1ee9668024d1c3768e6179443f8f54d888255d3d0. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/US83Z1525340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457e3e8fe051db4489185b1ababc9723f3653dc339ff71c4bd04d525d39e42ef. Chain 2 (Bitcoin): anchored in block 959076 (2026-07-21T23:41:40Z), 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/US83Z1525341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efb93d64cbfb2bfd0b7a9364cdb569727b63c63cc95c9190b0295e6c784db3b. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/US83Z1525342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x425a38975e935fdd40a863b5bf0713b6e34620c8d09faad5f588c01f86227591. 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/US83Z1525343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8d886cb54c13203f8cb63a7c615ecb68ca860377d7d004d45542df5e25a220. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/US83Z1642087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e41613073d64bc1a6b502ae1a352212add05fb794eeb0fcf85cf65b9e7f7d7a. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/US83Z1653682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0701733942be3ddc665776ca197b050753d723cd1bf9352d3a8c23ee4e4ef0. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/US83Z1659746.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29206625c2e8fe5d03d3347b35d20f27e7bb0ee9c8926670449931e6ec3a7da9. 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/US83Z2012366.