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 0x8ce4f9fbb50528586fcb7860c62e8e8f51e26013d52fe68f1d3e1d7244819ed0. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/081f799c-586b-46be-964f-35f3f6ca2b11.json and https://artists.proofprofile.net/proofs/artist/081f799c-586b-46be-964f-35f3f6ca2b11.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 0x4b9300e65e3c82e0a995bec851909a47c9bb8b17dad4bc979a4c2b6e8b9c4e75. 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/CH7812359823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24c37ee6579ef3d654d05b3e30970bd2b3355f16c836f99f22dd4fda561c453f. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T19:06:11Z), 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/CH6540825162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6477b98defaf22875b289f69f61899dc568b11019caea107bdebc83b9c017fb1. 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/CHC382500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d05a97e96ebdf40c81bbf12675a481a3a013239eb3e13a1fe35fbdd39d8d4e6. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/CH7812410831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a4eba23e6c15f6fcbcb66b0b49e32cbb221be515d452462716176a3f3e1fc84. 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/CH7812410832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224cc258aca0dd0d71cac6cfd5b9dbc17cb1e9c1cd8f62e6475dd61191942437. 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/CH7812410768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48463f17bed303b2a905b0decf19290d6fd18ba9ba5095f44bcc14d42fa76e72. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:01:58Z), 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/CH7812410837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf69b748b23ecfd292470ebf51f5f1204ad83f9544b04fcf18a8ce02aa5a0794. 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/CH7812410770.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dca514335a3e6d1d44b3ad97839cdfd4233200377085211fcd705a031f8a5b6. 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/CH7812410840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44252ce6ba7c3095fff729ef3905b465881326f232851629ffe7e3aba756c407. 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/CH7812410843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48c1fd6047e8b9628927d85989c2efe395d13c5f22fd65d09eedb858cf04219. 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/CH7812410844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1c1aa29e10529bef2ba4e121996cebf3778daf51905543069173f7fadf3e98e. 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/CHC382500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6477b98defaf22875b289f69f61899dc568b11019caea107bdebc83b9c017fb1. 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/CHC382500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6eef0e7cb6fa68e4c801b84d0dc642aa5314d5da00916b4014ff2f22b5529d. 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/CHC382500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29f70b8dcd363de380013be889c32ff12c40f0bf98d9a2b24b16f74a4f381e91. 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/CHC382500008.