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 0xb1743ef0da34d881619a418bcd7e723f5af9cf925c8798aea0dc41c26454cc80. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9fae5420-3f73-47a4-aad9-3f737455c523.json and https://artists.proofprofile.net/proofs/artist/9fae5420-3f73-47a4-aad9-3f737455c523.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 0x4e44fab34994b1be22fe79ba400a0f6c91984bb8f7281c6d1cc3f08e09324bcc. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/JPE561011613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec6b7e2a8d35bf914943444e76f143329ad1ab8bcd56afcbca2c1441315ec587. 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/JPE561116275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4380c9b0975e652955999b5beaa99e3de51e83b2e1b5cb145ddf6901010376f8. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/JPE561200587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86a32dee66a7e6de2dcb959f63202e84ad6c25a344ff2e41b85ec8b63ab8f4e. Chain 2 (Bitcoin): anchored in block 958705 (2026-07-19T08:43:25Z), 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/JPE561200588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2947e69af782087cd53aa71389f7030339ef7d1b9b4af30a47d204072aaefe06. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/JPE561203049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1529ea31bb955cbfd84b181db358df5d4892bd8f217eab7b975557dabf19aff. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JPE562107732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x791492c8951798bfb351dabf7eb233974000de63ef2d711440bb4d502ba98b3d. 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/JP92Q2400208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c4143947ae8d10520a9894b4520760da2f85d3d6222ad15617d496532000570. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/JP92Q2400209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4073ab3c4368101970f877ad83fcab7b39c95a1783305fb07b1059450042b024. 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/JP92Q2400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b655fb985f5e15775a1084877d3b194f293781df01afcb21c1f1706c8c43c7. 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/JP92Q2400211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82934f15b7831f56ce1c1d13e0432931726f3f2e5acdde6072e85fd48ac3b211. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/JP92Q2400212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e41c3511c7365d68afc4df6ff88496607adecbc6ae22cbfa52206d98168e249. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/JP92Q2400213.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3560a0ad2df92608d7655d6b0c6a122ca4ab73281d361f5777974b355728db0e. 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/JP92Q2400214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb88c6076cdc772e49550feb2a914e7ba95231e51eda727881282d25ba999ee. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/JP92Q2301041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a2ee4ef2cefd7502558903a1f45178a3aa08cd08eb7818693e9c36b38e40c72. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/TCJPT2214046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7bc2b14876df11ba7e34bacd4bb8471dc848d7a11246fa260b3f75fd7dc4ca4. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/JPJ931300270.