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 0x68bbcb8f866a0f97b6f881888520d04c0f6c992dd8dc089d4134020f0cccf140. 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/dc63b3c5-f703-4c52-9b57-9bbae8db239c.json and https://artists.proofprofile.net/proofs/artist/dc63b3c5-f703-4c52-9b57-9bbae8db239c.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 0x5b88122777517a603cb863ec9a1deed40837e720b66433e2dff44e9253991d13. Chain 2 (Bitcoin): anchored in block 958660 (2026-07-19T04:21:53Z), 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/FR6V89702982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f4a8084b3ee2473646df3ddf83ef4c4630578ba3e58f727e1195d1c0adc55c. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/FR6V89702984.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66fafe3fe32629df2497d767b71638af58166455b2e3058b750b3b9365b8d7d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/FR6V89702985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x848dfe7d882f1dfd6613714b95377c7d6554f55f951106b532c5271b66bc7525. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/FR6V89702987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4af6e03d4c9e18a6631e6d0b7c52ad220859f36e1d8170e8a920b548089bfc. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/FR6V89702990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb892c2845ee8e39f9826e582bddc8c0428752ff03d954bab53a4b0b23c74565b. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR6V89702994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabce5c90d5e873e84a99f65a45f2834e0fe8c54d85adc07d1d276f5b82532d63. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/ES6069918401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x256589df392bbcf6ac213535ae54cfdf02fa5b86076024ef52c27e7e36719696. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/ES6069918412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf034f306a15f1f15c7c6abd4cb02f84e79f649d626e456bfaaab813b52646541. 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/ES6069918414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65fcf8605d0a799a29dfaef592942650cb1dca9427be48e2ec11c7cac1e5b29. 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/ES6060330601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f3958680613030231800e3a262e33fee9a9eea6d88d0a11725e4c49508f51aa. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/ES6060330608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d15f245d19d864274e876fc9d048fe8307689a88c959f01b2561388c6fcb22. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES6061948701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77c41d678e885746a89baff58bd0ea2b43c755354a14a8fdd96223b55d4ebb0f. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ES6062287101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e60413238cbf1e3abf6d434bce54755dc9b35b53e82dbb7935f330ef2e1a52. 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/ES6062417101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d80a6900dd6fac13d71da1daa5d9b39369151d88de0c3b8113309267ab34940. 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/ES6060229526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x184272fff8f7387aa838595eb236484df4c43df259177b606d468255db9a972c. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/ES6060961819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67a3f69a7583a21e38de10c9cdc9afdcd8239ca946287c9b60b1e94f8c8aa9be. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FR96X2331186.