Letai is a surname. Notable people with the surname include: Anthony Letai, American cancer researcher and oncologist Julie Letai (born 2000), American short track speed skater
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37af41f8498aaa388f573cc9d888703905f04d3ab6047608c2fc23dad973dde. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/abb4ec88-2882-41a9-ac09-343d8389fa7b.json and https://artists.proofprofile.net/proofs/artist/abb4ec88-2882-41a9-ac09-343d8389fa7b.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6be61a17346e60ef4f2ac38eb00a612f4e0f9687bf7440bf636526811c2c6add. 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/TCAEE1920457.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900997624bbbd3b8376d2c4ed1b69e61764a89483698d6f85cc939405c2ac72f. 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/USL4Q1982452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfaba329ed697fd34482e16c03595b34714b791df47417c75dbe3ed7340c899. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T11:11:14Z), 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/TCAFO2162718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551a015bfc0e2cdf409e39e4c6c35f1b0259472b60dfcaa488e6a265ac21f5a0. 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/DGA072295530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0175353828c8ed0ad2f317029df762f873ecd969edfb45209390f9a00be9b31c. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T06:55:46Z), 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/DGA072295531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2040bd791ac7bd40dc1229e9be059676dd8263c5ef9abe529db07c6e744fbe30. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/DGA072295535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2134600950dd984ac29fabecea9d2135b113a07cd7120c909bdd6341c0a42e. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DGA052313050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x642cff1a64bb1adf54de923143f0d9f1f9e0bf7f5f1163e9f1d906e8c3e54ffc. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/RUA1D2456774.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6601eda76d0b0d706a7a602b37ea8719727758769c2be43b4566be79d17075d. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T22:47:40Z), 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/RUA1D2456776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e6738c9f87abfb129f60f391773e294ec4ddaaf9604d0a05057b38e13087e5. 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/RUA1D2456778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa0928bf9d3aaa2419418cbfc6779ea608335219d3f909fba849b883464d2746. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/RUAGT2438150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbb86f5bf8b72682f0a7f772b685cbeafa5bb25f11fd5eab1d88f906e573af6. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/FRX202514167.