Louisa "Blue Lu" Barker (née Louise Dupont) (November 13, 1913 – May 7, 1998) was an American jazz and blues singer. Her better-known recordings include "Don't You Feel My Leg" (1938), which she wrote
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 0xfacca70a3a728cc9a6bbe2700eb970114a3c17a4116600a75052141fe1d33a35. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5fdbfa01-8c8b-4a13-8101-4ae0385cf89a.json and https://artists.proofprofile.net/proofs/artist/5fdbfa01-8c8b-4a13-8101-4ae0385cf89a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Masterpieces Presents Blue Lu Barker: 10 Greatest Blues Hits
Blue Lu Barker Remastered Collection (Remastered 2015)
Don't You Feel My Leg - The Best Of Blue Lu
Top 40 Classics - The Very Best of Blue Lu Barker
Complete Jazz Series: 1938-1939 - Blue Lu Barker
Complete Jazz Series: 1946-1949 - Blue Lu Barker
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 0xec15c5456cf77dc818c1404c5e5963f99b738d0f9566260119343b86bfb17672. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/PLH492432115.