Paul Vaughn Butterfield (December 17, 1942May 4, 1987) was an American blues harmonica player, singer, and bandleader. After early training as a classical flautist, he developed an interest in blues h
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 0x3fd76abefc19d1a48a8ba93bd41d85d38288e3d5e5d8f9053d619eb84daf4dfc. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b2fc857-d0b0-4598-b956-b42c8a8530e6.json and https://artists.proofprofile.net/proofs/artist/5b2fc857-d0b0-4598-b956-b42c8a8530e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Take Your Pleasure Where You Find It (Live: The Record Plant, 30 Dec '73)
The Legendary Paul Butterfield Rides Again
Heads & Tails Vol. 1: 1/19/72, Lion’s Share, San Anselmo, CA
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 0x25cbbdd81231df15756c899302e82f587d71a4e972eea15dfa877c60a794b8ed. 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/USATO2300190.