William Crofut III (December 14, 1935 – January 25, 1999) was an American folksinger. During his career he recorded more than 20 albums and CDs in genres ranging from folk, children's songs, jazz, to
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 0xbdde2e8678adbcbcc2884b4410e80fd889369ed0ae886358f3090f99d721bd4a. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f209705-e6df-42bb-ad5c-78d2b5d3c70e.json and https://artists.proofprofile.net/proofs/artist/4f209705-e6df-42bb-ad5c-78d2b5d3c70e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).