Florence Glenda Chapman (née Ballard; June 30, 1943 – February 22, 1976) was an American singer and a founding member of the Motown vocal female group the Supremes. She sang on 16 top 40 singles with
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 0xea66b846893af55f18ca0a2ea61e061c78f82ad1883cff0e862df021f253d6c6. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc139380-2577-4cb8-a8e2-aaba8a0e51e3.json and https://artists.proofprofile.net/proofs/artist/bc139380-2577-4cb8-a8e2-aaba8a0e51e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).