Harold Herman "Hal" Schaefer (22 July 1925 – 8 December 2012) was an American jazz musician and vocal coach. He coached Marilyn Monroe, Mitzi Gaynor, Judy Garland, Robert Wagner, Jane Russell and Barb
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 0xe6dc4d397916ab6b7c03287d3cb32dfbe1068d59b80931194d29bf30a6fc6194. Chain 2 (Bitcoin): anchored in block 953928 (2026-06-16T10:21:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1dda9425-ff88-40f2-9929-276e280e670c.json and https://artists.proofprofile.net/proofs/artist/1dda9425-ff88-40f2-9929-276e280e670c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vintage Jazz No. 142 - EP: Dancing In The Dark
Just Too Much / The RCA Victor Jazz Workshop
Modern Touch - Hal Schaefer in Cool Mood