Hal Schaefer
type: MusicGroup
genre: cool jazz
description: 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
popularity: 2
followers: 71
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xe6dc4d397916ab6b7c03287d3cb32dfbe1068d59b80931194d29bf30a6fc6194
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953928
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953928
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1dda9425-ff88-40f2-9929-276e280e670c.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/1dda9425-ff88-40f2-9929-276e280e670c.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/1dda9425-ff88-40f2-9929-276e280e670c
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-16T10:21:55Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xe6dc4d397916ab6b7c03287d3cb32dfbe1068d59b80931194d29bf30a6fc6194","name":"Hal Schaefer","registered_at":"2026-06-15T23:58:27Z","symbol":"NIM0873003","token_address":"0x5592c45533ed87f01ceb4ee8acebbd1b634daf44","type":"artist","uuid":"1dda9425-ff88-40f2-9929-276e280e670c"}
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: 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).
  date published: 2026-06-16T10:21:55Z
  text: {"copyright_id":"0xe6dc4d397916ab6b7c03287d3cb32dfbe1068d59b80931194d29bf30a6fc6194","name":"Hal Schaefer","registered_at":"2026-06-15T23:58:27Z","symbol":"NIM0873003","token_address":"0x5592c45533ed87f01ceb4ee8acebbd1b634daf44","type":"artist","uuid":"1dda9425-ff88-40f2-9929-276e280e670c"}
album: The RCA Victor Jazz Workshop
  type: MusicAlbum
  date published: 1956-02-17
album: Vintage Jazz No. 142 - EP: Dancing In The Dark
  type: MusicAlbum
  date published: 1958-10-10
album: June 1st
  type: MusicAlbum
  date published: 2001
album: Brilliant!
  type: MusicAlbum
  date published: 2011-02-22
album: Just Too Much / The RCA Victor Jazz Workshop
  type: MusicAlbum
  date published: 2022-11-03
album: Modern Touch - Hal Schaefer in Cool Mood
  type: MusicAlbum
  date published: 2025-08-08