Mark Olf
type: MusicGroup
description: Mark Olf (May 15, 1905 – June 7, 1987) was a Jewish folksinger and recording artist. Accompanying himself on the guitar, Olf documented and preserved Yiddish and Hebrew folk songs, many of which he h
popularity: 2
followers: 121
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x44581d55a77f352334d11b363138787be2750dd4b945a28997661d1a9b124888
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954623
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954623
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cc31de18-4e30-4d97-a7ef-8c7bdc584371.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/cc31de18-4e30-4d97-a7ef-8c7bdc584371.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/cc31de18-4e30-4d97-a7ef-8c7bdc584371
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T23:40:06Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x44581d55a77f352334d11b363138787be2750dd4b945a28997661d1a9b124888","name":"Mark Olf","registered_at":"2026-06-20T23:26:09Z","symbol":"NIM1748504","token_address":"0xbdd4bcfd37beb54d26aebafcafe8854d99438291","type":"artist","uuid":"cc31de18-4e30-4d97-a7ef-8c7bdc584371"}
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 0x44581d55a77f352334d11b363138787be2750dd4b945a28997661d1a9b124888. Chain 2 (Bitcoin): anchored in block 954623 (2026-06-20T23:40:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc31de18-4e30-4d97-a7ef-8c7bdc584371.json and https://artists.proofprofile.net/proofs/artist/cc31de18-4e30-4d97-a7ef-8c7bdc584371.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T23:40:06Z
  text: {"copyright_id":"0x44581d55a77f352334d11b363138787be2750dd4b945a28997661d1a9b124888","name":"Mark Olf","registered_at":"2026-06-20T23:26:09Z","symbol":"NIM1748504","token_address":"0xbdd4bcfd37beb54d26aebafcafe8854d99438291","type":"artist","uuid":"cc31de18-4e30-4d97-a7ef-8c7bdc584371"}
album: Jewish Folksongs, Vol. 1
  type: MusicAlbum
  date published: 1951-01-01
album: Jewish Folk Songs, Vol. 2
  type: MusicAlbum
  date published: 1954-01-01
album: Hebrew Folk Songs
  type: MusicAlbum
  date published: 1957-01-01
album: Yiddish Folk Songs for Children
  type: MusicAlbum
  date published: 1960-01-01