{
  "manageEntity": {
    "action": "Save",
    "entityId": "751757707",
    "entityType": "Track",
    "nonce": "0x74e3bdb59edf24c60437fe2f51bfcbc987e4ca66adfd1ebd328937fb15451ce6",
    "signature": "0x857ee9d8aa512ff6805b5b1a5f4ee78f3ab5c96a67578af89bcc2f2ffb5a1b65343f0c9798458bfffa8e7ab5f6e63e7ea07eb131f964d0c2955374f6a97f10521c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}