{
  "manageEntity": {
    "action": "Save",
    "entityId": "548063354",
    "entityType": "Track",
    "nonce": "0xfa19c4ab11591d59ba9122be9a4650a8d7de6495592b9b611fb9a2ad654feb3e",
    "signature": "0x758a988e48e6a1589319c3b9e9b511a988f6cf8b6bfec50b139a5435c90cc33d77bd208e51f9c60f648c11f160872acc6aef9df711bd720eb10fd2083abe9aaa1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}