{
  "manageEntity": {
    "action": "Save",
    "entityId": "1864449806",
    "entityType": "Track",
    "nonce": "0x0a1ede2ca6119b50734947983a1b017855becdfcc047a2b76a18a0161c6b8922",
    "signature": "0x586f2612d06e04675f61b51629e851655465c453cd7e2ed0032277d861939edf1c3e4112de43a7c95ff2dd678de5973f625148b206d864d733d464ffb524afd91b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}