{
  "manageEntity": {
    "action": "Save",
    "entityId": "1572854579",
    "entityType": "Track",
    "nonce": "0xee2db36d9627456a41957c041835d638025ca8a8d1dbb34b091db3ed6024d370",
    "signature": "0xc3ff54df970c7f264779afab8a7bb7301b310e86088333a4154ebca03b3d746861069cd4f09dbc1ae87280d0b22e5dcc45fc95a51034e6578400f8767f5a3c091b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}