{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557710239",
    "entityType": "Track",
    "nonce": "0x459ef47752035ad5e8852291d173d8e9f2de15508df48e72587509977573fc2b",
    "signature": "0x8830680dfd7ab25137a39c8d28e89e448ee13004d8c5d8a608f681a9627303313e4a58ce6c954a7280b8abdefc62f58b84045da99d8d10f09d897b804fe56cef1b",
    "signer": "0x36d29AA5C780341f3b35bDE6c1411a7Abcf8794C",
    "userId": "571117272"
  }
}