{
  "manageEntity": {
    "action": "Save",
    "entityId": "890985435",
    "entityType": "Track",
    "nonce": "0x7a38b4cb119c3aa92cc741570eee5de37e9c69905e1034d492ce6f6c38bf3735",
    "signature": "0xc9c9a8b8c31dacef9bf9aa96d33aa860313a387804992095e1f75ce4c480517c2eefdba2f9308ad40c5b9ed4aa0a6539a8cc39058b74e651528e2af1740f9fae1b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}