{
  "manageEntity": {
    "action": "Save",
    "entityId": "91123",
    "entityType": "Track",
    "nonce": "0x0492c35c33c515e76c4864b30e44606c3b462d29a2d14721aed5c7b6a139854e",
    "signature": "0x2d3af94373fdca4fe08a647bcdb2146ef89dbc056de35fb932aa1a4da92d84d22da36d3fbd379b0b75d732b30cb1162a76e779c90a7fcaa2520acb3cbf5180a31c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}