{
  "manageEntity": {
    "action": "Save",
    "entityId": "1338123584",
    "entityType": "Track",
    "nonce": "0xbf5611a3a63c87ff8a71e55d7c617466fa4c90e6eb5f5f56df2b5877571c3aae",
    "signature": "0x19652767e3f07c3c99ff2faf811a2cbfba23a6b175b805ef48dc0dcfff3590ad05554afb7049567255172f6b765f490041d03bc2459649044a32cc56cef595e51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}