{
  "manageEntity": {
    "action": "Save",
    "entityId": "406303",
    "entityType": "Track",
    "nonce": "0x968d3db759e4a55febff09d13c04da512d4fbe2baabfbb40649c3ab80ff51052",
    "signature": "0xa976b18c7fb1046bd078fc3569eaa9858325673fcccd7d5184988f75aa50e8c13fdc8a1a9e664e0ce4122ee945d63b754381d774eb8df006f2ddcedfc6a30b451b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}