{
  "manageEntity": {
    "action": "Save",
    "entityId": "492674",
    "entityType": "Track",
    "nonce": "0x7d50864622bb807c5b1798e36f6cd29585bd6b28bb0312474bf0eb17c143ddf7",
    "signature": "0xd4091e1dbe881f6f4bbfad007c4712faed37c5b32126b3bc36f97c48018ad56351e67376b1139fbce853d2012e7fe1a84a88178f2542a3e6a3f678e4f8855f371b",
    "signer": "0x0a5148A3f132E6696c1Cd3FDA8465fC5fF17d3D2",
    "userId": "803288761"
  }
}