{
  "manageEntity": {
    "action": "Save",
    "entityId": "473037549",
    "entityType": "Track",
    "nonce": "1788986312099478381",
    "signature": "0xa65953c97c3fd0c44447085081b7eee0ee6321f4bebc639ced9e3a311821505c26160bf1410d0f1710d4fd58128f10a9de86b044fefd3eccab00b2864b391e181c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}