{
  "manageEntity": {
    "action": "Save",
    "entityId": "437366060",
    "entityType": "Track",
    "nonce": "0x3017e6131e26afd31a6a174ef43d84fdf52bc236b34ce302f9741439e5378a24",
    "signature": "0xf34bee3f1f4232b08dbb777b7243d1f948472c99e10b89347bd3210d3839ce0a764379e5f3b465481f41d168e9c9b9afb2424604717cc4f706581569434814061b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}