{
  "manageEntity": {
    "action": "Save",
    "entityId": "1596909729",
    "entityType": "Track",
    "nonce": "0x01948974e0970190ce07cd09c3e2e6d1551b2d525472334463e4a5b3047bf87b",
    "signature": "0xd434527c3151fcdf703ccdf808b82e77f8d358c82f87ed99d1def92f0ff77dbe14957f91c70dcd9b890ba723022de7b3d151fec61fe45ae76173fcafc81708fe1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}