{
  "manageEntity": {
    "action": "Save",
    "entityId": "201909028",
    "entityType": "Track",
    "nonce": "0xce8db8e3b3ea3e53a64e8932f41b278603a5c7ee3c2422fd3f98743b75bc8973",
    "signature": "0x1b1a8392b0682f83c77026099c97a32d2887ce2a04516c532fa3705fa9ec12f26e1e0c51d8d998bf560bbb321cd008ce3eef4c01484439e0dcc8fbddc3b0b5371b",
    "signer": "0x9c3B758948f27dCECee5f39438D5E15d6e82FB67",
    "userId": "283863311"
  }
}