{
  "manageEntity": {
    "action": "Save",
    "entityId": "907647206",
    "entityType": "Track",
    "nonce": "1792508053826405921",
    "signature": "0x8edef4355a268dde196eccefa01c81f7862d92fb9a6e4c0febdc79dcd965413c653b051c1cc86f6e7cfc3f7ed3b89aeb61368ca14c13d89bef2319826ce4ad981c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}