{
  "manageEntity": {
    "action": "Save",
    "entityId": "200410530",
    "entityType": "Track",
    "nonce": "0x9b2dcdae6d8635106fbca932417caa89960f6adc1167996f0e90a4be452a8c43",
    "signature": "0xa913ce13d1f6c8cdab72839e2ea14f352f18d750e4d448cf05faea942a670d9914a3513b654b80819aaaaef59b0c69a735b7e21313f2425bcc4af3b67f3554e51b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}