{
  "manageEntity": {
    "action": "Save",
    "entityId": "1963400828",
    "entityType": "Track",
    "nonce": "0xc77869745f17e93c94ed5e7403f66778233dba33a2c56db884eff37b6302fdd4",
    "signature": "0x4ee27dc5539febcecc6666ba887166805502dc6386db491b0393e3b28a72435e3d536559b0e4321755c61797e203ac2e98a5f5ee5bcbeac0867e777a91d317661c",
    "signer": "0xFB1D43C768E2C6359F2e1c154f6C5f9187F343e7",
    "userId": "166447128"
  }
}