{
  "manageEntity": {
    "action": "Save",
    "entityId": "851270694",
    "entityType": "Track",
    "nonce": "0xfaa88e0fb16c84e20fc06fca664471bdde5a5203cfd7a0ae5d1bbb2fd27e5bfb",
    "signature": "0xeef9848c73c7e4c7d47b971f8e7bbf0dcdd5efcee2d150f202c18c85048073d81c05561f70379e8cf99ce40605abe218964894843f8718665e8398da0fdf007e1b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}