{
  "manageEntity": {
    "action": "Save",
    "entityId": "578784565",
    "entityType": "Track",
    "nonce": "0xae47e782b5d8e2198a459b0dd2f443d2c4f7af62212420d44ec25acb578dbc6c",
    "signature": "0xbaf31444920a1aebc39d245cc9bdebca85ef465e78ca26617a6cb6a18eedbc695c4792f967af38534e4ec5919d39e5c0f7bd3b47cf01e46d77b612aa7d5505b01b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}