{
  "manageEntity": {
    "action": "Save",
    "entityId": "1905711220",
    "entityType": "Track",
    "nonce": "0x20c125e197fe83511e636de55aab3e27a7c0dcb7c3f1db49d103d56b514239cf",
    "signature": "0xbbb1d1dc01040f3126df6a60ebf9df41bb6c51a2147e521c52b14e701bed81976977f532ca2ff1c5f2a0dc1f36b767e30fb60ac582c27483c06e686723a0b13d1c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}