{
  "manageEntity": {
    "action": "Save",
    "entityId": "203754864",
    "entityType": "Track",
    "nonce": "0x3b267cb5c5fd4e4383f2d401e3d6520dec766230a3224aca2df0ce9c5740d93b",
    "signature": "0x843c72b7e2970609a4da1d898ff4958a44deafd3cb734f6f98be8abe66cc4d9843511ea8aafd0cf3ebac96dfb9d07afa8a85e44ff128bf841acf3729ea176c611c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}