{
  "manageEntity": {
    "action": "Save",
    "entityId": "670121",
    "entityType": "Track",
    "nonce": "0xfae05554ae01fbe32b94d1fa12c3ff1cacd61a257288cfbfdbe1b9e453def286",
    "signature": "0xbace0c3c9f65b7be3e2754facaa0e6911f2ed3fd2088040886ee30fe300cb4a725e84deee9a815d3ebd5ff93df61163a0c71d0062b98999637cb83333d4a3ed51c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}