{
  "manageEntity": {
    "action": "Save",
    "entityId": "665569",
    "entityType": "Track",
    "nonce": "0xea4de7e0c634e33d3dc0fbe2b0cd62ea137c89533e0054af45fbbc237af187df",
    "signature": "0xf4a23d6793cb030bbd20f2eb101e86f1a5e69612dd241d6a0aea77c67b8ca8574ee6e3b7a6bda302c75b4bf7d69dbbba4e341bf6435ddd5bb76e8968b99bfa751c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}