{
  "manageEntity": {
    "action": "Save",
    "entityId": "303102558",
    "entityType": "Track",
    "nonce": "0xbf3d53d2fc6e75a673ddb6dda933dbe411f5625b00c307ed628dc7127b154f77",
    "signature": "0xefd91cc76ddcc962a045ecbbc55a3571de8a0827bdd1f6b3bae976e8d19faf08089d150bc24072bac0991cc3245f55a67ad413073e914a5291dbbc08547d47bf1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}