{
  "manageEntity": {
    "action": "Save",
    "entityId": "73539",
    "entityType": "Track",
    "nonce": "0xe25eb9154db59098e6f8c120e78af39043ba9d926f76cb74b877586f95ce6f04",
    "signature": "0xcf38d2cebc1602153335202e047f27e689fb05c35f7149da74efa55e27a78d3f36fed53f080b7e25edb83e28f3b605b68295522749bbe9a6ec2dcf609613aa781c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}