{
  "manageEntity": {
    "action": "Save",
    "entityId": "594136583",
    "entityType": "Track",
    "nonce": "0x7fe585b0ebf4a1ce18aceaa3e3e41050010c763d8ee552c9e3f91b3f4f92bb6e",
    "signature": "0xf434a7ae44e10d1a659ddc6fb7f6b6fff9e0d9373506763bb320ba536778c22c08d4a6fc0d23da7259a5632a79f3188f3297318b6b024fa833845b8fef67088d1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}