{
  "manageEntity": {
    "action": "Save",
    "entityId": "578842",
    "entityType": "Track",
    "nonce": "0xd3e978f93b876498f917566d25ecd25e85957c29ec4abff750f0662c08dd5661",
    "signature": "0xd32207fce2b803794efbfd0988e0d51f87cf34f4255b842101df8f60c9a31c6b2cec7e6be3db8ec0e3566ec67230351f0bbc7edd4c5c9b63bd6380defce1ab181b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}