{
  "manageEntity": {
    "action": "Save",
    "entityId": "1941649816",
    "entityType": "Track",
    "nonce": "0x254d23af34128b7855ffc7bb888d45be21f8296fbddeca810509608e9596695f",
    "signature": "0xcdc8964ca3bae2b101632191c5827b67758c160cfa7937e0747066aa4ecfaa3422b298980a07d77b5f1f823043edb9d0e911779c6ada5dae047b910e95b764b51c",
    "signer": "0x39BbEb25924EFA2144235AA6b9287C30dA0bEF8D",
    "userId": "320790987"
  }
}