{
  "manageEntity": {
    "action": "Save",
    "entityId": "1423891338",
    "entityType": "Track",
    "nonce": "0x84f7f1bc637f8911e1b2921e74d2a025ab4762402135c67d2a01e0db9f1f73f0",
    "signature": "0x407ceb96cd5342bbd70dc86cfa368db8912265195f2364a66bd774b41cf9bce11bb824cf6053f2d326930b63e44aaf5d2dbb2cb273a4b0ff3adc442ab4c98fbd1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}