{
  "manageEntity": {
    "action": "Save",
    "entityId": "404516061",
    "entityType": "Track",
    "nonce": "0xd6d75987edbedff1bf5198160105cd178fefe1f3899dfc4ac6b3b962a2f0444c",
    "signature": "0x7eaf9d19b9b5aa599831e8d69ed0336df60035ac03149d74d2293c63ad16d4e94ee51b2cc7304e3c2bfafef39f92242cd1a94a79d744bb8caa1d91ecb8c1f7da1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}