{
  "manageEntity": {
    "action": "Save",
    "entityId": "21363335",
    "entityType": "Track",
    "nonce": "0xb523da72a88e16c0d12505e0a789db1e9d35dc8eea8eb253e341d1290ac99e90",
    "signature": "0xbbe8efd5c25edfa4fb990959043f224be9ddee61cab1d6dd688a9dfdb21f35a63f3d221d0ce483b6f2f67bb0e88fb8b348723da5cec1f8d6962169877ec5d4c11c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}