{
  "manageEntity": {
    "action": "Save",
    "entityId": "1448317059",
    "entityType": "Track",
    "nonce": "0xc8f6a7512c502f8212c1618ef20d195ae01773f0128b7190081c6f6689b754f4",
    "signature": "0x727c7921c57617ad61ef1d433426e9985c03a3152113305c8be39a7940ce7a7b050be4d9939a1f0e0e4fcf985cd32238cf002c544cc8d49ef4b16e0aba9a21221c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}