{
  "manageEntity": {
    "action": "Save",
    "entityId": "623053210",
    "entityType": "Track",
    "nonce": "0xce5a50928a7589a57f92488095b91b3db8089aacb799a5689503ebad861213d1",
    "signature": "0xfbb1286476c3b2a405f8eb7cab3997464b150dfe20d9dc5ff2993a319265cead12214820aede517337de7a1940146a318423650477a4f295bc0e25394c9ea0ac1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}