{
  "manageEntity": {
    "action": "Save",
    "entityId": "758944",
    "entityType": "Track",
    "nonce": "0x9e88d5f391de736a4065cfdfe0235d6b8996f993feb05aa7c92ffd6db5ca9f21",
    "signature": "0x88eac28cf52a7e350eb43d88ec0344a3861ef6083ba7d86a4e3669615369c75b121a6ab242acc159e3cf4d118527bf7fe9b77aaa35ee41ba76f80d4bc628c7301c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}