{
  "manageEntity": {
    "action": "Save",
    "entityId": "1499899881",
    "entityType": "Track",
    "nonce": "0xbc2dcc7798e9cfad59e3bb87776113d156550aa33adaa0838d74b4c7d62be75a",
    "signature": "0x174ef7b73452c6adf560e4260b5b466e34364554a36e7c54464c988cad35c5417ad0ee8336ed8bcb03bf21e0ac280be26eb32a65531f312105b9ccc0e9070ee31b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}