{
  "manageEntity": {
    "action": "Save",
    "entityId": "388938",
    "entityType": "Track",
    "nonce": "0x60e887b8c1ae8dc83a426f51dc9186f1df933bf64a9afb17e973be79513eccab",
    "signature": "0xabde5ece1d451fe4213e5d315c6137bfc6f4b44c4a2ff23bb2ca1fad9cb5eff97da8855406ebcc4c8b20aabfdac2fa4e083f46cf9daebb30a39e27c6bf425be11c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}