{
  "manageEntity": {
    "action": "Save",
    "entityId": "1961857475",
    "entityType": "Track",
    "nonce": "0xf0290de9875d8adb38adcf164347cde83c11f64ff879c486255d3059f58b9859",
    "signature": "0x036c300213c86dc1d366e4241e5293e3219882e956ccbb69faca05ae3201d1500f18fec835477f04c98e077473d0eb27954585ae6e58f55d163543272e85deab1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}