{
  "manageEntity": {
    "action": "Save",
    "entityId": "357760252",
    "entityType": "Track",
    "nonce": "0x52ab866cfe04a7726d695d2042ad5a9b70b851b436ffd5695c5a0af9d18d0bbf",
    "signature": "0x2f711477849a5ea971ce78e6b1794179db11c5c700f3aa234622fae0144951ce59ac9755d9130ed667c918d6b9473fc65896b2c91bc8b0b69becce90b8d820941b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}