{
  "manageEntity": {
    "action": "Save",
    "entityId": "337404",
    "entityType": "Track",
    "nonce": "0x2f14b01f288c00fa5993b772fb6c8edb740e8b8fecd006e3709c40cc40a6e542",
    "signature": "0x5a19acc880487e2971102ce3a44ef0b6ff6659397a902981521a5a75b891d8373eb38bb25417c9d77e64ef0984f5859773abacf4326dbb329ca6cf9913ce6ebc1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}