{
  "manageEntity": {
    "action": "Save",
    "entityId": "1972871698",
    "entityType": "Track",
    "nonce": "0xcaea22e97be5fa65115443aa04f10cbcc9fbe5200b539bc1fdb20af5e6dcee92",
    "signature": "0x9d2ad77af65c992711a80b6e3da47f78d2ecd1e102dd49d430e77c22fb2d2c2967c0a9bac3c3f420bfaf5237395166c9821e840a7e58f15e1404074d15ef33e51c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}