{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490055706",
    "entityType": "Track",
    "nonce": "0x1f9933e78112d7d8e4c2b55d06c612ef54ffa195d2edb4f99dbd912ef02db8ee",
    "signature": "0x638e180c6887411c29df4130ed5d501498fae2eb7addaebbd7baa8589140010d151538e242e2daa8fd28c6d15604341706b99152f5ebbf8ae64a35901335d2c61b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}