{
  "manageEntity": {
    "action": "Save",
    "entityId": "325402",
    "entityType": "Track",
    "nonce": "0x8884c6182b7811855dde602cdcf6c60ac0d9e81503d5ede20188ac6b07bd871a",
    "signature": "0x3a1ccc5441cd258a1f1441b50701fdae1514b363c9bad93003849a56da400ab511ac73df986607e5719945247abbc590227bb5b28195611e73f75118168731c81c",
    "signer": "0x0E71C12c426F5C9206F778713f48B60477CA943b",
    "userId": "29088079"
  }
}