{
  "manageEntity": {
    "action": "Save",
    "entityId": "1728575793",
    "entityType": "Track",
    "nonce": "0x565a3cdf303fa5af2b39dbdb6fe1aa4df0bae48ff0b1e85cb1eb7c9967b8b696",
    "signature": "0x3ac521bf9e6504e457259cc8b5fd7925932e2d6565c0743547cf0509ad41516868225c22b39143208c1dcd353d4e553a052bac8cdbdd5b025ed0ea0b85baeff71b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}