{
  "manageEntity": {
    "action": "Save",
    "entityId": "1907448598",
    "entityType": "Track",
    "nonce": "0x5499c84571aa666f668a010121f63f56c6b96a64b5190f67f9a45b96e66698ff",
    "signature": "0x4470f75cdd228558a586783289abcc741dc418088408fb588ab4599849de8b4e6983399033f2b31a6f7dab6c0013516c459f1345e738763026d34485ddfdea6b1b",
    "signer": "0x5A6DCd6E22135e4225594900c17114A7dAD01964",
    "userId": "580576096"
  }
}