{
  "manageEntity": {
    "action": "Save",
    "entityId": "921993095",
    "entityType": "Track",
    "nonce": "0x10bd4a3bcc0c490c1c36e1f38a46cf955c23530c19ede9f72c01309b35bf4292",
    "signature": "0x6efe22751c71c32f72156b42e293960ff4cc3d5ec09c5a93bdd2f775c8fc572108a448afd851ffecb088093dd72851472407eae9bc72948800ee9692cc3fe32c1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}