Definition:
It's a document which states that the State Treasury is a debtor of these securities and is obliged to make payment or non-payment execution.

The State Treasury is responsible for the obligations arising from the securities it issued with all its assets.

Source:

• Act of 27 August 2009 on the Public Finance
  Place of publication: (Dz. U. z 2022 r. poz. 1634, z późn. zm.)