Questão jurídica principal
Whether the guaranty satisfied the formal authenticity requirements under federal law and cantonal notarial law.
Decisão extraída
The guaranty was held formally valid; the cantonal court correctly treated the notarized act as meeting the required authentic form.
Fundamentação extraída
Federal law defines the minimum content of authentic form, while cantons regulate the implementing formalities. The appellant did not show any violation of the federal minimum; his objections concerned cantonal implementation, which had already been rejected in the related public-law appeal.