How do you verify what you have is truly silver and not silver plated? It dissolves easily in multiple acids and corrodes over time reacting with ambient air. The only advantage it has over gold is being able to transact in lower amounts since it's worth less.
Discussion
Verification: You can verify by the distinct sound it makes when you drop the coin on a hard surface like a countertop.
Degredation: Yes, as a physical item it can degrade or dissolve in acid and it is subject to the forces of nature but there are still silver coins in existence from the Roman Empire so durability is good enough for most use cases.