I am the official currency of a landlocked nation in South America, known for its Andean peaks and vibrant indigenous culture. My name is derived from a term meaning 'silver'. I was once pegged to the US dollar and have experienced periods of hyperinflation. Which currency am I?

1. My country's capital is Sucre, although La Paz is the seat of government.
2. My value has fluctuated significantly throughout history.
3. I'm not used in Brazil, Argentina, or Peru.
4. My symbol is 'Bs'.