How Does Double-Spending Fundamentally Undermine a Cryptocurrency’s Value Proposition?

Double-spending violates the core principle of digital scarcity, which is the fundamental value proposition of most cryptocurrencies. The ability to spend the same coin twice destroys the trust in the immutability of the ledger.

If a transaction cannot be definitively confirmed as final, the currency loses its utility as a reliable medium of exchange and store of value. This loss of trust inevitably leads to a collapse in market price and network abandonment.