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Crypto
Double Spend
Trying to spend the same crypto coins more than once — the big problem blockchains were invented to solve.
The whole point of Proof of Work and Proof of Stake is to prevent double spends. That's why you wait for confirmations on big payments.It's like writing two checks for the same $100 when you only have $50 in the bank and hoping both clear.
Real world: Before Bitcoin, digital money could be copied and spent twice, but blockchain makes double spends almost impossible once a transaction is confirmed.
💡 Double spends are basically impossible on healthy blockchains — this is the core reason crypto can work without banks.