Using it, theoretically, is just like using a debit card
Actually, using it is exactly like using a debit card because that is what some exchanges offer. Coinbase, for example, issues Visa debit cards that draw from whichever crypto the holder specifies. Individual transactions are converted to the purchase currency and settled by Coinbase using what amounts to a a good faith model similar to a brokerage, so they don’t need to wait for the blockchain to confirm.
The fees are outrageous, so using a BTC account to fund daily shopping doesn’t make a lot of sense.
Long term I don’t see BTC being used as a daily currency. Something like Chainlink, if they’ve really solved the oracle problem, would have a huge impact on the derivatives transactions. They’d settle in minutes rather than days.
