El Salvador moved their 6.274 bitcoins into 14 different wallets in order to prepare for a possible quantum threat in the future.
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What figure is this?
Do you mean 6.274 BTC or 6,274 BTC?
They believe that through this, they are reducing the risks of losing all their bitcoin should quantum threats be real in the future and their holdings get attacked. That is the only reason why El Salvador is moving their bitcoins and I believe this should be something we can all learn from El Salvador. Distributing your bitcoins in more than one wallets will save you in the future and El Salvador knows this.
Keeping your BTC in different wallets as an individual pose more risks to your coins that you have to safe keep different keys and more. I understand the reason El Salvador is doing theirs.