claves

Imagine someone sends you 5 BTC.
We already know that amount can be represented by one or more UTXOs... But now a fundamental question arises...
IF UTXOs ARE PUBLIC DATA, WHY CAN’T ANYONE SPEND THEM?
Because each output has specific conditions that must be met to use its value.
And here comes something very important: THOSE CONDITIONS ARE SET WHEN THE OUTPUT IS CREATED, NOT WHEN SOMEONE TRIES TO SPEND IT...
Let’s take it step by step.
HOW IS A UTXO LINKED TO A SPECIFIC KEY?

BEFORE WE CONTINUE... THERE'S SOMETHING EXTRAORDINARY WE NEED TO UNDERSTAND ABOUT BITCOIN....
We already know that to use certain bitcoins, we must prove that we're authorized to spend them.
But how can we prove that authorization without revealing our personal data or giving the network secret information?
THE ANSWER LIES IN TWO FUNDAMENTAL ELEMENTS: THE PRIVATE KEY AND THE PUBLIC KEY.
And the most interesting thing is that they work together, even though they serve completely different functions....