Where does that long string of characters called a transaction hash (TxID) come from?
When checking a transfer, searching for its transaction hash in a block explorer is much more reliable than looking through screenshots someone else sent you.
In fact, each block header records the hash of the previous block. Changing any historical block changes its hash, so all subsequent blocks will no longer match.
Mining $BTC is essentially an ongoing process of calculating SHA-256 hashes to find a result that meets the difficulty requirements.
When checking a transfer, searching for its transaction hash in a block explorer is much more reliable than looking through screenshots someone else sent you.
In fact, each block header records the hash of the previous block. Changing any historical block changes its hash, so all subsequent blocks will no longer match.
Mining $BTC is essentially an ongoing process of calculating SHA-256 hashes to find a result that meets the difficulty requirements.
