Trading Notes | Hash Functions
① A secure hash function makes it nearly impossible to recover the original input from its hash, and nearly impossible to find two different inputs with the same hash.
② Bitcoin uses SHA-256 to calculate block hashes and transaction IDs, and hashes twice in a row (double SHA-256).
③ To look up a transfer, search for its transaction hash in a block explorer—it’s much more reliable than looking at a screenshot someone else posted.
$BTC 81043.51 (-0.27%)
① A secure hash function makes it nearly impossible to recover the original input from its hash, and nearly impossible to find two different inputs with the same hash.
② Bitcoin uses SHA-256 to calculate block hashes and transaction IDs, and hashes twice in a row (double SHA-256).
③ To look up a transfer, search for its transaction hash in a block explorer—it’s much more reliable than looking at a screenshot someone else posted.
$BTC 81043.51 (-0.27%)