B32 is shorthand for the bech32 address format, defined in BIP-173. It encodes addresses using lower-case alphanumeric characters and includes built-in error detection. If you’ve seen addresses that begin with “bc1,” you’re looking at bech32—or B32 if you prefer the nickname.

These addresses cut down on typing mistakes and are more QR code-friendly than legacy formats. They’re part of the broader SegWit upgrade, which also helped reduce transaction fees and paved the way for further protocol improvements. So, B32 addresses are not just a style choice; they’re a more efficient and secure format for sending and receiving Bitcoin.