Bech32m
Bech32m is a modified version of the Bech32 encoding scheme, which is used to encode SegWit addresses.
Bech32m is a modified version of the Bech32 encoding scheme, which is used to encode SegWit addresses. Bech32m is nearly identical to Bech32: it is an encoding scheme with 32 characters; it uses only lowercase letters; and it begins with a human readable part, which is ‘bc1’ for SegWit addresses. Bech32 has an error detection mechanism built in, which is meant to detect alterations to Bech32-encoded data.
However, the original Bech32 implementation had a vulnerability in this mechanism, allowing an attacker to change an address without invalidating the checksum. When a Bech32 string ends with a “p”, adding or removing “q"s before the “p” does not invalidate it. Bech32m removes this vulnerability by changing a constant used in the encoding scheme, and is thus more secure.
As specified in BIP 350, Bech32m is proposed as the encoding scheme for SegWit version 1 (Taproot) addresses, which will be introduced by the Taproot upgrade.
Bech32m is a concept relevant to Bitcoin, finance, or blockchain technology that investors should understand. Onramp's comprehensive Bitcoin glossary provides clear explanations of Bech32m and hundreds of other terms to support informed investment decisions.
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