Vanity Address

A vanity address is a Bitcoin address deliberately generated to contain a chosen, human-readable pattern, such as a name, brand, or word, embedded in the encoded characters. Because an address is derived from a public key hash, there is no way to design one directly; instead software generates enormous numbers of random keypairs and keeps only those whose resulting address happens to match the desired prefix or substring.

How they are generated

The work scales exponentially with the length of the target string: a few matching characters are trivial, but each additional character multiplies the search space, so long patterns can demand specialized GPU effort. Bech32 and legacy addresses use different character sets, so a pattern feasible in one format may be impossible in another. Crucially, every candidate keypair must be tested locally, and only the winning private key is retained.

Security considerations

The safest practice is to generate vanity addresses yourself on a trusted, offline machine, because whoever produces the keypair can spend the funds. Outsourced generation should never hand over a full private key. A split-key approach lets a third party search for the pattern using only a public-key offset, then you combine their result with your own secret so the searcher never learns the spending key. Reusing a vanity address across many payments harms privacy by linking transactions to one identity.

For the linkage risks of repeated use see Address Reuse, and for a privacy-preserving alternative to publishing a fixed address see Silent Payments.