  Crypto wallets are a key touch-point for cryptocurrency use. People use
crypto wallets to make transactions, manage crypto assets, and interact with
decentralized apps (dApps). However, as is often the case with emergent
technologies, little attention has been paid to understanding and improving
accessibility barriers in crypto wallet software. We present a series of user
studies that explored how both blind and sighted individuals use MetaMask, one
of the most popular non-custodial crypto wallets. We uncovered inter-related
accessibility, learnability, and security issues with MetaMask. We also report
on an iterative redesign of MetaMask to make it more accessible for blind
users. This process involved multiple evaluations with 44 novice crypto wallet
users, including 20 sighted users, 23 blind users, and one user with low
vision. Our study results show notable improvements for accessibility after two
rounds of design iterations. Based on the results, we discuss design
implications for creating more accessible and secure crypto wallets for blind
users.
