Editing Wallet (section)

===20th century–present===
[[File:Wallet (AM 613844).jpg|thumb|right|200px|A WW I era wallet and its contents]]
The modern bi-fold wallet with multiple "card slots" became standardized in the early 1950s with the introduction of the first [[credit card]]s. Some innovations include the introduction of the [[velcro]]-closure wallet in the 1970s. Pocket-sized wallets remain popular to this day.<ref>{{Cite web |date=2019-02-20 |title=A Brief History of Wallets and The People Who Own Them |url=https://bravesoles.life/blogs/news/a-brief-history-of-wallets-and-the-people-who-own-them |access-date=2023-05-18 |website=Brave Soles Life |language=en |archive-date=2023-05-18 |archive-url=https://web.archive.org/web/20230518014502/https://bravesoles.life/blogs/news/a-brief-history-of-wallets-and-the-people-who-own-them |url-status=dead }}</ref>

For [[cryptocurrency|cryptocurrencies]] that only exist in cyberspace as entries in some online ledger, a [[cryptocurrency wallet]] is a computing tool whose purpose is to securely keep the owner’s secret key, to authenticate the owner, and to let the owner sign transactions securely. A "hardware wallet" is a single purpose computer to do this even more safely.