Open source alternatives to privy

The author, who runs the Ethereum-based social news site Kiwi News, is seeking open-source alternatives to embedded-wallet services like Privy, Web3Auth and Dynamic, because syncing temporary posting keys across devices is needed to improve engagement but handing key custody to a third party creates lock-in risk. Kiwi News currently stores temporary keys in local storage and delegates them on Optimism, and the author says asking users to send multiple delegation transactions causes drop-off. The author tried Passkeys with the largeBlob extension, but reported poor browser and OS support, including no support for Chromium-based browsers, and said fixes could take years. The post asks the community for self-administrable alternatives that would let users keep control of their keys.