Very unsecure app besides. Only store small amounts of Bitcoin in WoS.

There are currently no lightning wallets with good security AFAIK.

For a secure, non-lightning light mobile wallet I use Edge wallet. I just move small amounts of Bitcoin from my Edge wallet to WoS as needed.

Edge stores your keys in an encrypted file that is backed up to their servers. It can only be decrypted on your phone using your passphrase.

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I wouldn’t trust my keys on someone else’s server.

It's just encrypted gibberish without the passphrase. Since there's no character limit on the passphrase you can use a 140 character long phrase. Unbreakable.

You could encrypt your private keys and publicly publish them on the Bitcoin blockchain in an ordinal and it wouldn't matter.

Never heard of Edge is it open source? How do you know there isn’t a back door?

It's not open source but it is technically non-custodial.

https://edgeapp.zendesk.com/hc/en-us/articles/7019703449115-Edge-White-Paper

There was a security vulnerability recently back that they had to fix:

https://edge.app/blog/company-news/edge-security-incident-urgent-notice/?af=google-com

I prefer open source projects

Open source plus popular means most eyes on the code equals most secure.