jmmemoLÇUnfortunately since memo uses 0-conf, txns w/ fees less than 1 sat/b are insecure. This isn't widely understood. Here's a blog post about it - https://jasonc.me/blog/bitcoin-bip-133-double-spends-bch
https://whatsonchain.com/tx/68ed53201b9ef4a5f2355965055a2aa5801ea455112fbf7e2d4bde5508518f27