I know this is going to be embarrassing as a project lead but I wanted to share a scam that can get you if you're tired and not at your best and shows the huge UX issue that can happen with BTC.
User sends first confirmation bitcoin and it confirms, you send the coins /1 #BTC
User sends first confirmation bitcoin and it confirms, you send the coins /1 #BTC
All the while you're on a call with the person, he sends the second batch of Bitcoin, the amount shows on your Trezor (the new Suite UI) and he starts hurrying you. What you don't notice is that it's with a low fee and will take hours to confirm. /2
You send the coins, then he double spends the Bitcoin placing a higher fee and he gets his Bitcoin back. After being used to having quick transactions in ETH/SOL/AVAX and InstantSend locked transactions in FIRO that can't be double spent, I forgot about this /3
Yes I know I'm an idiot and it's an extremely expensive lesson but I think it's important esp as we get complacent with quick L1s that we get lax with Bitcoin. Don't be me. /4.
You can check out the double spent tx here: blockchain.com/btc/tx/1059bfd…
This is how the UI looked like on Trezor Suite. The total had gone up so I had thought it was in and not just waiting confirmation. My window wasn't complete maximized but should have double checked. 
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