Two days into Tokyo Comic Market, it's good to see more doujin circles accepting #crypto and taking advantage of technology for payments. That said, there are a lot of stumbling blocks that prevent it from being too slow and unwieldy. A crowded venue like Big Sight will always have mobile network congestion, which interferes with speedy confirmation. But worse, a lack of prep can add needless obstacles to the transaction. I was given a QR for a wallet and an amount in BTC. My wallet is auto set to mBTC to avoid ridiculous decimals. I mistakenly entered the BTC number given unthinkingly, which the wallet interpreted as an unacceptably low volume of mBTC. This could have been avoided with a payment request QR, that most wallets offer. Every little difficulty, or any delay of even a handful of seconds discourages crypto use for smoother, faster centralized alternatives. Or good old cash, of course. A little forward thinking and preparation is a must. Vendors beware!