> Blocks will need to be ~5TB to match Visa transaction volume. No, it's on the order of 3 gigabytes. Visa claims they can handle up to 25k Tx/s. 226 B / Tx.

> Blocks will need to be ~5TB to match Visa transaction volume. No, it's on the order of 3 gigabytes. Visa claims they can handle up to 25k Tx/s. 226 B / Tx. 600 sec (10 min) per block. (25000 Tx / s)(226 B / Tx)(600 s / block) = 3.39 • 10^9 B / block Visa normally handled around 2k Tx/s, which would only require a few hundred megabytes per block.