Minecraft Hardcore World Record Mobile
Iceboat doesn’t work anymore because it’s a 9 eye on the newest update. But next update will bring a new fastest seed. The trial seed: 542491775383969368 on works on 1.21.50+
This seed which I found on a list is almost as fast as the ice boat but like 5-10 seconds slower. At least on mobile. Hardcore seed: 5091569226608877144
This run was pretty good. But I was scared of the fire at the end so it could have been sub 3.