Simple Turtle egg gold XP farm

A gold and XP farm built around zombie piglins trampling a turtle egg, which walks them into a nether portal and funnels them to a kill chamber on the nether roof. It goes from level 0 to 30 in about a minute and makes roughly 360 gold blocks an hour. Under 25 minutes to build and almost no materials. Java only.

Do not light or walk through the spawning area portal until the rest of the farm is finished. Since 1.21 mobs can generate portals themselves, and the link comes out wrong.
On 1.21 and up, build the overworld bridge floor from magma blocks so chicken jockeys die before crossing. Otherwise they glitch out of the kill chamber.
Put a dispenser with a lava bucket at mob foot level behind the chest on a button, to burn the piled up swords and rotten flesh and cut the lag.
Replace the bottom glass of the kill chamber with obsidian. One misclick breaks glass and baby piglins get out.
Magma blocks on the spawn floors stop ordinary piglins spawning there, which raises the rate.
It can be run AFK. Hit one piglin so they aggro, the aggro spreads to the rest, and mob cramming kills them while still dropping XP.