Sign one message four ways

ECDSA secures nearly every wallet today, and a large enough quantum computer breaks it. Sign the same text with ECDSA and three post-quantum schemes, with real keys in your browser, and see what the safety costs in bytes and time.

Read the essay

fig. 01 / signatures point at a stack rest

Sign and compare

Pick or type a message, sign it four ways, then flip a byte or edit the text and watch verification fail.

Fill a block

Bigger signatures mean fewer transactions per block. Pick a scheme and a load and count the blocks it takes.

When does ECDSA break?

Three assumptions decide the date. Move them and see how much the answer swings.