[htuovalp] Hash display

Type some text.  A large display with 512 lights displays the binary cryptographic checksum, e.g., SHA-3, of the text as you type it: interactive art.

Blinking lights are pretty.  Design other pretty ways of displaying the checksum.  Perhaps persistence: previous checksums remain visible as scrolling rows or a different color fading away.

Instead of text input, pure bits.  There is no reset or backspace, so the checksum is of the concatenation of everyone who has ever interacted with the art.  This does not require infinite memory.

Previously similar.