DIY crypto wallet out of rain drops ☔️

When rain starts - where do you look? 👀

I’ve always been drawn to look down at the street and see how raindrops spread across pavement - marking first watter drop hits on the ground before they cover it all.

Today was no different. When first rain drops hit my head, as usual, I started looking down - but this time, rain had not much concrete to cover apart from lawn and trees, sinse I was walking outside my family’s countryside residence.

Im my world 🗺️

The only concrete in rains posession was a little alley near our house made of perfectly square cement blocks. They obserb rain drops flawelessly, creating a perfectly visible pattern.

The idea of using this natural random generation instantly came to me.
As a square makes a perfect shape to extract data from.

Let’s extract some DATA 📊

A square cement block can be seen as a grid: number by number.
So all we need to do is define the number (grid size) and extract coordinates to work with.

What needs to be done

Instant idea 💡

Was to create a naturally-generated crypto wallet. And the best ratio for this job is 256x256.

1. To generate a wallet mnemonic, 128 bits of entropy are needed (BIP-39).
2. Every coordinate X or Y on a 256×256 grid ranges from 0 to 255 — representing 1 byte = 8 bits.
3. So a pair of (x, y) = 2 bytes = 16 bits of entropy.
4. 128 / 16 = 8 pairs of (x, y) are needed to generate a 12-word seed phrase in BIP-39 standard.

Execution 👨🏻‍💻

I took a picture of a cement square and mapped the rain hits coordinates onto a 256x256 grid using GIMP.

// Coordinates of 8 raindrops on a 256 by 256 square grid
const raindrops = [
  { x: 23, y: 112 },
  { x: 65,  y: 34 },
  { x: 136,  y: 188 },
  { x: 110,   y: 120 },
  { x: 101,  y: 140 },
  { x: 227, y: 180 },
  { x: 144,  y: 38 },
  { x: 228, y: 56 },
];

All that’s left is to use BIP-39 to finish the job;

import { entropyToMnemonic } from 'bip39';

const entropyBytes = Uint8Array.from(raindrops.flatMap(({ x, y }) => [x, y]));
const mnemonic = entropyToMnemonic(Buffer.from(entropyBytes));

console.log("🧠 Mnemonic:", mnemonic); 
// 🧠 Mnemonic: blast link emerge badge shoulder destroy normal organ region license ribbon immense

Feel free to create your own unique wallet using the guide and code above — it’s also available on my GitHub.

NO NEED TO WAIT FOR RAIN: Grab a coloring brush and splash some color onto white paper — random splashes guaranteed 🤝🏼