Explore how to generate a pseudo-random noun, fully on-chain, with just two contract calls.

Overview

The traits of nouns are determined by a Seed . To generate an on-chain image of a noun, we will first generate a seed using the NounSeeder contract. Once we have our seed, we will then generate our noun image using the NounsDescriptor contract.

Generate a Seed

The NounsSeeder contract is in charge of generating Noun seeds. The contract has a generateSeed function that accepts two arguments: nounId and INounsDescriptor .

  • nounId can be any valid uint256.
  • INounsDescriptor is the address of the NounDescriptor contract.
function generateSeed(uint256 nounId, INounsDescriptor descriptor) external view returns (Seed memory);

The Seed is a list of part ids that determine the noun traits. It can be randomly generated using the NounSeeder contract or specified directly if you know which parts you want. Pseudo-random generation happens using the pending block's blockhash and passed in nounId.

A successful call will return a Seed with random traits:

struct Seed {
    uint48 background;
    uint48 body;
    uint48 accessory;
    uint48 head;
    uint48 glasses;
}

Using your favorite web3 library, call the NounSeeder contract passing an arbitrary nounId and the NounDescriptor address as arguments.

const nounId = 1234;
const nounDescriptor = "0x0Cfdb3Ba1694c2bb2CFACB0339ad7b1Ae5932B63";
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To make sure we get different Seed on every call, be sure to change the nounId on e every call as the blockhash will remain the same while the block is being mined (~15s).

Generate the Noun image

The NounsDescriptor contract is used to store/render Noun artwork. We will use it to generate an .svg image from our Seed.

function generateSVGImage(INounsSeeder.Seed memory seed) external view returns (string memory);

Using our Seed from step one, we can call the function as follows:

const nounId = 1234;
const nounDescriptor = "0x0Cfdb3Ba1694c2bb2CFACB0339ad7b1Ae5932B63";
const seed = await nounSeederContract.generateSeed(nounId, nounDescriptor);

A successful response will return a base64 encoded string representing the .svg image of the noun determined by the Seed:

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y="300" fill="#a3efd0" /><rect width="20" height="10" x="160" y="300" fill="#a3efd0" /><rect width="10" height="10" x="150" y="20" fill="#a3baed" /><rect width="10" height="10" x="140" y="30" fill="#a3baed" /><rect width="10" height="10" x="80" y="40" fill="#67b1e3" /><rect width="10" height="10" x="150" y="40" fill="#a3baed" /><rect width="10" height="10" x="200" y="40" fill="#71bde4" /><rect width="10" height="10" x="70" y="50" fill="#67b1e3" /><rect width="10" height="10" x="110" y="50" fill="#a3baed" /><rect width="30" height="10" x="140" y="50" fill="#a3baed" /><rect width="10" height="10" x="170" y="50" fill="#71bde4" /><rect width="20" height="10" x="190" y="50" fill="#71bde4" /><rect width="20" height="10" x="80" y="60" fill="#67b1e3" /><rect width="20" height="10" x="120" y="60" fill="#a3baed" /><rect width="10" height="10" x="140" y="60" fill="#67b1e3" /><rect width="20" height="10" x="150" y="60" fill="#a3baed" /><rect width="30" height="10" x="170" y="60" fill="#71bde4" 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We can then decode the string to get our .svg image:

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Tada!
Tada!

Review a working example in the CodeSandbox below:

Summary

With just two contract calls we were able to generate a fully on-chain noun! We called the NounSeeder contract to generate a random Seed (which determines the traits of our noun). We then passed the Seed into the NounDescriptor contract to generate the the .svg image.

 

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To view the source code, visit the Github repository.
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Learn more about our smart contract architecture:
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Join the community - we'd love to hear what you are building! discord.gg/nouns
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