Trait packs and traits will be deployed on ETH mainnet, as ERC1155 contracts. The transactions such as opening packs and applying traits are free/gas only, so be sure to pick times with low gwei.

source: https://medium.com/@nprussell/punks2023-phase-2-66bec97b055e

There will be one ERC1155 contract for ALL of our packs, meaning Trait Packs 1, 2 and 3 will all be pushed under the same contract. Trait packs are tradeable/saleable unopened, but burned upon use.

The contract has been developed to allow us flexibility in how we drop packs now and in the future. We can modify how many traits per pack, the price per pack, total supply (allowing for more limited pack releases), and set specific packs to be claimable for free by punks.

There will be 10,000 (one for each punk) free trait packs for trait pack 1, claimable for just the cost of gas. These will not expire and do not affect the overall supply. If you don’t claim your trait pack for your punk, then sell the punk, the new owner will be able to claim.

Again, there will be only one ERC1155 contract for ALL of our traits. The only way to mint a trait is through burning (opening) a pack. Traits are tradeable/saleable only until they have been applied to a Punk.

Trait randomisation is determined on-chain, and is pseudo-random. What that means is, we will assign each trait a “weighting”. These numbers are purely examples, but a common trait might have a weighting of 300, and a rare might have a weighting of 3. So you’re 100x more likely in this example to mint a common. While this does mean we do not get control over the exact number of each trait that is minted, it does mean it is provably fair.

When you apply a trait to a punk, you burn the trait (NFT). The trait remains assigned to that punk off-chain and can be added and removed at any time. It cannot, however, be transferred or sold as a trait once used. If you sell or transfer the punk itself, the trait will follow it to the next owner, potentially increasing the desirability of your punk.

When you apply traits, your punk’s trait metadata WILL NOT CHANGE on marketplaces such as Opensea, but the image will. We made this decision so as not to affect rankings, thus harming people buying the highest ranked punks. If we decide to go down the route of building our own marketplace, this will allow us MUCH more freedom in terms of displaying these new traits as part of the browsing/buying process. This is something already under consideration.

When you apply a custom trait to your Punk, the default image on the marketplaces will change, and you’ll have a new Aqua coloured background to represent the change. This Aqua coloured image will become the default in Opensea, but you’ll be able to flip between the two images with a small icon in the corner. This means when buying Punks2023 on Opensea, you’ll easily be able to tell apart a modified Punk vs a clean punk with no trait customisations. The one exception to this is if you apply a new background trait (which are included in trait packs).

Our traits use a Z-Index system. If you’re not familiar with what that is, it’s simply a value we assign to each trait to determine the stacking order of overlapping traits. This gives us a lot of control to ensure we have no trait clashes.

Traits will be divided into 3 categories:

There will be around 12 trait skins available in each trait pack, until every trait has more than one variation.

UNISEX BIKER GANG TRAIT

“MALE PATTERN BALDNESS” — GENDER LOCKED

In addition to these 3 trait types, traits will either be STATIC or ANIMATED. Please note that VERY few traits will be animated, as we don’t want the collection to be an eye-sore. These animated traits such as the GOLD HOODIE, will be extremely rare.