ICPunks

ICPunks is a project to bring an analogue ERC-721 to Dfinity in order to faciliate creation of NFTs. This repository introduces NFT canisters by showing an implementation - ICPunks - a collection of 10,000 Dfinity punks, which will be available for free to claim by community.

In the current version 0.0.2, you’ll be able to compile the local copy of ICPunks together with Dfinity network and frontend running locally. Follow setup instructions below to run it.

This project is sponsored by the Dfinity Developer Grant Programme.

ICPunks main token canister was written in Rust, there were several reasons for changing from Motoko to Rust:

1. Currently Rust offers more different packages, this enables more functionality. Especially generating account id from principal.
2. Most of the code of IC is currently written in rust.
3. Checking the ability to make calls between canisters written in different languages.

Installation

Prerequisites

• Internet Computer SDK
• Node.js, version >= 12
• Yarn
• Python
• [email protected]
• Rustup

Setup

The first step to setup ICPunks locally is to clone this git repository:

$ git clone [email protected]:stopak/ICPunks.git
$ cd ICPunks

If you don't have vessel yet you can install it by running an install script included in this project:

# Install vessel
$ ./scripts/vessel-install.sh

Double-check you have vessel installed at version 0.6.*, then clone this repository and navigate to the ICPunks directory

$ vessel --version
# vessel 0.6.0

Install all dependencies for UI

yarn # <- This installs packages from the lockfile for consistency

Install target wasm32-unknown-unknown for rust

rustup target add wasm32-unknown-unknown

Start a local Internet Computer replica.

$ dfx start --clean --background

Execute the following commands in another terminal tab in the same directory. (If you want to use internet-identity, skip this instruction and go to How to install local identity)

./scripts/local_deploy.sh

This will deploy a local canister called icpunks_assets. To open the front-end, get the asset canister id by running dfx canister id icpunks_assets. Then open your browser, and navigate to http://<icpunks_assets-canister-id>.localhost:8000.

Frontend Development

To run a development server with fast refreshing and hot-reloading, you can use this command in the app's root directory:

$ yarn run start

Your default browser will open (or focus) a tab at localhost:3000.

Now you can make changes to any frontend code and see instant updates, in many cases not even requiring a page refresh, so UI state is preserved between changes. Occasionally adding a CSS rule won't trigger an update, and the user has to manually refresh to see those changes.

Internet Identity Locally

Clone and setup the project and make sure that internet_identity is deployed, and you have the front-end available. That should allow you to do auth locally to try out the new Internet Identity service. For production, we will probably configure identity.ic0.app to be running this canister, but for now this is how to get it running.

In order to install II start replica in ICPunks, then go to II project, build it and deploy.

How to install local identity

in ICPunks clean local replica

dfx stop
dfx start --clean --background

cd ..
git clone https://github.com/dfinity/internet-identity.git
cd internet-identity

Replica data in internet-identity cloned repo must also be cleaned (otherwise there will be errors during deployment). Replace $internet_identity with your local path to cloned repo

rm -r .dfx/local

Deploy internet-identity canister to ICPunks replica

II_ENV=development dfx deploy --no-wallet --argument '(null)'

Copy canister_ids.json from internet-identity replica to ICPunks replica

cp ./.dfx/local/canister_ids.json ../icpunks/.dfx/local/canister_ids.json

Now deploy ICPunks canisters

cd ../icpunks
dfx deploy

Minting and claiming

In the opposition to usual ERC 721 minting, ICPunks use pre-minted tokens. It is required due to the fact that images and metadata are stored in contract, instead of IPFS. In order to make it possible for people to claim tokens, separate claiming canister was created (creating new canisters is rather cheap, especially in comparison to ETH). It was decided that it is not required to insert all functionality in to one canister, hence we have following canisters:

icpunks - actual tokens, with listing functionality icpunks_storage - ledger for icpunks, stores all defined events: mint, transfer, purchase, list, delist icpunks_claim - claiming for icpunks, initially all tokens are owned by this canister

Tools

All js scripts utilize Ed25519KeyIdentity key stored in file key.json, NEVER share this file with anyone, DO NOT upload this file to github. Those are the keys to your kingdom.

generate_key.js

Generates key.json with randomly selected principal. DO NOT SHARE key.json with anyone.

mint.js

Used for minting tokens in canister, first 100 tokens are given to specified principal (change it or you will loose your tokens!). In order to make the process faster utilizes multi_mint function (can mint several tokens at once). Due to limitation of 2mb upload it calculates how many tokens at once it can mint. Minting of 10 000 tokens took about 1h 20m.

test.js

Used for minting 52 tokens on local replica. Has additional functions for testing output from canister

Scripts

local_deploy.sh

Deploys canisters locally, dfx deploy will not work as there are more steps involved in setting up the canisters:

1. Token canister requires startup parameters
2. Adding genesis record to ledger
3. Pointing token canister to ledger canister (storage)
4. Pointing storage canister to token canister

network_deploy.sh

Similar to local_deploy.sh however deploys to ic network. Use with caution!

Issues and Remarks

Here, we gathered various problems we expect to solve while working on the next versions of the ICPunks. Feel free to let us know what you think!

In short:

• Wallet Canister that can display NFTs and "ERC20" tokens: how to efficiently store 1000 images, (propably one large image) tried to make canister with 100 images, build takes forever
• In the long run, how we/users should pay for cycles required to upkeep token.

Upkeep, Transaction History

How to handle growing costs of containers upkeep. We need to pay not only for execution but also for data storage, which will increase overtime. If not handled properly it will couse the whole token to be not sustainable in the long run.

How to deal with long transaction history

Current canisters have limit on amount of data of 4gb. If we reach more data than that (ETH currently is about 300GB) we need to spawn new containers which incurs additional running costs

Inter-Canister Calls (required for marketplaces, DeFI and others)

The following issues are related to calls between different canisters, and we leave them here as open questions:

• Identity of Inter-Canister Calls: who is the actual sender, can we check that call was made by canister instead of user, what identity is used by calling canister?
• What happens when inter-canister call fails?
• How to prevent canister updates (we are keeping users' data, so it must be protected)?
• How to ensure atomicity of transaction that span multiple canisters?