COTI V2 Confidentiality Preserving L2 | SDKs and Examples

All repositories specified below contain smart contracts that implement confidentiality features using the COTI V2 protocol. The contracts provide examples for various use cases, such as Non-Fungible Tokens (NFTs), ERC20 tokens, Auction, and Identity management.

These contracts demonstrate how to leverage the confidentiality features of the COTI V2 protocol to enhance privacy and security in decentralized applications. The contracts are of Solidity and can be compiled and deployed using popular development tools like Hardhat and Foundry (Work in progress).

Important Links:

Docs | Devnet Explorer | Discord | Faucet

Interact with the network using any of the following:

1. Python SDK | Python SDK Examples
2. Typescript SDK | Typescript SDK Examples
3. Hardhat Dev Environment

The following contracts are available in each of the packages:

Contract		python sdk	hardhat sdk	typescript sdk	Contract Description
AccountOnboard	deployment	✅ *	✅	❌	Onboard a EOA account - During onboard network creates AES unique for that EOA which is used for decrypting values sent back from the network
AccountOnboard	execution	✅	✅	✅	"
ERC20Example	deployment	✅	✅	❌	Confidential ERC20 - deploy and transfer encrypted amount of funds
ERC20Example	execution	✅	✅	✅	"
NFTExample	deployment	❌	✅	❌	Confidential NFT example - saving encrypted data
NFTExample	execution	❌	✅	❌	"
ConfidentialAuction	deployment	❌	✅	❌	Confidential auction - encrypted bid amount
ConfidentialAuction	execution	❌	✅	❌	"
ConfidentialIdentityRegistry	deployment	❌	✅	❌	Confidential Identity Registry - Encrypted identity data
ConfidentialIdentityRegistry	execution	❌	✅	❌	"
DataOnChain	deployment	✅	❌	❌	Basic encryption and decryption - Good place to start explorining network capabilties
DataOnChain	execution	✅	❌	✅	"
Precompile	deployment	✅	✅	❌	Thorough examples of the precompile functionality
Precompile	execution	✅	✅	❌	"

(*) no deployment needed (system contract)

Note

Due to the nature of ongoing development, future version might break existing functionality

Faucet

🤖 To request devnet/testnet funds use our faucet

COTI v2 Typescript SDK Examples

Note

Please refer to the latest tags to find the most stable version to use.

Examples that described above resides in [coti-sdk-typescript/src/examples], the solidity contracts are in the confidentiality-contracts repo that is imported as a git submodule.

The following examples are available for execution:

Contract	Contract Description
AccountOnboard	Onboard a EOA account - During onboard network creates AES unique for that EOA which is used for decrypting values sent back from the network
ERC20Example	Confidential ERC20 - deploy and transfer encrypted amount of funds
DataOnChain	Basic encryption and decryption - Good place to start explorining network capabilties

Usage

1. Clone the Typescript examples repo along with its submodules into your desired location

   git clone --recurse-submodules https://github.com/coti-io/coti-sdk-typescript-examples.git

2. Change directory to the newly create one

   cd coti-sdk-typescript-examples

3. Install dependencies

   yarn

Note

Ensure your environment meets all the pre-requisites. Visit the pre-requisites section of the readme.

ERC20

The following process will help you run the erc20.ts example from the COTI Typescript SDK Examples project. The script includes functions for transferring tokens, approving allowances, and handling confidential transactions. The script uses various utilities from the SDK to manage confidential accounts, decrypt values, and ensure correct balances and allowances during transactions. It will also:

• Create a EOA (Externally Owned Account)
• Validate minimum balance

1. Run erc20.ts script

   yarn erc20

   
   Running this test will automatically create an account and a key/value pair with name: SIGNING_KEY (visible in the .env file). The script will output something like this:\

   yarn run v1.22.22
   $ ts-node src/main.ts erc20
   ************* Created new account  0x87c13D0f5903a68bE8288E52b23A220CeC6b1aB6  and saved into .env file *************
   /Users/user/projects/coti-sdk-typescript-examples/src/util/onboard.ts:13
         throw new Error(`Please use faucet to fund account ${wallet.address}`)
               ^
   Error: Please use faucet to fund account 0x87c13D0f5903a68bE8288E52b23A220CeC6b1aB6

   
   It is normal to receive the exception Error: Please use faucet to fund account on the first run. This will be resolved once the account is funded.

2. Head to the faucet at https://faucet.coti.io to get devnet funds.
   Send the following message to the BOT using your newly created account, visible in the fourth line of the response Created new account 0x87c13D0f5903a68bE8288E52b23A220CeC6b1aB6 [...]

devnet <account address>
   
   The bot will reply with the message:
   
   <username> faucet transferred 5 COTIv2 (devnet)
   

3. Run erc20.ts script once more

   yarn erc20

Data On Chain

The following process will help you run the dataOnChain.ts example from the COTI Typescript SDK Examples project. The script includes functions for storing values on-chain that are encrypted using using either your user or the network key, and then reading these encrypted values and attempting to decrypt them using either your key or another users key.

1. Run dataOnChain.ts script

   yarn dataOnChain

Pending enhancements

• Extending examples such as confidential ERC20 minting, confidential NFT (deployment and actions) and more.

To report issues, please create a github issue