Release Candidate for Kava 14

For deployment to Kava Testnet at height 5886355 around 2023-06-23 00:00:00 UTC.

This release adds the ability to convert between a cosmos-native asset (sdk.Coin) and an ERC20 representation of the asset in the EVM. The assets allowed for conversion can be controlled by Kava DAO via a new parameter to the x/evmutil module.

Note: This is a release candidate only. Do not attempt to run this software on mainnet.

Software versions:
Golang: v1.20
Cosmos-sdk: v0.46.11
CometBFT: v0.34.27 (formerly Tendermint)

For a complete list of changes, including client breaking changes, see CHANGELOG.md.

Cosmos Coin <=> ERC20 Conversion

For a technical overview of conversion, see the "Cosmos-Native Assets" section of the x/evmutil spec.

Allowed assets

Kava DAO controls which assets are allow-listed for conversion via a new x/evmutil parameter, allowed_cosmos_denoms.

The upgrade handlers included in this release initialize the parameter:

• The Testnet upgrade handler, v0.24.0-alpha.0, allows HARD tokens (hard) to be converted to an ERC20
• The Mainnet upgrade handler, v0.24.0, allows ATOM (ibc/27394FB092D2ECCD56123C74F36E4C1F926001CEADA9CA97EA622B25F41E5EB2) to be converted

New Messages

Conversion is managed via two new messages:

• MsgConvertCosmosCoinToERC20 performs the conversion from Cosmos coin to ERC20. ERC20 contracts are deployed and owned by the x/evmutil module account, and are deployed on first conversion.
• MsgConvertCosmosCoinFromERC20 converts the ERC20 back to the underlying Cosmos coin.

Enumerating Cosmos Coin ERC20 Contracts

A new x/evmutil query is added for enumerating deployed contracts: /kava/evmutil/v1beta1/deployed_cosmos_coin_contracts.