cosmos/ibc-go v4.0.0-rc1

on GitHub

This release includes v1 of the Fee Middleware module. 🍾 Please read the introduction blog post and the documentation!

It also bumps the Go version to v1.18 and the Cosmos SDK to v0.45.6 (for more information, see Cosmos SDK v0.45.6 Release Notes), and introduces several improvements and bug fixes. We present here a summary of the most relevant changes in comparison to v4.0.0-rc0. Please see the v4.0.0 changelog for the full set of changes included in this pre-release.

core/03-connection

• The defensive logic to handle crossing hellos has been removed from the connection handshake. The PreviousConnectionId field in MsgConnectionOpenTry has been deprecated.

core/04-channel

• The defensive logic to handle crossing hellos has been removed from the channel handshake. The PreviousChannelId field in MsgChannelOpenTry has been deprecated.

apps/transfer

• A new migration has been added to correct any malformed trace path information of tokens whose base denomination contains slashes. The transfer module consensus version has been bumped to 2.
• The channel ID is now used to split the complete denomination into the trace path and the base denomination. Previously the port ID transfer was used.

light-clients/07-tendermint

• Client upgrade proposals are now able to update the TrustingPeriod of the light client.

Special thanks to our external contributors on this release: @faddat @vuong177

To learn more about ibc-go versioning, please read our RELEASES.md.

IMPORTANT: Please read the migration guides for any versions of ibc-go that you might be going through when upgrading to this version. For example: if you upgrade from the IBC module contained in the Cosmos SDK 0.42.0 to SDK v0.45.6 and ibc-go v4.0.0-rc1, please follow:

1. The migration from SDK 0.41.x or 0.42.x to the IBC module in the ibc-go repository based on the SDK v0.44.x.
2. The migration from ibc-go v1 to v2.
3. The migration from ibc-go v2 to v3.
4. The migration from ibc-go v3 to v4.