📣 Summary

v4.0.0 is the new stable mainnet release of the mezod chain client software. It introduces a possibility to bridge assets out of Mezo to Ethereum and Bitcoin chains.

This release incurs a mandatory upgrade of all Mezo Mainnet nodes that must occur on block 3194000 (ETA Monday, September 15th, around noon UTC)

📝 Changelog

Bump internal RPC node to v3.0.0 by @lukasz-zimnoch in #515
backport fix from: cosmos/evm#296 by @jeremyletang in #517
Fix dropping events in the eth_subscribe rpc by @jeremyletang in #516
Websocket rpc issues by @jeremyletang in #520
Bump testnet nodes to v3.0.1-rc1 by @lukasz-zimnoch in #519
Implement AssetsBridge.bridgeOut method by @jeremyletang in #509
Hardhat task to call bridge out action by @lukasz-zimnoch in #521
AssetsUnlocked monitoring loop: mezod side by @tomaszslabon in #518
Used string to represent sender in AssetsUnlockedEvent by @tomaszslabon in #522
RFC-5: Bridging assets out of Mezo by @lukasz-zimnoch in #524
Websocket rpc issue by @jeremyletang in #525
add initial system tests coverage for bridging out by @jeremyletang in #523
Expose keyring in ethereum sidecar by @jeremyletang in #527
AssetsUnlocked monitoring loop: Ethereum sidecar side by @tomaszslabon in #506
Missing unit tests for Ethereum sidecar server by @tomaszslabon in #528
Auto-restore CometBFT subscriptions upon internal WS client reconnection by @lukasz-zimnoch in #529
Bump Mezo Testnet nodes to v3.0.0-rc3 by @lukasz-zimnoch in #526
Re-generate bindings for Sepolia by @lukasz-zimnoch in #532
Integrate bridge out bindings with Ethereum sidecar by @lukasz-zimnoch in #533
Bridge outflow limits by @lukasz-zimnoch in #534
Bridge out pause button by @lukasz-zimnoch in #535
AssetsBridge precompile: Minimum bridgeable amounts by @tomaszslabon in #531
add individual attestation creation and submission by @jeremyletang in #530
Minor sidecar improvements by @lukasz-zimnoch in #538
Ethereum sidecar: Don't run monitoring and attestation loops for non-bridge validators by @tomaszslabon in #537
Align Ethereum sidecar flags naming by @lukasz-zimnoch in #539
Batch attestation ground work by @jeremyletang in #542
Slight improvements to the batch attestation process by @lukasz-zimnoch in #543
Attestation finality checks by @lukasz-zimnoch in #544
Fix attestation ABI encoding and digest calculation by @lukasz-zimnoch in #545
Fix Docker image GLIBC issue by @lukasz-zimnoch in #548
The v4.0.0 upgrade handler by @lukasz-zimnoch in #547
Bump testnet nodes to v4.0.0-rc0 by @lukasz-zimnoch in #549
Bridge worker: scaffolding by @tomaszslabon in #541
Bridge worker: tBTC bindings by @tomaszslabon in #552
Prepare the metrics scraper to be extended with new jobs by @lukasz-zimnoch in #551
Introduce Bitcoin-specific min amount for bridge out by @lukasz-zimnoch in #556
Fix Dockerfile after tBTC bindings addition by @lukasz-zimnoch in #557
Bump testnet nodes to v4.0.0-rc2 by @lukasz-zimnoch in #558
Bridge worker: call execution by @tomaszslabon in #550
Update MezoBridge mainnet bindings by @lukasz-zimnoch in #559
Expose metrics for pending bridge requests by @lukasz-zimnoch in #553
Grafana dashboard for the bridge by @lukasz-zimnoch in #560
Set mainnet block for the v4.0.0 upgrade by @lukasz-zimnoch in #561

Full Changelog: v3.0.1...v4.0.0

⚙️ Node setup

For guidance around node setup, please refer to the Validator Kit repository.

🔐 Signatures

We're providing two pieces of information for node providers and other interested parties:

The Docker image sha256sum
The Linux binary archive sha256 sum

Both hashes are signed by the development team and verifiable on Keybase. Our Keybase usernames are all associated our GitHub usernames.

Docker image

Image: mezo/mezod:v4.0.0.
sha256 sum: sha256:bf5bfb767512a4b3637f7e4e0781bf3eaf3ea3b2c63a6633c524da54b83727a1

Signatures from the development team (verify these in the Keybase app):

@lukasz-zimnoch
BEGIN KEYBASE SALTPACK SIGNED MESSAGE. kXR7VktZdyH7rvq v5weRa0zk90sDpX wIX07Cfy2Yz31Xq 8mliRvTpoVIDeBV VZiP1JZd9aCqp7d ebd4qIXhYCKLjei 22wy769cPvWPrT1 nXmhcHYM3luN3wu susNkiCdMCScrLI oHiPayrEKAxrMbK GNC4VuZegbYBoyV iVnz7KD1QiEXgL2 AdPCf7Otilckd8J H6KdjKXH2hXIPgx 30Z06C8v3eHLqQA dfiwn4HHJGEqJrq 6H2vZR4mJ5HQcch Byt6SNWN4jrMHCc femRUwO2t4j. END KEYBASE SALTPACK SIGNED MESSAGE.
@tomaszslabon
BEGIN KEYBASE SALTPACK SIGNED MESSAGE. kXR7VktZdyH7rvq v5weRa0zk7xdHzK Gm9BtmKb2FhcVia 1x14PuUuG7fVaLE jQhGdMxCf8FCjBZ qnsHRRh8OOzn6vX E5WTvzbW9I4HqYy zJT64EReJDaLcoT ZUeJjw2EbXwKZki KnTe29WG4ABOKVH E4tOfezGKx7hqN6 lxp3u0ygsaotLc6 Ne7ohe3QJQWMXmc vAtietdVt0YT6tA R4wMMC8v3eHLqQA dfiwn4HHJGEqJrq 6H2vZR4mJ5HQcch Byt6SNWN4jrMHCc femRUwO2t4j. END KEYBASE SALTPACK SIGNED MESSAGE.

Linux binary

Archive: linux-amd64.tar.gz (see Assets section)
sha256 sum: a8a4319ac8c53456815153d1a7b3f9ef72f250d1f0733eb057fa733d7aa56771 linux-amd64.tar.gz