BuilderNet v1.6

BuilderNet v1.6 is a major release focused on consolidation, performance, and protocol readiness. This update brings a ground-up rewrite of our orderflow ingestion layer, merges rbuilder-operator into the main rbuilder codebase, and adds full support for the upcoming Fusaka hardfork.

Highlights

• FlowProxy — Our new orderflow ingress and multiplexing system, completely rewritten in Rust. Faster, more reliable handling of incoming transactions and bundles.

• Fusaka-ready — Full support for the upcoming hardfork, including proper handling of system transactions. Required for mainnet compatibility when Fusaka activates.

• Optimistic v3 — New optimistic submission types for lower latency block submissions, helping you stay competitive in the bidding race.

• Simplified stack — The rbuilder-operator repository has been merged into rbuilder. One less component to deploy and maintain.

• Rebalancer service — Automates ETH movement between addresses, simplifying treasury management.

• Delay refunds (out of block payment) - Support for payments outside the main block.

• Performance improvements — Faster proof generation, improved bidding latency, and more efficient transaction ordering.

• DNS caching with DNSMASQ — Reduces latency and improves resilience by caching DNS lookups locally.

• Clickhouse on-disk backups — Buffers data locally to prevent loss during network issues or Clickhouse downtime.

Versions

The build toolchain for BuilderNet v1.6 is based on yocto-manifests v1.6.0 (commit 68962ce):

Updated services

Project	New Version	Commit	Previous Version
rbuilder	v1.2.28	9a82891	v1.2.6
Reth	v1.9.3	27a8c0f	v1.4.8
Lighthouse	v8.0.1	ced49dd	v7.0.1
FlowProxy	v1.2.1	3326911	-
HAProxy	3.2.8	9f4f467	3.0.6

Not updated services

Project	Version	Commit
CVM Proxy	v0.1.6	8e5c9a1
Operator API	v0.7.0	a8296e4
acme.sh	3.1.1-25-g42bbd1b4	42bbd1b4

Changes & Pull Requests

Project	Changes
rbuilder	v1.2.6...v1.2.28 (139 PRs)
Reth	v1.4.8...v1.9.3 (1570 PRs)
Lighthouse	v7.0.1...v8.0.1 (414 PRs)

Services Configuration

Service	Configuration
Operator API	meta-confidential-compute@06de303
HAProxy	meta-evm@fb265a0
Lighthouse	meta-evm@fb265a0
FlowProxy	meta-evm@fb265a0
Rbuilder	meta-evm@fb265a0
Reth	meta-evm@fb265a0

Artifacts

Signed artifacts are stored at https://downloads.buildernet.org/buildernet-images/.

The specific TDX VM image for the BuilderNet v1.6 release is located at /v1.6.0/buildernet-1.6.0-azure-tdx.wic.vhd

Measurements

These are the new live measurements for BuilderNet v1.6:

{
    "measurement_id": "buildernet-v1.6.0-azure-tdx.wic.vhd",
    "attestation_type": "azure-tdx",
    "measurements": {
        "4": {
            "expected": "bd5c5c469a57fdeae9a88ca8ef6682248f7aec1ba68173b6c09236d8dffbd8ae"
        },
        "9": {
            "expected": "b6d80052b6d6b655677ab464ef6485b47c139c4f2056665969b105398ae191c6"
        },
        "11": {
            "expected": "65711301762c58bbca51cfadd9b3b18cf662e5f38882a7150217fec4d7564663"
        }
    }
}

Reproducible Builds

BuilderNet v1.6 supports fully reproducible TDX image builds. The image you build will produce the exact same TDX measurements as our reference builds.

The main entry point for the image builds is the flashbots/yocto-manifests repository, and for this release specifically the yocto-manifests v1.6.0 (commit 68962ce).

To reproducibly build it, clone the repository, check out the tag and build it with Docker/Podman:

git clone https://github.com/flashbots/yocto-manifests.git
cd yocto-manifests
git checkout v1.6.0
make image-buildernet

You can confirm that the hash of your build matches the expected one:

make measurements-buildernet

Build host specs:

• Ubuntu 22.04 x64 (Linux kernel 6.8.0-49-generic), fully updated system
• Intel Xeon Gold 6312U, 48vCPUs, 512GB memory

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