# \#builder **URL:** https://collective.flashbots.net/tag/builder/93.md [Latest](https://collective.flashbots.net/latest.md) · [Categories](https://collective.flashbots.net/categories.md) · [Tags](https://collective.flashbots.net/tags.md) --- ## [Pre-FRP: Topological MEV Detection During Block Construction](https://collective.flashbots.net/t/pre-frp-topological-mev-detection-during-block-construction/5946)
**Author:** [@simplex\_tda](https://collective.flashbots.net/u/simplex_tda)\ **Replies:** 0\ **Last updated:** [August 26, 2026, 1:03am UTC](https://collective.flashbots.net/t/pre-frp-topological-mev-detection-during-block-construction/5946 "2026-08-26T01:03:13Z")
Pre-FRP: Topological MEV Detection During Block Construction I’ve been investigating whether Topological Data Analysis (TDA) can detect MEV on Ethereum, using the EigenPhi DeFi-Behavior 0728 labeled dataset, Ethereum bl… --- ## [Requesting builder inclusion in MEV-Share downstream forwarding — AdValorem rbuilder](https://collective.flashbots.net/t/requesting-builder-inclusion-in-mev-share-downstream-forwarding-advalorem-rbuilder/5846)
**Author:** [@Valk](https://collective.flashbots.net/u/Valk)\ **Replies:** 0\ **Last updated:** [July 21, 2026, 7:25pm UTC](https://collective.flashbots.net/t/requesting-builder-inclusion-in-mev-share-downstream-forwarding-advalorem-rbuilder/5846 "2026-07-21T19:25:15Z")
Hi Flashbots team, I operate AdValorem’s block builder (rbuilder) on Ethereum mainnet. We’re a production builder submitting to Flashbots, Titan, Aestus, and Agnostic relays. Looking to open two questions about receivin… --- ## [Beyond Flashtestations](https://collective.flashbots.net/t/beyond-flashtestations/5342)
**Author:** [@imtei](https://collective.flashbots.net/u/imtei)\ **Replies:** 1\ **Last updated:** [November 28, 2025, 6:13pm UTC](https://collective.flashbots.net/t/beyond-flashtestations/5342 "2025-11-28T18:13:16Z")
Hi, I’m Tei from Sunnyside Labs. Sunnyside Labs is a core dev company of Optimism Collective and Ethereum. We’re scaling Ethereum by contributing and building products. We’re sharing a high-level proposal to extend Fla… --- ## [Why TEE.fail is bullish for BuilderNet: Hardening the Path to Permissionless Blockbuilding](https://collective.flashbots.net/t/why-tee-fail-is-bullish-for-buildernet-hardening-the-path-to-permissionless-blockbuilding/5349)
**Author:** [@Quintus](https://collective.flashbots.net/u/Quintus)\ **Replies:** 0\ **Last updated:** [October 28, 2025, 11:17pm UTC](https://collective.flashbots.net/t/why-tee-fail-is-bullish-for-buildernet-hardening-the-path-to-permissionless-blockbuilding/5349 "2025-10-28T23:17:17Z")
Recently, wiretap.fail, battering RAM and tee.fail attacks were made public. These are not applicable to BuilderNet or any Flashbots products and do not enable frontrunning or unbundling. These attacks do not deviate fro… --- ## [Interview Study Eth Consensus Layer (call for interviewees)](https://collective.flashbots.net/t/interview-study-eth-consensus-layer-call-for-interviewees/5279)
**Author:** [@steeef](https://collective.flashbots.net/u/steeef)\ **Replies:** 0\ **Last updated:** [September 18, 2025, 4:15pm UTC](https://collective.flashbots.net/t/interview-study-eth-consensus-layer-call-for-interviewees/5279 "2025-09-18T16:15:35Z")
Hi all! I am a researcher at the University of Amsterdam, and I am currently working on a research project that is focused on the Ethereum consensus layer. More specifically, I aim to understand the decision-making proc… --- ## [The First L2 TEE Block Builder is Live on Unichain Mainnet](https://collective.flashbots.net/t/the-first-l2-tee-block-builder-is-live-on-unichain-mainnet/4917)
**Author:** [@dmarz](https://collective.flashbots.net/u/dmarz)\ **Replies:** 3\ **Last updated:** [July 25, 2025, 7:56pm UTC](https://collective.flashbots.net/t/the-first-l2-tee-block-builder-is-live-on-unichain-mainnet/4917 "2025-07-25T19:56:16Z")
Unichain x Rollup-Boost We are excited to announce Unichain is the first L2 to release Rollup-Boost and deploy TEE block building on mainnet! Rollup-Boost upgrades the performance, programmability, and decentralization … --- ## [Builder-playground: Simplifying Local Testing Environments for Block Building](https://collective.flashbots.net/t/builder-playground-simplifying-local-testing-environments-for-block-building/4863)
**Author:** [@ferranbt](https://collective.flashbots.net/u/ferranbt)\ **Replies:** 0\ **Last updated:** [April 7, 2025, 4:23pm UTC](https://collective.flashbots.net/t/builder-playground-simplifying-local-testing-environments-for-block-building/4863 "2025-04-07T16:23:47Z")
We’re excited to announce Builder Playground, an open-source framework to quickly spin up comprehensive block-building test environments for L1 and L2. After wrestling with tools that were either too slow, too inflexi… --- ## [Introducing BuilderNet](https://collective.flashbots.net/t/introducing-buildernet/4173)
**Author:** [@system](https://collective.flashbots.net/u/system)\ **Replies:** 0\ **Last updated:** [November 26, 2024, 10:10pm UTC](https://collective.flashbots.net/t/introducing-buildernet/4173 "2024-11-26T22:10:35Z")
Read the full mission statement here Flashbots and collaborators have spent the past 2 years experimenting with different ways to decentralize block building — from programmable privacy (e.g. MEV-Share and TEE searc… --- ## [Building Secure Ethereum Blocks on Minimal Intel TDX Confidential VMs](https://collective.flashbots.net/t/building-secure-ethereum-blocks-on-minimal-intel-tdx-confidential-vms/3795)
**Author:** [@Moe](https://collective.flashbots.net/u/Moe)\ **Replies:** 7\ **Last updated:** [November 5, 2024, 8:48am UTC](https://collective.flashbots.net/t/building-secure-ethereum-blocks-on-minimal-intel-tdx-confidential-vms/3795 "2024-11-05T08:48:34Z")
TL;DR: In this post, we present our experiment of running Flashbots Rbuilder in Intel TDX, which we demo-ed at TEE.Salon in Brussels. Rbuilder is an Ethereum block builder written in Rust, focused on performance, modu… --- ## [Introducing Gas Fee Refunds on Flashbots Protect and builder](https://collective.flashbots.net/t/introducing-gas-fee-refunds-on-flashbots-protect-and-builder/3668)
**Author:** [@Fred](https://collective.flashbots.net/u/Fred)\ **Replies:** 1\ **Last updated:** [July 21, 2024, 9:13am UTC](https://collective.flashbots.net/t/introducing-gas-fee-refunds-on-flashbots-protect-and-builder/3668 "2024-07-21T09:13:48Z")
On July 8th, we launched Gas Fee Refunds as an open, permissionless alternative to proprietary orderflow deals. Gas refunds are live today for all transactions sent through Flashbots Protect and builder. The refund rule … --- ## [Open sourcing rbuilder](https://collective.flashbots.net/t/open-sourcing-rbuilder/3631)
**Author:** [@jakub](https://collective.flashbots.net/u/jakub)\ **Replies:** 2\ **Last updated:** [July 4, 2024, 6:29pm UTC](https://collective.flashbots.net/t/open-sourcing-rbuilder/3631 "2024-07-04T18:29:35Z")
This post was originally posted on 2024-07-03 We’ve open sourced rbuilder, our latest and most performant block builder written in Rust, and designed to work with Reth. You can find the full post below; please share an… --- ## [Adjusting the bidding strategy in the Flashbots block builder](https://collective.flashbots.net/t/adjusting-the-bidding-strategy-in-the-flashbots-block-builder/3595)
**Author:** [@shea](https://collective.flashbots.net/u/shea)\ **Replies:** 0\ **Last updated:** [June 25, 2024, 10:11pm UTC](https://collective.flashbots.net/t/adjusting-the-bidding-strategy-in-the-flashbots-block-builder/3595 "2024-06-25T22:11:16Z")
Tl;dr We are experimenting with a new bidding strategy in the Flashbots builder. Under this strategy, the Flashbots builder will no longer bid its true block value. Instead, it will adjust its bid dynamically in response… --- ## [Dealing with spam caused by on-chain searching](https://collective.flashbots.net/t/dealing-with-spam-caused-by-on-chain-searching/3381)
**Author:** [@Quintus](https://collective.flashbots.net/u/Quintus)\ **Replies:** 6\ **Last updated:** [May 14, 2024, 7:43pm UTC](https://collective.flashbots.net/t/dealing-with-spam-caused-by-on-chain-searching/3381 "2024-05-14T19:43:10Z")
We have seen a spamming dynamic on chains like Base and Solana in which searchers will fire off very many transactions, each with a very high probability of reverting and only capturing every now and then. The exact con…