# \#announcement **URL:** https://collective.flashbots.net/tag/announcement/33.md [Latest](https://collective.flashbots.net/latest.md) · [Categories](https://collective.flashbots.net/categories.md) · [Tags](https://collective.flashbots.net/tags.md) --- ## [T-time attack analysis](https://collective.flashbots.net/t/t-time-attack-analysis/5352)
**Author:** [@igor](https://collective.flashbots.net/u/igor)\ **Replies:** 0\ **Last updated:** [October 29, 2025, 2:33pm UTC](https://collective.flashbots.net/t/t-time-attack-analysis/5352 "2025-10-29T14:33:13Z")
On Friday October 24 2025 at 10:05 am UTC, a recent timing-based attack targeting Intel TDX came to our attention. As a result, we conducted an internal analysis to assess its potential impact on our products. According… --- ## [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… --- ## [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 … --- ## [\[Announcement\] BuilderNet v1.5](https://collective.flashbots.net/t/announcement-buildernet-v1-5/5077)
**Author:** [@shea](https://collective.flashbots.net/u/shea)\ **Replies:** 0\ **Last updated:** [July 11, 2025, 1:48pm UTC](https://collective.flashbots.net/t/announcement-buildernet-v1-5/5077 "2025-07-11T13:48:02Z")
BuilderNet v1.5 is live! This release introduces EVM caching, an (even) faster root hash, and trusted TLS certificates to improve the security and experience of submitting orderflow. Read more: BuilderNet v1.5 | Builder… --- ## [📢 GCP Mempool Dumpster Public Data](https://collective.flashbots.net/t/gcp-mempool-dumpster-public-data/4730)
**Author:** [@tesa](https://collective.flashbots.net/u/tesa)\ **Replies:** 0\ **Last updated:** [February 27, 2025, 3:16pm UTC](https://collective.flashbots.net/t/gcp-mempool-dumpster-public-data/4730 "2025-02-27T15:16:24Z")
Gm! The Flashbots team is excited to announce that Mempool Dumpster data is now available on the Google Cloud Web3 Portal → ‘experimental’ → ‘Flashbots mempool data’. A direct link to the BigQuery dataset is available he… --- ## [Notice to \`relay.flashbots.net\` users: JSON-RPC Compatible Errors Coming January 9, 2025](https://collective.flashbots.net/t/notice-to-relay-flashbots-net-users-json-rpc-compatible-errors-coming-january-9-2025/4233)
**Author:** [@Tymur](https://collective.flashbots.net/u/Tymur)\ **Replies:** 1\ **Last updated:** [December 12, 2024, 6:40pm UTC](https://collective.flashbots.net/t/notice-to-relay-flashbots-net-users-json-rpc-compatible-errors-coming-january-9-2025/4233 "2024-12-12T18:40:57Z")
We are going to upgrade relay.flashbots.net to JSON-RPC compatible errors on January 9th, 2025. Context Due to historic reasons, the Flashbots bundle-relay (relay.flashbots.net) returns errors in a non-standard way. S… --- ## [Announcing In-Process rbuilder](https://collective.flashbots.net/t/announcing-in-process-rbuilder/4036)
**Author:** [@liamaharon](https://collective.flashbots.net/u/liamaharon)\ **Replies:** 0\ **Last updated:** [November 4, 2024, 1:33pm UTC](https://collective.flashbots.net/t/announcing-in-process-rbuilder/4036 "2024-11-04T13:33:16Z")
We’re excited to announce rbuilder now supports running in-process with reth! :tada: Check out the new reth-rbuilder crate for an example of how to run it, and for the curious out there the code deep-dive screencast for… --- ## [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… --- ## [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 … --- ## [Flashbots Protect Explorer](https://collective.flashbots.net/t/flashbots-protect-explorer/3652)
**Author:** [@tesa](https://collective.flashbots.net/u/tesa)\ **Replies:** 0\ **Last updated:** [July 8, 2024, 3:25pm UTC](https://collective.flashbots.net/t/flashbots-protect-explorer/3652 "2024-07-08T15:25:41Z")
What do? Introducing the Protect Explorer! A dashboard designed to illuminate the savings Protect users are enjoying. Flashbots Protect is the original MEV blocker for Ethereum transactions with MEV refunds and transact… --- ## [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… --- ## [Notice to Protect Users: Adjustment to builder sharing](https://collective.flashbots.net/t/notice-to-protect-users-adjustment-to-builder-sharing/3388)
**Author:** [@shea](https://collective.flashbots.net/u/shea)\ **Replies:** 0\ **Last updated:** [May 3, 2024, 10:34pm UTC](https://collective.flashbots.net/t/notice-to-protect-users-adjustment-to-builder-sharing/3388 "2024-05-03T22:34:29Z")
We are implementing a refund optimization process that will impact how Flashbots Protect shares transactions with other builders and chooses what is sent to the mempool. Change If a transaction is received at any point… --- ## [Flashbots Protect Website](https://collective.flashbots.net/t/flashbots-protect-website/2935)
**Author:** [@shea](https://collective.flashbots.net/u/shea)\ **Replies:** 0\ **Last updated:** [January 17, 2024, 3:01pm UTC](https://collective.flashbots.net/t/flashbots-protect-website/2935 "2024-01-17T15:01:23Z")
Flashbots Protect has a new website! Excited to share https://protect.flashbots.net/ What is it? Protect is a safer way to transact on Ethereum. It protects you from frontrunning and helps you earn refunds. Now, it’s ev… --- ## [New MEV-Share Client Libraries](https://collective.flashbots.net/t/new-mev-share-client-libraries/2549)
**Author:** [@brock](https://collective.flashbots.net/u/brock)\ **Replies:** 0\ **Last updated:** [October 17, 2023, 9:11pm UTC](https://collective.flashbots.net/t/new-mev-share-client-libraries/2549 "2023-10-17T21:11:03Z")
:tada: Exciting News! MEV-Share Client Libraries are Live! :rocket: Congratulations to the talented developers who have devoted so much time and effort to create well-crafted, developer-friendly client libraries for MEV… --- ## [Capella: Recommended Upgrades for Block Builders](https://collective.flashbots.net/t/capella-recommended-upgrades-for-block-builders/1582)
**Author:** [@Shana](https://collective.flashbots.net/u/Shana)\ **Replies:** 0\ **Last updated:** [April 10, 2023, 10:25pm UTC](https://collective.flashbots.net/t/capella-recommended-upgrades-for-block-builders/1582 "2023-04-10T22:25:09Z")
For the Capella upgrade scheduled on April 12, 2023, 10:27:35pm UTC and epoch 194048, all block builders will need upgrade their builder and CL infrastructure. We recommend the latest version v1.11.5-0.2.1 for the build… --- ## [The Flashbots Builder is now sending to external relays](https://collective.flashbots.net/t/the-flashbots-builder-is-now-sending-to-external-relays/898)
**Author:** [@angelfish](https://collective.flashbots.net/u/angelfish)\ **Replies:** 1\ **Last updated:** [March 1, 2023, 5:08pm UTC](https://collective.flashbots.net/t/the-flashbots-builder-is-now-sending-to-external-relays/898 "2023-03-01T17:08:42Z")
To foster a more competitive and healthy relay ecosystem, the Flashbots Builder is now sending blocks to Agnostic Relay by GnosisDAO and Ultrasound Relay by Ultrasound Money. We have also added this feature to submit bl… --- ## [Flashbots Bundle Relay API Upgrades](https://collective.flashbots.net/t/flashbots-bundle-relay-api-upgrades/896)
**Author:** [@angelfish](https://collective.flashbots.net/u/angelfish)\ **Replies:** 0\ **Last updated:** [December 7, 2022, 8:22pm UTC](https://collective.flashbots.net/t/flashbots-bundle-relay-api-upgrades/896 "2022-12-07T20:22:22Z")
We have a few important upgrades coming to the Flashbots Bundle Relay API! new methods with PoS related fields: flashbots\_getBundleStatsV2 and flashbots\_getUserStatsV2 bundle cancellations switch from HTTP to JSON-RPC s… --- ## [getBundleStats has new POS related fields!](https://collective.flashbots.net/t/getbundlestats-has-new-pos-related-fields/741)
**Author:** [@angelfish](https://collective.flashbots.net/u/angelfish)\ **Replies:** 0\ **Last updated:** [November 16, 2022, 6:37pm UTC](https://collective.flashbots.net/t/getbundlestats-has-new-pos-related-fields/741 "2022-11-16T18:37:34Z")
We are updating the flashbots\_getBundleStats JSON-RPC method to include two new fields that are relevant in POS: consideredByBuildersAt contains timestamps indicating when a builder considered the bundle for the targe… --- ## [Bundle cancellations testing](https://collective.flashbots.net/t/bundle-cancellations-testing/605)
**Author:** [@mateusz](https://collective.flashbots.net/u/mateusz)\ **Replies:** 16\ **Last updated:** [November 10, 2022, 9:56am UTC](https://collective.flashbots.net/t/bundle-cancellations-testing/605 "2022-11-10T09:56:21Z")
We are now testing a frequently requested feature - bundle cancellations! Bundles can be cancelled explicitly through a new method - eth\_cancelBundle, or they can be replaced via eth\_sendBundle. If you wish to be able …