# MEV-Boost Community Call #3 - 20 Apr 2023
**URL:** https://collective.flashbots.net/t/mev-boost-community-call-3-20-apr-2023/1596
**Category:** The Flashbots Ship
**Tags:** mev-boost, pbs
**Created:** [April 13, 2023, 2:02am UTC](https://collective.flashbots.net/t/mev-boost-community-call-3-20-apr-2023/1596 "2023-04-13T02:02:50Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@ralexstokes](https://collective.flashbots.net/u/ralexstokes)
#### Post date: [April 13, 2023, 2:02am UTC](https://collective.flashbots.net/t/mev-boost-community-call-3-20-apr-2023/1596/1 "2023-04-13T02:02:50Z")
# Meeting Info
- [20 Apr, 2023, 15:30 UTC](https://savvytime.com/converter/utc-to-germany-berlin-united-kingdom-london-ny-new-york-city-ca-san-francisco-china-shanghai-japan-tokyo-australia-sydney/apr-20-2023/15-30)
- Duration: 90 minutes
- Recording: [https://youtu.be/U3ncYq60A2U](https://youtu.be/U3ncYq60A2U)
- Zoom: [Launch Meeting - Zoom](https://ethereumfoundation.zoom.us/j/2500703311?pwd=QWVIaUcyRWRWZTcvbk12M0orV3Zhdz09)
## Agenda
- capella upgrade
- mainnet recap
- prysm issue
- testing strategy moving forward
- unbundling attacks
- retro on “sandwich the ripper”
- r/d discussion on unbundling moving forward
- open discussion
- block cancellations
- PON relay overview
---
### Author:  [@metachris](https://collective.flashbots.net/u/metachris)
#### Post date: [April 18, 2023, 7:05pm UTC](https://collective.flashbots.net/t/mev-boost-community-call-3-20-apr-2023/1596/2 "2023-04-18T19:05:48Z")
I’d like to add one more topic to discuss: block cancellations (i.e. builders overwriting higher-value submissions with later lower-value submissions).
In particular, that they are generally incompatible with two-slot in-protocol PBS designs, being incentive incompatible, and are strongly detrimental to relay performance (since every single submission needs to be validated), among further issues with them.