# Custom data-compression in Polygon zkEVM

- Speakers: [Carlos Matallana](https://streameth.org/speakers/carlos-matallana)
- Event: [EVM Summit](https://streameth.org/devconnect/evm_summit), Istanbul Congress Center (ICC), Turkey - B2 Level, Emirgan 1-2 Rooms
- Channel: [Devconnect](https://streameth.org/devconnect)
- Date: 2023-11-14
- Duration: 15:46
- Watch: https://streameth.org/watch/65b8f8d0a5b2d09b88ec12d6
- Download: https://vod-cdn.lp-playback.studio/raw/jxf4iblf6wlsyor6526t4tcmtmqa/catalyst-vod-com/hls/f343o20h75o3dk3f/1080p0.mp4

## Description

L2 data transaction cost is basically the cost of the  data-availability in L1. Therefore, reducing the data posted on-chain is key to decrease L2 transaction cost.
We introduce a very simple and custom function data set to compress data.

## About the speakers

### Carlos Matallana

Protocol blockchain engineer focused on L2 solutions.
Started working on Iden3 and then switch to develop the PoC of a rollup back in 2019.
Then, I started on Hermez network as a protocol engineer which became polygon zkEVM