# The problem of historical data availability in EVM chains

- Speakers: [Konstantinos Paparas](https://streameth.org/speakers/konstantinos-paparas), [Lefteris Karapetsas](https://streameth.org/speakers/lefteris-karapetsas), [Yabir Garcia](https://streameth.org/speakers/yabir-garcia)
- Event: [Protocol Berg](https://streameth.org/ethberlin/protocol_berg), Berlin
- Channel: [ETHBerlin](https://streameth.org/ethberlin)
- Date: 2023-09-15
- Duration: 39:29
- Watch: https://streameth.org/watch/65b8f8d0a5b2d09b88ec123a

## Description

This presentation will try to explain what the problem of historical data availability is in EVM chains, why it exists and how we can try to tackle it.

## About the speakers

### Konstantinos Paparas

Open-source engineer
Frontend lead/Infra @ rotki

### Lefteris Karapetsas

Ethereum developer since 2014! Contributed to the solidity compiler and C++ ethereum. Built the DAO, saw it get destroyed, then hacked it back to save whatever we could both in ETH and ETC. Development lead for the Raiden network. Founder of rotki. I like birding :D

### Yabir Garcia

Backend developer for rotki. Background on mathematics and CS