# Zahary Karadjov, Blocksense: Decentralized Oracles: Harder than you think | ETHSofia 2024

- Channel: [ETHSofia](https://streameth.org/ethsofia)
- Date: 2025-10-09
- Duration: 21:16
- Topics: Blocksense, Zahary Karadjov, ETHSofia, ETHConference, EthereumConference, Ethereum Community, Oracles, Decentralized Oracles
- Watch: https://streameth.org/watch/yt-_Qm0wcVxxNk
- YouTube: https://www.youtube.com/watch?v=_Qm0wcVxxNk

## Description

In this talk, Zahary Karadjov will walk you through the history of decentralized oracle protocols and the key problems that made them challenging until now. Learn how the power of smart contracts and ZK circuits can be used by cunning adversaries to automate the corruption of the participants in decentralized protocols and how perverse incentives make the cryptoeconomic security of oracles particularly elusive.

Speaker: Zahary Karadjov, Founder and CEO of Blocksense

Chapters:
00:00 - Introduction and Overview
02:01 - Importance of Decentralized Oracles
02:36 - Issues with Centralized Oracles
03:07 - The Need for a Decentralized Oracle Protocol
04:09 - Incentivizing Truthful Data Reporting
05:24 - Attack Scenario: Manipulating the Consensus
08:22 - Smart Contract Vulnerabilities and Attack Methods
13:03 - Appeal Mechanisms in the Oracle Network

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