Hack4Climate aims to bring together Developers and Climate Experts in order to build innovative solutions to fight climate change

1. Making Dapps More Energy
Efficient
XTECH HOLDING GMBH
https://www.xtech.ai

2. WHAT WE DO
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Instant Trading
On German Exchange
Secure Wallets
BTC, LTC, ERC20 Tokens
Instant Trading
ERC20 Token Check

3. DECENTRALISED APPLICATIONS
PROBLEMS
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Proof of work
Trial and error
Energy consumption
By using Blockchain Technologies
Mining
Minting of Crypto assets
Paying gas
Verify the network
Smart Contract
Complexities
Lack of Tools, Knowledge, Best
Practices, Stack Maturity

4. SOLUTION APPROACH:
COMPLEXITY IS YOUR ENEMY
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▪ Goal: Reduce the number of Transactions
▪ Enhance transparency by code analysis
▪ Disassemble smart contract bytecode
▪ Static code analysis
▪ Graph visualisation plus simple color coding of flow

5. RESULTS
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▪ Create trace of conditions: What are the conditions so that
X happens?
▪ Dead code detection: What parts of the code are unused
▪ Cross-contract analysis (after deployment)

6. HOW IT LOOKS LIKE
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7. HOW IT LOOKS LIKE
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8. LINKS & SOURCES
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▪ EVM Disassembler https://github.com/Arachnid/evmdis
▪ Porosity: Decompiler for Blockchain-based Ethereum Smart-
Contracts https://github.com/comaeio/porosity
▪ Porosity talk at DEFCON 25
https://www.youtube.com/watch?v=d7EcNyuJy2g
▪ Graph Visualisation http://www.graphviz.org

9. THE TEAM
KIAN SCHREIBER
Head of Business
CHRISTIAN GORGAS
Head of Product
ARNDT WEISSHUHN
Head of Technology
DANIEL RUDOLPH
Head of
System Architecture
RICHARD MITTMANN
Head of
Software Engineering
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ERIC REINHARDT
Head of
UI/UX Design

10. Thank you.
XTECH HOLDING GMBH
Rosenthaler Straße 34/35, 10178 Berlin, Germany
ARNDT WEISSHUHN CTO
M arndt@xtech.ai F +49 162 2421327
https://www.xtech.ai