Overlay Networks:
Group project
Final Presentation
by Yury Belevskiy, Silvan Imhof, Christian Killer, Sebastian Schrepfer
live slides
Overview
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Architecture
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Business Case
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Challenges and Problems
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Demonstration
goo.gl/39856J
Business Case
1
Business Case
- Two parties are chatting, and they want to have a binding agreement exchanging certain messages
- They don't blindly trust each other and want to be able to prove that one party said something at some point in time
- For messages that deem important, the notary service can be used to save messages into the Ethereum public blockchain
- These messages are immutable by any party
- Any party with the knowledge of the message identifier can look up whether a certain message has truly been sent at which point in time
Contracts-as-a-Service
Architecture
2
Architecture Full Project
boot
boot
Product Vision
Architecture Ethereum
boot
boot
Web Front-End Technologies
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Spring Boot Application
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Vue.js (& vue-resource)
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WebSockets (SockJS, Stomp)
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REST Interfaces
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Font Awesome
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Local Storage
Notary Technologies
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Ethereum
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Ropsten Testnet
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Smart Contract
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Geth
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Web3J
P2P implementation
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Each user is associated with PeerDHT
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User data is stored in DHT with TTL
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JobScheduler is used to refresh user data and push multiple copies (direct replication)
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Exchange message using FutureDirect
Challenges and Problems
3
Issues experienced
- Ropsten Testnet was under attack multiple times
- Syncing takes unreasonable amount of time
- Light mode solves this problem
- Compiling smart contracts locally running Windows is a pain
- Remix IDE solves this problem
- Documentation and Information about TomP2P, Web3J, Solidity, wrapping etc. exists, but not very extensive
- macOS / Apple failed us
- Issues with Geth
Conclusion
3
Conclusion
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SCRUM experience was beneficial in every way
- Thanks to ti&m and CSG
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Ethereum / Web3j quite steep learning curve
- A lot of research before first LOC