Blockchain Engineering 2023 - Token Transaction Engine II

[InvictusRMC]

Token transaction engine. Create a lightweight and fast token transaction engine for mobile devices. Your engine should be able to process 1000 transactions per second with standard 4G connectivity. Record these transactions within a simple SQLite backend. Realise simple primitives such as send/receive token primitives. Required background reading: ConTrib: Universal and Decentralized Accounting in Shared-Resource Systems.

[InvictusRMC]

Progress:

All team member were able to compile from source 🎉, but please help AK!

• April 20 or 21 april
• Prior work for tokens:
  • EuroToken.pdf
  • https://github.com/Tribler/trustchain-superapp#digital-euro
• Next sprint:
  • Look at IPv8: https://py-ipv8.readthedocs.io/en/latest/basics/overlay_tutorial.html
  • Transactions: Create IPv8 overlay, and make first transaction between clients.
• For future sprints:
  • https://github.com/Tribler/kotlin-ipv8/blob/master/doc/TrustChainCommunity.md

GitHub handles to add:

• AkramNexus
• bbrockbernd
• C6H5-NO2
• nealsweijen61

[bbrockbernd]

Could you add sem as well: SDuveen

[nealsweijen61]

Created an IPv8 overlay

[nealsweijen61]

https://github.com/bbrockbernd/trustchain-superapp

[InvictusRMC]

• Team managed to get a community working

Next sprint:

• Please update ticket before meeting (APK file???)
• Get simple token structure up and running based on trustchain
• Implement simple database structure:
  • Look at other SQlite database usage

[AkramNexus]

Apk file for this week's sprint:

https://bit.ly/3ZITPTN

[nealsweijen61]

Contains possibilities to see message of others, send them tokens, and has a sqlite backend too! Also changed the project to a new android module

[InvictusRMC]

First APK file! App crashes, this is expected 😄

✅ Basic token structure achieved 🟥 No usage of trustchain yet

Next sprint:

Upping the performance and hitting limits:

• Group transactions and see how much you can put in a single UDP message
  • What transactions to group together?
  • What to do when a message is lost?
  • When is a message lost?
  • How do we recover?
• Make a script that generates a lot of transactions

[bbrockbernd]

Meeting wednesday:

• Figure out what are the right conventions for refreshing peers, sending and receiving in a community. (Akram)
• Generate a lot of transactions, co routines (Sem)
• Grouping of transactions (Junbo)
• Fix UI bugs, and functionality (Bob)
• Lost messages (Neal)

[nealsweijen61]

Fixed UI bugs and functionality, written script for executing a lot of transaction(not tested) and created a way to resend messages when a message is not received.

[InvictusRMC]

A basic token structure working, well done!

• Focus on using TrustChain ASAP: https://github.com/Tribler/kotlin-ipv8/blob/master/doc/TrustChainCommunity.md
• Please also have a look at the already merged (!) code by other groups: https://github.com/Tribler/trustchain-superapp/pull/136
  • Extend if possible or ignore if not useful 😄
• Working token structure using TrustChain: https://github.com/KoningR/eurotoken/blob/main/src/main/kotlin/Token.kt#L27
• Have a look at running dummy nodes
• Flame graph: https://queue.acm.org/downloads/2016/Gregg4.svg
• Example from MSc thesis
  

[nealsweijen61]

Implementation on trustchain, made dummy node(question about this), grouping of messages.

[InvictusRMC]

Progress

• Trustchain implementation is (almost) working ✔️
• Dummy nodes WIP
• Grouping of messages working ✔️
  • Please handle resends properly

Next sprint

Performance analysis

• Use a single laptop: https://stackoverflow.com/questions/59713887/socket-connection-between-two-emulators
• Focus on creating a flame graph
• Use 1000 transactions, local connection single laptop: reduces latency and congestion issues!
• Difference when grouping vs direct transactions

Deliverables:

• UI: '1000 txs' --> benchmark and generate statistics on the screen
• API: finalize design and start documenting in report
• Note that markdown-style report is, next to your code, key deliverable for this course.

[InvictusRMC]

Example README: https://github.com/Tribler/trustchain-superapp/blob/master/currencyii/README.md

Also, please create a pull request before the next sprint! This can be a draft PR that is mergeable.

[nealsweijen61]

Trustchain store for tokens(almost done), grouping and resending on trustchain, dummy nodes see app peers(but not the other way around??)

[InvictusRMC]

• Lesson learned: Kotlin and Python don't like talking with each other.

Prioritization

• [x] Merge all code
• [ ] Focus on benchmarking
  • [ ] Flame graph
  • [ ] Networking benchmarks
  • Example thesis with good analysis
• [ ] Write Unit tests
• [x] Make PR and post APK to your issue
• [ ] Readme
  • [ ] Add 1 section serving as documentation, look around for ideas:
    • https://github.com/Tribler/trustchain-superapp#peerchat
    • https://github.com/Tribler/trustchain-superapp#digital-euro
    • https://github.com/Tribler/trustchain-superapp#ai-trading-bot
    • https://github.com/Tribler/trustchain-superapp#luxury-socialism
    • https://github.com/Tribler/trustchain-superapp#freedom-of-computing-app-
  • [ ] Add animated GIF to your readme
  • [ ] Add flame graph and interesting statistics

[InvictusRMC]

Please also check with the missing team member whether they have any unavailable timeslots for the examination meeting on the 20th or 21st of April.

[AkramNexus]

New APK built from master branch on april 11th: https://we.tl/t-cjbelPP6z5

[nealsweijen61]

This sprint we finalized the trustchain implementation and now also use the grouping with this implementation. For benchmarking an enviroment a special enviroment has been created that only starts detoks engine and required other communites. WIP: benchmark the newly implemented trustchain implementation.