Slides from the talk at Politecnico di Milano (3 December 2019) on how to build decentralised application on top of Bitcoin

1. Decentralised applications
on Bitcoin
Federico Tenga
Chainside

2. Bitcoin’s value proposition

3. Vision

4. Problems with the blockchain
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5. Problems with the blockchain
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6. Problems with the blockchain
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7. Problems with the blockchain
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8. Scalability issue
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9. Proposed workaround

10. Multiple blockchains are not sustainable!

11. The impossible triangle
Performance:
Consensus:
Decentralised:

12. Introducing layers

13. Introducing layers

14. TCP/IP LNP/BP

15. Disclaimer

16. Tokens on Bitcoin

17. Tokens on Bitcoin
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18. The RGB protocol
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19. RGB simplified scheme
Asset issuance
Amunt: 1000
Owner: Alice
From: Alice
To: Bob
Amount: 800
From: Bob
To: Carol
Amount: 800
From: Carol
To: Dave
Amount: 553.78

20. RGB features
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21. Distributed storage with Bitcoin

22. Distributed storage with Bitcoin
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23. Distributed storage with Bitcoin
Alice
Bob
Encrypted file

24. Distributed storage with Bitcoin
Alice
Bob
0.000001 btc
Proof of storage

25. Distributed storage with Bitcoin
Alice
Bob
0.00005 btc
Encrypted file

26. Distributed storage with Bitcoin
Bob

27. Distributed messaging with Bitcoin

28. Distributed messaging with Bitcoin
Alice Bob
Messaging apps usually work with a centralised server that relays all
the messages of all the users

29. Distributed messaging with Bitcoin
Alice Bob
Messaging apps usually work with a centralised server that relays all
the messages of all the users

30. Distributed messaging with Bitcoin
Alice Bob
Messaging apps usually work with a centralised server that relays all
the messages of all the users

31. Distributed messaging with Bitcoin
Alice Bob
However this is vulnerable to censorships attack and privacy violating behaviours

32. Distributed messaging with Bitcoin
Alice Bob
So ideally there should be a system for Alice to send an
encrypted message to Bob in a censorship resistant fashion

33. Distributed messaging with Bitcoin
Alice Bob
Alice wants to send a message to Bob, but she
doesn’t have a direct connection with him

34. Distributed messaging with Bitcoin
Alice Bob
However, if a network of connection exists, it is
possible through relays to get in touch with Bob

35. Distributed messaging with Bitcoin
Alice Bob

36. Distributed messaging with Bitcoin
Alice Bob

37. Distributed messaging with Bitcoin
Alice Bob

38. Distributed messaging with Bitcoin
Alice Bob
Unfortunately in this scheme there is no incentive to relay other
people messages and there is no spam prevention mechanism

39. Distributed messaging with Bitcoin
Alice Bob
A solution to this is to remunerate relay activities with
micro-payments on the Lightning Network

40. Distributed messaging with Bitcoin
Alice Bob
A solution to this is to remunerate relay activities with
micro-payments on the Lightning Network

41. Distributed messaging with Bitcoin
Alice Bob
A solution to this is to remunerate relay activities with
micro-payments on the Lightning Network

42. Distributed messaging with Bitcoin
Alice Bob
A solution to this is to remunerate relay activities with
micro-payments on the Lightning Network

43. Distributed messaging with Bitcoin
Alice Bob
What is one of the nodes along the path refuses to relay a message?

44. Distributed messaging with Bitcoin
Alice Bob
Simple, Alice will just find another path

45. Distributed messaging with Bitcoin
Alice Bob
Simple, Alice will just find another path

46. Distributed messaging with Bitcoin
Alice Bob
Simple, Alice will just find another path

47. Conclusions
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48. Federico Tenga