500 days of Dapps

My journey of building Blockparty, an event management dapp with a twist.

Transcript

1. @makoto_inoue @makoto 500 days of Dapps
2. Q: Coding Ethereum Smart Contract > 1 year ?
3. Day 1 (405 days ago)
4. 2016 Mar
5. A: 2 people
6. London Ethereum “CodeUp”
7. 365 days ago
8. London Ethereum “CodeUp” • Small audience • For coders • At • £5 donation to Whizzkids
9. • Ethereum 101 • Show & Tell CodeUp - Topics
10. CodeUp - #18
11. 324 days ago (May)
12. Company Hackathon
13. What should I make?
14. I have a problem to solve!
15. - Limited space - Huge sign ups - No turn ups Meetups - 50% problem Expectation Reality
16. - Escrow model - Micro payment - Game theory Solution - Block Party!!
17. Building Dapp 101
18. Step 1: Learn Solidity in 3 lines
19. msg.sender
20. msg.value
21. address.send()
22. Step 2: Deploy Solidity in 3 commands
23. http://truffleframework.com
24. Tada!
25. Tada! Add some video https://www.youtube.com/watch?v=Y1MfOGzpqYQ
26. Do you use BlockParty for CodeUp?
27. No
28. Why Not? Never Enough people in my meetup Takes half a day to sync Ethereum database No one has Ether
29. Ethereum is not ready yet to the Mass
30. What should I do?
31. The future is already here It’s just not very evenly distributed William Gibson
33. 306 days ago (June - July)
35. HACKED!!!
36. Smart contract programming requires a different engineering mindset ... similar to hardware programming or financial services programming than web or mobile development. https://github.com/ethereum/wiki/wiki/Safety
37. Step 3: Spend 3 months auditing my Dapp
38. Is my Dapp Okay?
39. NO
40. payback()
41. address.send()
42. To all participants...
43. A user can be a code
44. The fix - Pull payment pattern
45. Step 1: Mark payout amount
46. Step 2: Allow users to call withdraw individually
47. https://github.com/OpenZeppelin/zeppelin-solidity
48. Still not fixed: Re-entrancy attack vector!
49. Fixed!!!
50. Is my Dapp Okay now?
51. Not sure
52. Bug Bounty as a smart contract
53. Bounty smart contract
54. Bounty smart contract
55. Bounty smart contract
56. 206 days ago
57. I am ready now!
58. Step 1: Book a table
59. Step 2: Announce the event
60. Step 3: Register
61. Party!!
62. Did everybody turn up?
63. 140%!!!
64. Dapp effect:
65. Is Ethereum ready to the Mass?
66. Not quite Takes half a day to sync Ethereum database No one has Ether Not from mobile
67. What should I do?
68. 51 days ago
69. 2017 Feb
70. Step1: Book a table
71. Step 2: Announce the event
72. Step3: Register…
73. Why people are not registering?
74. Why don’t you integrate into mobile wallet? @PascalVanHecke
75. Mobile wallets
76. Status
77. Status
78. Status
79. Status
80. 10 minutes later….
81. 11:07
82. DAppleths
83. Ethereum as a bot
84. 11:13
85. 3 hrs later….
86. 15:31
87. http://github.io/inzhoop-co/LETH
88. The following day
89. 08:00
90. Tada!!
91. The first mobile Dapp experience (on mainnet?)
92. At Ethereum Night
93. 22:15
94. Hey, can I join your party? @nicksdjohnson
95. 0.6 ETH: 0.6
96. Can I borrow some money?
97. 1.1 ETH: 1.1
98. Error: Insufficient funds for gas* price + value
99. 23:30
100. 23:42
101. Did everybody turn up?
102. 7 turn ups
103. 2 no turn ups
104. Deposit as a present
105. My first ever profit!!
106. Is Ethereum ready to the Mass?
107. Not quite Takes half a day to sync Ethereum database No one has Ether Not from mobile
108. Would people ever buy Ether?
109. Stable Coins
110. And each Dapp depends on each other
111. Dapps ecosystem
112. Dapps ecosystem
113. What would you build?
114. 100 days from now (Day 505)
115. Insurance Blockchain Hackathon 21-23 July, London Organised by Simply Business
116. Dapps ecosystem Insurance Bank Derivatives
117. Dapps ecosystem Insurance Bank Derivatives Meetup Sharing economy IoT Law Music
118. @makoto_inoue @makoto Thanks!!