-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathblockchain.html
177 lines (125 loc) · 3.89 KB
/
blockchain.html
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
<!DOCTYPE html>
<html>
<head>
<title>Containers-pres</title>
<meta charset="utf-8">
<style>
@import url(https://fonts.googleapis.com/css?family=Yanone+Kaffeesatz);
@import url(https://fonts.googleapis.com/css?family=Droid+Serif:400,700,400italic);
@import url(https://fonts.googleapis.com/css?family=Ubuntu+Mono:400,700,400italic);
body { font-family: 'Droid Serif'; }
h1, h2, h3 {
font-family: 'Yanone Kaffeesatz';
font-weight: normal;
}
.remark-code, .remark-inline-code { font-family: 'Ubuntu Mono'; }
</style>
</head>
<body>
<textarea id="source">
class: center, middle
# Blockchain
---
# Intro
George Angel
Infrastructure Architect
---
# What is it?
*Trusted distributed ledger*
Current model:
```
+---+ +---+ +---+
| A | <---> | B | <---> | C |
+---+ +---+ +---+
```
Unit: money, titles, deeds, music, art, scientific discoveries, intellectual property, and even votes
---
# What is it? (II)
With blockchain:
```
+---+ +---+
| A | <---> | C |
+---+ +---+
(bc) (bc)
```
Unit: money, titles, deeds, music, art, scientific discoveries, intellectual property, and even votes
---
# Background
Bitcoin (digital asset and payment system)
- decentralised
- peer-to-peer
- verified public distributed ledger
---
# Components
- Units (bitcoin)
- Blockchain (public ledger) [distributed database]
- Ownership (private/public keys)
- transactions (transfer of ownership)
- hashing of blocks (immutability)
- proof of work (mining [solve difficult arithmetic problems, to create a cost of establishing consensus])
---
# Smart Contracts - after the bitcoin
- Units (bitcoin)
- Blockchain (public ledger) [distributed database]
- Ownership (private/public keys)
- **transactions (transfer of ownership [and more])**
- hashing of blocks (immutability)
- proof of work (mining [solve difficult arithmetic problems, to create a cost of establishing consensus])
---
# Smart Contracts (II)
* data (code of the contract)
* permissions (ownership of contract/asset)
* workflow (order of acting/chain of contracts)
---
# Examples
* multichain (simple, a lot of people hack on it)
* ethereum (smart contract, popular in banking)
* Eris/Tendermint
* hyperledger - started by IBM, donated to Linux Foundation
* R3 Corda - over 50 banks + exchanges that a part of consirtium
- Wrote their own version from the ground up, the contracts are only held by the parties transacting
* BigChainDB [github](https://github.com/bigchaindb/bigchaindb)
---
# Ethereum
*Bitcoin 2.0*
- Built by the people who worked on bitcoin
- Uses smart contracts
- Platform currency: ether
---
# The Good Stuff
- no central control
- redundancy
- immutable
- secure
- visable
- pseudo-anonymous
- open source
- Two levels of trust:
* participants id
* transaction integrity
---
# Risks
- The DAO
* kickstarter in ethereum (my poor approximation)
* Raised 150Mil (the most successful crowfunding ever)
* 3.6 mil ether (~ $72 mil at the time of the hack) currently frozen
More info on the DAO hack: [link](https://medium.com/@pullnews/understanding-the-dao-hack-for-journalists-2312dd43e993#.90e7y8j6w)
---
# Limitations
- Size
* current size of bitcoin blockchain: ~ 88 GB (https://bitinfocharts.com/) [2016-06-29]
* size of ethereum blockchain: 16 GB [2016-06-10]
- Fixes
* Side channel (another blockchain along side that gets "folded" into the main blockchain)
* Sharding (distribute the blockchain between the participants)
---
# How can we use it?
*Ethereum is a solution in search of a problem*
</textarea>
<script src="https://gnab.github.io/remark/downloads/remark-latest.min.js">
</script>
<script>
var slideshow = remark.create();
</script>
</body>
</html>