Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
ビットコインの技術 / Bitcoin Technology
Search
Kenji Saito
PRO
April 11, 2018
Technology
0
290
ビットコインの技術 / Bitcoin Technology
2018年4月11日(水)、ブロックチェーンハブ主催で開催されたブロックチェーンアカデミー「ビットコインの技術」(ブロックチェーン基盤技術【仮想通貨の原型を知る】) にて使用したスライドです。
Kenji Saito
PRO
April 11, 2018
Tweet
Share
More Decks by Kenji Saito
See All by Kenji Saito
関連2群のt検定/独立2群のt検定 / Related 2-group t-test and independent 2-group t-test
ks91
PRO
0
24
A Guide to Paper Writing Support with Generative AI - A Joint Zemi
ks91
PRO
0
6
正規分布と簡単な統計理論/t分布と信頼区間 / Normal distribution, simple statistical theory, t-distribution and confidence intervals
ks91
PRO
0
38
じわじわ迫ってきている自動化社会 (その先にメタ・ネイチャー) / The Slowly Approaching Automated Society (and its beyond: Meta-Nature)
ks91
PRO
0
6
起こりうる誤った推論/平均・分散・標準偏差・自由度 / Possible false inferences, means, variances, standard deviations and degrees of freedom
ks91
PRO
0
55
LaTeX と Overleaf によるショートペーパー作成 / Short paper writing with LaTeX and Overleaf
ks91
PRO
0
18
R を用いた検定(補講) (1) — Welch 検定 / Tests using R (supplementary) (1) - Welch test
ks91
PRO
0
11
R を用いた検定(補講) (2) — カイ二乗検定 / Tests using R (supplementary) (2) - Chi-squared test
ks91
PRO
0
12
R を用いた分析(補講) (1) — 重回帰分析 / Analysis using R (supplementary) (1) - Multiple regression analysis
ks91
PRO
0
10
Other Decks in Technology
See All in Technology
WACATE2024冬セッション資料(ユーザビリティ)
scarletplover
0
190
株式会社ログラス − エンジニア向け会社説明資料 / Loglass Comapany Deck for Engineer
loglass2019
3
31k
Microsoft Azure全冠になってみた ~アレを使い倒した者が試験を制す!?~/Obtained all Microsoft Azure certifications Those who use "that" to the full will win the exam! ?
yuj1osm
2
110
統計データで2024年の クラウド・インフラ動向を眺める
ysknsid25
2
840
MLOps の現場から
asei
6
640
継続的にアウトカムを生み出し ビジネスにつなげる、 戦略と運営に対するタイミーのQUEST(探求)
zigorou
0
520
re:Invent をおうちで楽しんでみた ~CloudWatch のオブザーバビリティ機能がスゴい!/ Enjoyed AWS re:Invent from Home and CloudWatch Observability Feature is Amazing!
yuj1osm
0
120
オプトインカメラ:UWB測位を応用したオプトイン型のカメラ計測
matthewlujp
0
170
How to be an AWS Community Builder | 君もAWS Community Builderになろう!〜2024 冬 CB募集直前対策編?!〜
coosuke
PRO
2
2.8k
10個のフィルタをAXI4-Streamでつなげてみた
marsee101
0
160
どちらを使う?GitHub or Azure DevOps Ver. 24H2
kkamegawa
0
700
podman_update_2024-12
orimanabu
1
260
Featured
See All Featured
[RailsConf 2023 Opening Keynote] The Magic of Rails
eileencodes
28
9.1k
jQuery: Nuts, Bolts and Bling
dougneiner
61
7.5k
VelocityConf: Rendering Performance Case Studies
addyosmani
326
24k
Building a Scalable Design System with Sketch
lauravandoore
460
33k
How To Stay Up To Date on Web Technology
chriscoyier
789
250k
Being A Developer After 40
akosma
87
590k
Large-scale JavaScript Application Architecture
addyosmani
510
110k
Optimizing for Happiness
mojombo
376
70k
The Cost Of JavaScript in 2023
addyosmani
45
7k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
How GitHub (no longer) Works
holman
311
140k
Building a Modern Day E-commerce SEO Strategy
aleyda
38
7k
Transcript
CSO / SFC
[email protected]
— — 2018-04-11 – p.1/38
( ) SFC ( ) CSO (Chief Science Officer) 1993
( ) 2006 ( ) SFC 17 P2P (Peer-to-Peer) 2011 → ( ) — — 2018-04-11 – p.2/38
Proof of Work SegWit — — 2018-04-11 – p.3/38
— — 2018-04-11 – p.4/38
(1) ( ) ⇒ P2P ⇒ ( ) — —
2018-04-11 – p.5/38
(2) (double spending) ( ) ⇒ ⇒ ( ) →
( ) ( ) ⇒ → → ⇒ → — — 2018-04-11 – p.6/38
/ — — 2018-04-11 – p.7/38
/ (1) 2,100 cm3 (cc) 1 1cm3 10 12.5cm3 ⇒
⇒ ( ) — — 2018-04-11 – p.8/38
/ (2) ( ) ( ) ( ) ( )
( ) ( ) → ( ) — — 2018-04-11 – p.9/38
∼ ท൪߸O ท൪߸O ท൪߸O લทͷμΠδΣετ λʔήοτҎԼͰͳ͍ͱ͍͚ͳ͍ Έͩ͠ίʔφʔ μΠδΣετ͕λʔήοτҎԼʹͳΔΑ͏ʹೖΕΔదͳ༰
( ) → — — 2018-04-11 – p.10/38
∼ ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O
ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O ͬͪ͜ͷྺ࢙͕༗ޮ ( ) — — 2018-04-11 – p.11/38
= (virtually) = = = : → ( ) —
— 2018-04-11 – p.12/38
— — 2018-04-11 – p.13/38
— — 2018-04-11 – p.14/38
— — 2018-04-11 – p.15/38
1. 10 ( ) 2. 3. 1 — — 2018-04-11
– p.16/38
End-to-End ( ) ( ) — — 2018-04-11 – p.17/38
- https://blockchain.info/ — — 2018-04-11 – p.18/38
0 and/or “The Times 03/Jan/2009 Chancellor on brink of second
bailout for banks” 2009 1 3 2 https://blockchain.info SEARCH 0 — — 2018-04-11 – p.19/38
(1) (= ) → — — 2018-04-11 – p.20/38
(2) M A 60BTC ( ) SegWit — — 2018-04-11
– p.21/38
SegWit (Segregated Witness; ) (witness) — — 2018-04-11 – p.22/38
SegWit (malleability) https://bitcoincore.org/en/2016/01/26/segwit-benefits/ — — 2018-04-11 – p.23/38
— — 2018-04-11 – p.24/38
Merkle ( ) Digest = SHA-256 × SHA-256 TX —
— 2018-04-11 – p.25/38
Block Header Data Structure Field Description Size (bytes) Version 4
Digest Double SHA-256 value 32 Merkle root Double SHA-256 value 32 Time Seconds (since 1970-01-01T00:00 UTC) 4 Target Compressed format 4 Nonce Appropriate value 4 Merkle root is the digest of all TXs — — 2018-04-11 – p.26/38
OP_RETURN PUSH 0xaa21a9ed 4 (witness) SHA-256 32 Merkle — —
2018-04-11 – p.27/38
Proof of Work ( ) ( ) . . .
: Hashcash (1997) SHA-1 20 ( ) 0 1 1 / — — 2018-04-11 – p.28/38
— — 2018-04-11 – p.29/38
CPU → GPU → FPGA → ASIC ( ) →
→ ( ) BTC — — 2018-04-11 – p.30/38
— — 2018-04-11 – p.31/38
POW ( ) Proof Of Work . . . —
— 2018-04-11 – p.32/38
(2009 1 ∼2018 3 ) 2 → 2 2 →
— — 2018-04-11 – p.33/38
https://bitcoin.org/en/developer-reference — — 2018-04-11 – p.34/38
1 1 ∼ 2 — — 2018-04-11 – p.35/38
A-B — — 2018-04-11 – p.36/38
2 2 ( ) Ripple Path — — 2018-04-11 –
p.37/38
— — 2018-04-11 – p.38/38