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シン・ブロックチェーン / Truth of Blockchain
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Kenji Saito
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June 21, 2025
Technology
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120
シン・ブロックチェーン / Truth of Blockchain
早稲田大学大学院経営管理研究科「フィンテック ─ 金融革新とインターネット」2025 夏の第5-6回で使用したスライドです。
Kenji Saito
PRO
June 21, 2025
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Transcript
Light and Shadow — Generated by Stable Diffusion 3.5 —
2025 5-6 (WBS) — 2025 5-6 — 2025-06-23 – p.1/57
https://speakerdeck.com/ks91/collections/fintech-2025-summer — 2025 5-6 — 2025-06-23 – p.2/57
( ) 1 6 9 (1) • 2 6 9
(2) • 3 6 16 Web3 (1) • 4 6 16 Web3 (2) • 5 6 23 (1) • 6 6 23 (2) • 7 6 30 (1) 8 6 30 (2) 9 7 7 (1) 10 7 7 (2) 11 7 14 (1) 12 7 14 (2) 13 7 21 (1) 14 7 21 (2) W-IOI ( ) — 2025 5-6 — 2025-06-23 – p.3/57
( 20 ) 1 ↑ 2 ↓ 2025 3 4
(TCP/IP ) 5 6 7 8 ↑ 9 ↓ 2024 ( ) 10 World Wide Web 11 Web API 12 * 13 git GitHub 14 (6/23 ) / (2 ) OK / — 2025 5-6 — 2025-06-23 – p.4/57
( ) Web3 (1) — Web3 (2) — on API
( ) — 2025 5-6 — 2025-06-23 – p.5/57
Web3 (1) — Web3 (2) — ← — 2025 5-6
— 2025-06-23 – p.6/57
— 2025 5-6 — 2025-06-23 – p.7/57
2. (1) (end; ) (2) 2025 6 19 ( )
23:59 JST ( ) Waseda Moodle — 2025 5-6 — 2025-06-23 – p.8/57
. . . . . . 17 15 (6/20( )
) ( ) ( ) ( ) (4 ) ( ) (3 ) (3 ) ( ) (2 ) (1 ) (1 ) (1 ) — 2025 5-6 — 2025-06-23 – p.9/57
A ⇒ (obligation) — 2025 5-6 — 2025-06-23 – p.10/57
A ID DID DID DID ⇒ ( ) Claim( )
DID VC (Verifiable Credentials) issuer issuer DID VC , “Decentralized Identifiers (DID) Verifiable Credentials (VC) ” — 2025 5-6 — 2025-06-23 – p.11/57
I paypay) paypay paypay ( ) ⇒ ( ) AI
— 2025 5-6 — 2025-06-23 – p.12/57
Web3 (1) — ← Web3 NFT DAO — 2025 5-6
— 2025-06-23 – p.13/57
DAO (Decentralized Autonomous Organization) — 2025 5-6 — 2025-06-23 –
p.14/57
DAO ෦ࢿຊˢ͋Δ ɹɹɹɹˣͳ͍ தԝʹࣗಈ ɹɹɹɹɹWT ɹɹɹɹɹɹதԝʹਓؒ શͳ "* σʔϞϯ˞ ϑΥʔϥϜ˞
XFC αʔϏε ϩϘοτΛ %"0 %"QQ˞ ݹయత৫ ɹɹɹɹɹपลʹਓؒ ɹɹɹɹWT पลʹࣗಈ ˞%"QQεϚʔτίϯτϥΫτʹΑΔΞϓϦέʔγϣϯ %FDFOUSBMJ[FE"QQ ˞ϑΥʔϥϜਓʑ͕ಛఆͷʹ͍ͭͯٞͨ͠ΓใΛަͨ͠Γ͢Δ ˞σʔϞϯόοΫάϥϯυͰՔಇ͠ ΠϕϯτʹࣗಈతʹରԠ͢ΔϓϩάϥϜ . . . Buterin DAO (2014) — 2025 5-6 — 2025-06-23 – p.15/57
DAO $ brownie bake dao README https://github.com/brownie-mix/dao-mix ( OpenZeppelin )
( ) ( DAO ) ( ) DAO . . . (2024 4 ) DAO ( ) — 2025 5-6 — 2025-06-23 – p.16/57
DAO Bitcoin DAO → DAO Ethereum DAO → . .
. DAO ( ) ( ) DAO → . . . ( ) ↑ ( ) ← — 2025 5-6 — 2025-06-23 – p.17/57
— Web 3.0 ( ) ( ) ( . .
. ) ( ) . . . DAO . . . — 2025 5-6 — 2025-06-23 – p.18/57
Web3 (2) — — 2025 5-6 — 2025-06-23 – p.19/57
N NFT ⇒ ( ) NFT NFT — 2025 5-6
— 2025-06-23 – p.20/57
Y NFT NFT NFT ETH ⇒ NFT Ethereum ETH —
2025 5-6 — 2025-06-23 – p.21/57
H DAO “ ” ⇒ ( ) DAO — 2025
5-6 — 2025-06-23 – p.22/57
— 2025 5-6 — 2025-06-23 – p.23/57
(1) ( ) 3 — 2025 5-6 — 2025-06-23 –
p.24/57
(2) ↓ (1) (2) ( ) (3) ( ) bitcoin
— 2025 5-6 — 2025-06-23 – p.25/57
(by Satoshi Nakamoto) Satoshi ( ) (block; , ) ←
(chain; ) ← — 2025 5-6 — 2025-06-23 – p.26/57
Bitcoin . . . Bitcoin YouTuber ( ) ( )
( ) ( ) Bitcoin ( ) YouTube, Zoom, etc. ??? YouTube Zoom ( ) — 2025 5-6 — 2025-06-23 – p.27/57
Bitcoin (1) Bitcoin = ( ) Bitcoin ⇒ P2P ⇒
( ) — 2025 5-6 — 2025-06-23 – p.28/57
Bitcoin (2) (double spending) ( ) ⇒ ⇒ ( )
→ ( ) ( ) ( ) ⇒ → → ⇒ → — 2025 5-6 — 2025-06-23 – p.29/57
— — 2025 5-6 — 2025-06-23 – p.30/57
Bitcoin ϏοτίΠϯωοτϫʔΫ ɾ ճͷʮ࠾۷ʯྔ ຖʹݮ ɾ߹ܭ ສ
#5$ ·Ͱ औҾͷొ खྉ खྉ औҾͷঝೝ ϚΠχϯά࣌ ϚΠχϯά ࠾۷ ֬తաఔ ฏۉ ͓͖ʹޭ ૹۚࢦ֤͕ࣔࣗͭ ϓϥΠϕʔτΩʔͰ ແͨ͘͠Β࠶ൃߦෆՄ ϚΠφʔ ࠾۷ऀ ࢧ͍ɾ྆ସ ͳͲͷܦࡁ׆ಈ ར༻ऀ ϒϩοΫνΣʔϯ ݩா Πϯλʔωοτ্ͷԾωοτϫʔΫ ʜ ˞#5$ϏοτίΠϯͷ୯Ґ #5$ ରԠ ϒϩοΫ ϒϩοΫ ϒϩοΫ औҾ ૹۚ औҾͷه ΞυϨε Ѽઌ ϓϥΠϕʔτΩʔ ຊਓͷূ໌ — 2025 5-6 — 2025-06-23 – p.31/57
— 2025 5-6 — 2025-06-23 – p.32/57
/ (1) Bitcoin 2,100 cm3 (cc) 1 1cm3 10 3.125cm3
⇒ ⇒ ( ) — 2025 5-6 — 2025-06-23 – p.33/57
/ (2) ( ) ( ) ( ) ( )
( ) → Bitcoin ( ) — 2025 5-6 — 2025-06-23 – p.34/57
∼ UTXO (= ) → — 2025 5-6 — 2025-06-23
– p.35/57
∼ ท൪߸O ท൪߸O ท൪߸O લทͷμΠδΣετ λʔήοτҎԼͰͳ͍ͱ͍͚ͳ͍ Έͩ͠ίʔφʔ μΠδΣετ͕λʔήοτҎԼʹͳΔΑ͏ʹೖΕΔదͳ༰
( ) → — 2025 5-6 — 2025-06-23 – p.36/57
∼ ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O
ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O ͬͪ͜ͷྺ࢙͕༗ޮ ( (= ) ) — 2025 5-6 — 2025-06-23 – p.37/57
ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O ϒϩοΫ൪߸O
ϒϩοΫ൪߸O ϒϩοΫ൪߸O ͍ͪΜهɾॻ͖͑ͷίετ͕ߴ͍ྺ࢙ ࠷վ͟Μ͠ʹ͍͘ྺ࢙ ͕༗ޮ ͻͱͭखલͷϒϩοΫͷ ʮμΠδΣετʯ σδλϧॺ໊͞Εͨ ʮτϥϯβΫγϣϯ औҾ ʯ ϒϩοΫΛ࡞ΔͨΊʹɺͦͷʮμΠδΣετʯ͕͋ΔҎԼͱ͍͏݅Λຬͨͨ͠Γ 1SPPGPG8PSL Ծ௨՟ͷ࣋ͪʹԠͨ͡ݖརΛͬͨථͰউͬͨΓ 1SPPGPG4UBLF ͢Δඞཁ͕͋Δ ίετ͕͔͔Δ ϒϩοΫΛ࡞ΔਓͦͷதʹࣗʹѼͯͨ Ծ௨՟ͰͷใुΛॻ͖ࠐΉ͜ͱ͕Ͱ͖ɺ ͦͷϒϩοΫ͕༗ޮͳྺ࢙ͷதʹ͋Δ߹ʹ ݶΓใु༗ޮͱͳΔ τϥϯβΫγϣϯͷଘࡏΛ֬ೝ͢Δ ͨΊͷޮతͳํ๏͕ఏڙ͞ΕΔ ਖ਼ੑ ଘࡏੑ །Ұੑ Proof of Work ( ) . . . → — 2025 5-6 — 2025-06-23 – p.38/57
0 and/or Bitcoin “The Times 03/Jan/2009 Chancellor on brink of
second bailout for banks” 2009 1 3 2 https://www.blockchain.com/explorer 0 BTC Block “Hex to ASCII Text Converter” — 2025 5-6 — 2025-06-23 – p.39/57
: ( ( ) ) ( ) — 2025 5-6
— 2025-06-23 – p.40/57
(Hyperledger ) ( ) ( ) ( ) ( )
IoT / / ( , ) — 2025 5-6 — 2025-06-23 – p.41/57
: Bitcoin . . . : Proof of Existence, Everledger,
. . . ( ) ( ) / × = NFT (Non Fungible Token) — 2025 5-6 — 2025-06-23 – p.42/57
( ) จ ॻ จ ॻ จ ॻ
จ ॻ จ ॻ O μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ حͷ߹ ෳ͢Δ ɾจॻ ΛಘͨΫϥΠΞϯτɺಉ࣌ʹূ໌ཁૉͱͯ͠ɺϒϧʔͰࣔ͞ΕΔμΠδΣετͱ֤ʑ͕ࠨӈͷͲͪΒʹҐஔ͢Δ͔Λड͚औΔɻ ɾΫϥΠΞϯτจॻ ͷμΠδΣετ͔Β࢝Ίͯɺ࿈͖݁͢Ұ࿈ͷμΠδΣετΛΔ͜ͱʹͳΔͷͰɺϚʔΫϧϧʔτʹࢸΔ·Ͱͷ ɹܭࢉΛ࠶ݱͰ͖ɺಘΒΕͨϚʔΫϧϧʔτ͕ϒϩοΫνΣʔϯʹه͞Ε͍ͯΔͱҰக͢Δ͜ͱΛ֬ೝͰ͖Δɻ ɾͦͷܭࢉݪཧͷཧղͱඞཁͳใ͕͋Ε୭Ͱ࠶ݱͰ͖Δ จॻ ͷଘࡏͱͦͷ༰ূ໌͞ΕΔɻ ˞μΠδΣετݩͷσʔλ͕ ɹϏοτͰҟͳΔͱશ͘ҟͳΔ ɹͱͳΓɺ·ͨɺμΠδΣετ ɹ͔ΒݩͷσʔλΛਪଌ͢Δ͜ͱ ɹͰ͖ͳ͍ɻ ˞ઍɾສͷจॻΛϚʔΫϧʹͯ͠ ɹͦͷͷߴ͞ߴʑʙ ఔ ه͢Δ ಡΈग़ͤΔ ূ໌Λ ඞཁͱ͢Δऀʹ ։ࣔ͞ΕΔใ ެ։͞ΕΔใ ϚʔΫϧϧʔτ Ϛ ồ Ϋ ϧ γ ε ς Ϝ ͕ อ ͠ ֤ Ϣ ồ β ʹ ෦ త ʹ ͑ Δ ʜʜ ʜʜ ʜʜ ʜʜ ʜʜ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ ϒϩοΫνΣʔϯ ʜ ʜ — 2025 5-6 — 2025-06-23 – p.43/57
: ⇒ LINE → → ( ) ( ) ⇒
( ) → → → . . . — 2025 5-6 — 2025-06-23 – p.44/57
( ( )) ( ) / / — 2025 5-6
— 2025-06-23 – p.45/57
— 1. ( ) 2. ( ) 3. ( )
— 2025 5-6 — 2025-06-23 – p.46/57
— 2025 5-6 — 2025-06-23 – p.47/57
(2009 1 ∼2025 6 ) 2 → 2 2 →
→ — 2025 5-6 — 2025-06-23 – p.48/57
( ) -12 -9 -7 -5 -3 -1 1 3
5 7 9 11 Time Zone (UTC-relative) Capacity (GW) Bitcoin 0 20 40 60 80 100 120 140 ( — Bitcoin 19GW) Solar power by country ( ) 17GW (13 ) Bitcoin 13 Bitcoin 1 4 4.25GW 29 UTC — 2025 5-6 — 2025-06-23 – p.49/57
10 ATM 1 ATM 1 : http://www.slideshare.net/yamaz2/ss-58813038 ⇒ ( (
) ) — 2025 5-6 — 2025-06-23 – p.50/57
— 2025 5-6 — 2025-06-23 – p.51/57
The DAO ( ) Ethereum The DAO Split ( )
360 ETH (50∼60 ) (2016/6/17) ( ) ( ; ) (2016/7/20 ) — 2025 5-6 — 2025-06-23 – p.52/57
( ) ( ) ( vs. ) ( ) (
) ( ) ⇒ ( : BBc-1, BBc-2) : : — 2025 5-6 — 2025-06-23 – p.53/57
SF — 2025 5-6 — 2025-06-23 – p.54/57
— 2025 5-6 — 2025-06-23 – p.55/57
3. (1) SF (2) 2023 6 26 ( ) 23:59
JST ( ) Waseda Moodle — 2025 5-6 — 2025-06-23 – p.56/57
— 2025 5-6 — 2025-06-23 – p.57/57