Slide 2
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https://speakerdeck.com/ks91
— — 2022-01-26 – p.2/41
Slide 3
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( )
SFC ( )
CSO (Chief Science Officer)
1993 ( )
2006 ( )
SFC
21 P2P (Peer-to-Peer)
2011
2018 2019
VR 2021.7 VR 2021.8 “ALL THESE WORLDS ARE YOURS”
VR 2021.9 & VR 2021.12
( (VR) )
→ ( )
— — 2022-01-26 – p.3/41
Slide 4
Slide 4 text
( )
:
Kalle Rosenbaum , ,
—
(2020)
:
1
— — 2022-01-26 – p.4/41
Slide 5
Slide 5 text
Proof of Work
SegWit Taproot
— — 2022-01-26 – p.5/41
Slide 6
Slide 6 text
— — 2022-01-26 – p.6/41
Slide 7
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(1)
=
( )
⇒ P2P
⇒ ( )
— — 2022-01-26 – p.7/41
Slide 8
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(2)
(double spending) ( )
⇒
⇒ ( )
→ ( )
( ) ( )
⇒ → →
⇒ →
— — 2022-01-26 – p.8/41
Slide 9
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/
— — 2022-01-26 – p.9/41
Slide 10
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/ (1)
2,100 cm3 (cc)
1 1cm3
10
6.25cm3
⇒
⇒ ( )
— — 2022-01-26 – p.10/41
Slide 11
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/ (2)
( )
( )
( )
( )
( ) ( )
→
( )
— — 2022-01-26 – p.11/41
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∼ UTXO
(= ) →
— — 2022-01-26 – p.12/41
Slide 13
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∼
ท൪߸O ท൪߸O ท൪߸O
લทͷμΠδΣετ
λʔήοτҎԼͰͳ͍ͱ͍͚ͳ͍
Έͩ͠ίʔφʔ
μΠδΣετ͕λʔήοτҎԼʹͳΔΑ͏ʹೖΕΔదͳ༰
( )
→
— — 2022-01-26 – p.13/41
Slide 14
Slide 14 text
∼
ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O
ϖʔδ൪߸O ϖʔδ൪߸O ϖʔδ൪߸O
ϖʔδ൪߸O
ͬͪ͜ͷྺ࢙͕༗ޮ
( (= ) )
— — 2022-01-26 – p.14/41
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= (virtually) =
= =
:
→
( )
— — 2022-01-26 – p.15/41
Slide 16
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— — 2022-01-26 – p.16/41
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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
— — 2022-01-26 – p.17/41
Slide 18
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— — 2022-01-26 – p.18/41
Slide 19
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μΠδΣετ
ϒϩοΫ O
ϚΠχϯάใु ݻఆ
खྉ ೖྗͷ߹ܭͱग़ྗͷ߹ܭͷࠩ
.FSLMFΛܭࢉͯ͠
ͦͷϧʔτΛ֨ೲ
͍ͣΕऔҾه͕औΓग़͞Εɺ
ͦͷ࣌ͷਖ਼࢙ʹೖ͍ͬͯͳ͍ͷͳΒ
৽ͨͳϒϩοΫͷதʹ֨ೲ͞ΕΔ
ᶃਖ਼ੑͷอূ
ϏοτίΠϯͰ 6590 ߏ
ᶄଘࡏੑͷূ໌
ϏοτίΠϯͰ࡞ۀূ໌͖ϋογϡνΣʔϯ
ᶅ།Ұੑͷ߹ҙ
ϏοτίΠϯͰ
φΧϞτɾίϯηϯαε
ϒϩοΫ O ϒϩοΫ O ϒϩοΫ O ϒϩοΫ O
ϒϩοΫ O ϒϩοΫ O
μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ
μΠδΣετ μΠδΣετ
#5$
ੜ
औҾ
औҾ औҾ औҾ
ʜʜ
ΑΓ͍ ࡞ۀূ໌
ͷίετ͕ΑΓΘ
Ε͍ͯΔ
νΣʔϯ
͕༗ޮͱͳΔ
μΠδΣετ㱡λʔήοτ
1SPPG0G8PSL
࡞ۀূ໌
աڈͷऔҾग़ྗͷࢀর
σδλϧॺ໊ ެ։ݤ
Ѽઌͱྔ
ίΠϯ
λʔήοτ
ϊϯε
ೖྗ
ೖྗ
ग़ྗ
ग़ྗ
1. 10 ( )
2.
3. 1
— — 2022-01-26 – p.19/41
Slide 20
Slide 20 text
/DLT
ਖ਼ੑͷอূ
ྫ6590ߏͱσδλϧॺ໊
ଘࡏੑͷূ໌
ྫ࡞ۀূ໌͖ϋογϡνΣʔϯ
།Ұੑͷ߹ҙ
ྫφΧϞτɾίϯηϯαε
ϧʔϧͷهड़
ྫ#5$ͷҠస
ɾ
τϥϯβΫγϣϯͷ༰͕վ͟ΜͰ͖ͣɺ
ɾ
ͦͷΞηοτʹؔ͢ΔաڈͷτϥϯβΫγϣϯྻʹরΒͯ͠ໃ६͕ͳ͘ɺ
ɾ
͔ͭɺਖ਼ͳϢʔβʹΑΓೖ͞Ε͍ͯΔ͜ͱΛอূ͢Δ
ɾաڈʹ͋ͬͨτϥϯβΫγϣϯͷূڌΛຣফͰ͖ͣɺ
ɾ
͔ͭɺաڈʹͳ͔ͬͨτϥϯβΫγϣϯͷূڌΛ፻Ͱ͖ͳ͍
ɾໃ६͢Δ;ͨͭͷτϥϯβΫγϣϯ͕ೖ͞Εͨ߹ɺ
ɹ ͍ͣΕ
ؔ༩͢Δશһ͕ಉ͡ยํΛબΜͰྺ࢙ͷதʹҐஔ͚ͮΔ
ɾΞϓϦέʔγϣϯϩδοΫ Կ͕ਖ਼͍͠τϥϯβΫγϣϯ͔ΛܾΊΔ
— — 2022-01-26 – p.20/41
Slide 21
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-
https://blockchain.com/
— — 2022-01-26 – p.21/41
Slide 22
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0 and/or
“The Times 03/Jan/2009 Chancellor on brink of
second bailout for banks”
2009 1 3
2
https://blockchain.com 0
BTC Block
“Hex to ASCII Text Converter”
— — 2022-01-26 – p.22/41
Slide 23
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(1)
(= ) →
— — 2022-01-26 – p.23/41
Slide 24
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(2)
M A 60BTC ( )
SegWit (2017)
— — 2022-01-26 – p.24/41
Slide 25
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SegWit (Segregated Witness; )
(witness) ( )
( TX )
— — 2022-01-26 – p.25/41
Slide 26
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SegWit
(malleability)
https://bitcoincore.org/en/2016/01/26/segwit-benefits/
cf. Taproot ( )(2021)
— — 2022-01-26 – p.26/41
Slide 27
Slide 27 text
— — 2022-01-26 – p.27/41
Slide 28
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Merkle ( )
Digest = SHA-256 × SHA-256
TX ( )
— — 2022-01-26 – p.28/41
Slide 29
Slide 29 text
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
— — 2022-01-26 – p.29/41
Slide 30
Slide 30 text
OP_RETURN PUSH
0xaa21a9ed 4
(witness) SHA-256 32
Merkle
— — 2022-01-26 – p.30/41
Slide 31
Slide 31 text
Proof of Work ( )
( )
. . .
: Hashcash (1997)
SHA-1 20 ( ) 0
1 1
/
— — 2022-01-26 – p.31/41
Slide 32
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— — 2022-01-26 – p.32/41
Slide 33
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CPU → GPU → FPGA → ASIC
( )
→
→ ( )
⇒ BTC
BTC
— — 2022-01-26 – p.33/41
Slide 34
Slide 34 text
— — 2022-01-26 – p.34/41
Slide 35
Slide 35 text
POW
( )
Proof Of Work . . .
— — 2022-01-26 – p.35/41
Slide 36
Slide 36 text
(2009 1 ∼2022 1 )
2 → 2
2 →
→ — — 2022-01-26 – p.36/41
Slide 37
Slide 37 text
https://bitcoin.org/en/developer-reference
— — 2022-01-26 – p.37/41
Slide 38
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1
1 ∼
2
— — 2022-01-26 – p.38/41
Slide 39
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A-B
— — 2022-01-26 – p.39/41
Slide 40
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2
2 ( )
Ripple Path
— — 2022-01-26 – p.40/41
Slide 41
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— — 2022-01-26 – p.41/41