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ブロックチェーンとは何か?
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Sota Watanabe
July 15, 2018
Technology
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ブロックチェーンとは何か?
Sota Watanabe
July 15, 2018
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Transcript
1. ͳͥBC͕ඞཁͳͷ͔ 1. ैདྷͷऔҾ 2. ैདྷͷ 3. BCͷղܾੑ 2. جຊతͳΈ
1. લఏ݅ 2. ϓϩηε 3. ු͔ͼ্͕Δٙ 4. 51%߈ܸ ϒϩοΫνΣʔϯͱԿ͔ ࢀরݩɿWTF is The Blockchain? ʢhttps://hackernoon.com/wtf-is-the-blockchain-1da89ba19348ʣ
1. ͳͥϒϩοΫνΣʔϯ͕ඞཁͳͷ͔ BCʹΑͬͯୈࡾऀػؔʹґଘͤͣͱ৴པΛੜΈग़͢͜ͱ͕Ͱ͖ΔΑ͏ʹͳͬͨɻ Trust without 3rd party
1.1. ैདྷͷऔҾ ೋऀؒʹ͓͚ΔऔҾʹ͓͍ͯୈࡾऀػؔʢex. ۜߦʣ͕ؒΛऔΓ࣋ͪެਖ਼ੑΛอͭ $100 to B I send $100
from A to B I got $100 A͔ΒBʹ$100ૹۚ͢Δ߹ A͞Μ B͞Μ ۜߦ $100 $100
1.2. ैདྷͷ ୈࡾऀػ͕ؔԿΒ͔ͷཧ༝Ͱμϯɾϛεɾҙਤతͳૢ࡞Λߦ͑ެਖ਼ͳऔҾ͕ߦ͑ͳ͘ͳΔ $100 to B I send $50 from
A to B Why $50? A͔ΒBʹ$100ૹۚ͢Δ߹ A͞Μ B͞Μ ۜߦ $100 $50
1.3. Block Chainͷղܾੑ ϒϩοΫνΣʔϯୈࡾऀػؔʹཔΔ͜ͱແ͘औҾͷ৴པੑɾެਖ਼ੑΛ࣮ݱ͢Δ͜ͱ͕ग़དྷΔ Trust without 3rd party
2.1. લఏ݅ BC3ਓҎ্ͷωοτϫʔΫ͕ଘࡏ͠ɺͦΕͧΕ͕ه͢ΔͷΛ͍࣋ͬͯΔڥΛఆ͢Δ ωοτϫʔΫ هா
2.2. ϓϩηε େ͖͘4ͭͷಈ࡞ʹΑͬͯϒϩοΫνΣʔϯΓཱ͍ͬͯΔ 1. औҾͷൃੜ 2. औҾͷه 3. هͷܧଓ 4.
৽͍͠هͷ༻ҙ
2.2.1 औҾͷൃੜ ೋऀؒͰऔҾ͕ߦΘΕΔɻҎԼͷྫͰ#2͔Β#9ͷૹ͕ۚऔҾͷ༰ɻ $10 औҾͷൃੜ
2.2.2 औҾͷه औҾ͕͋ͬͨ͜ͱɾऔҾͷ༰ʢ#2→#9 $10ૹۚʣΛपғʹରͯ͠Β֤ͤͯࣗʹهͤ͞Δɻ $10 औҾͷൃੜ औҾΛه
2.2.3 هͷܧଓ ୭͔ͷऔҾͷʹશһ͕֤ࣗʹه͍ͯ͘͠ಈ࡞Λهϖʔδ͕ͳ͘ͳΔ·Ͱଓ͚Δɻ औҾܧଓ ϖʔδͷݶք·Ͱه
2.2.4 ৽͍͠هͷ༻ҙ هϖʔδ͕ͳ͘ͳͬͨΒਖ਼͍͠ϓϩηεͰϖʔδΛอଘ͠ɺهாͷ࣍ϖʔδΛ༻ҙ͢Δɻ
2.2.4.1 ਖ਼͍͠อଘͷํ๏ ΠϯϓοτΛՃ͠Ξτϓοτ͢ΔϚδοΫϚγʔϯʢਖ਼͘͠ϋογϡؔʣΛ༻ҙ͢Δɻ
2.2.4.2 Ϛγʔϯͷϧʔϧ Ξτϓοτ͔ΒΠϯϓοτΛಋ͘͜ͱͰ͖ͳ͍Ұํ௨ߦʹͳ͍ͬͯΔɻ Ұํ௨ߦ
2.2.4.3 ਖ਼͍͠อଘ൪߸ Πϯϓοτ༰ʹΛՃ͑ͯɺܾΊΒΕͨ൪߸Λग़ྗͰ͖ͨͷΛਖ਼͍͠อଘ൪߸ʢ1ͭʣͱ͢Δɻ
2.2.4.4 อଘ൪߸ͷݟ͚ͭํ Ϛγʔϯ͕Ұํ௨ߦͷͨΊਖ਼͍͠อଘ൪߸Λ୳ͨ͢Ίʹͻͨ͢ΒΠϯϓοτΛߦ͏͔͠ͳ͍ɻ
2.2.4.5 อଘ൪߸ͷڞ༗ ͦͷΠϯϓοτΛΈΜͳͰߦ͍ɺਖ਼͍͠อଘ൪߸Λݟ͚ͭͨਓ͕ωοτϫʔΫશһʹڞ༗͢Δɻ 31983 !
2.2.4.6 ਖ਼͠͞ͷ֬ೝ ڞ༗͞Εͨอଘ൪߸͕ਖ਼͍͔͠ʢٻΊ͍ͯΔΞτϓοτ͕ग़ྗ͞ΕΔ͔ʣΛ֬ೝ͢Δ 31983 correct?
2.2.4.7 ͍ํ ਖ਼͍͜͠ͱ͕֬ೝͰ͖ͨΒอଘ͕ߦΘΕΔɻͭ·ΓऔҾ͕ࣄ࣮Ͱ͋Δͱ͞ΕΔɻ 31983 is correct!
2.2.4.8 ͍ํ هΛվ͟Μ͢Δͱग़ྗ͕มΘΔͨΊɺਖ਼͍͠อଘ൪߸มΘΓɺશମ͔Βड͚ೖΕΒΕͳ͍ɻ That is wrong!
2.3. ු͔ͼ্͕Δٙ هϖʔδ͕ͳ͘ͳͬͨΒਖ਼͍͠ϓϩηεͰϖʔδΛอଘ͠ɺ࣍ͷϖʔδΛ༻ҙ͢Δɻ Q. ਖ਼͍͠൪߸Λ୳͢ಈػԿͳͷ͔ʁ A. ૣ͘ݟ͚ͭͨਓʹใु͕ೖΓ·͢ɻ Q. ݹ͍ใΛվ͟Μ͠Α͏ͱͨ͠ΒͲ͏ͳΓ·͔͢ A.
ϚγʔϯͷΠϯϓοτͱͯ͠લͷϖʔδͷாͷใ͕ೖΕΒΕ·͢ɻͦͷͨΊ վ͟Μ͕͋ΔͱΞτϓοτ͕มΘͬͯ͠·͍ɺҟͳΔΞτϓοτશମͰ ίϯηϯαε͕ಘΒΕ·ͤΜɻΑͬͯࣄ࣮ͱͯ͠ೝΊΒΕ·ͤΜɻ
2.4 51%߈ܸ ωοτϫʔΫͷҎ্ͷਓ͕ؒڏِͷใΛਖ਼͍͠ͱ͢ΔखॱΛऔΕվ͟Μ͕Մೳɻ That is correct! It isn’t correct! It
isn’t correct!