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仮想通貨bitCoinの仕組みと課題
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Yuji Horiguchi
January 24, 2018
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仮想通貨bitCoinの仕組みと課題
仮想通貨bitCoinの仕組みと課題についてまとめました
Yuji Horiguchi
January 24, 2018
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Transcript
IPSJHVDIJZVKJ!LJSBCBKQ ງޱ༟࢘ Ծ௨՟CJU$PJOͷ Έͱ՝ ˞Ծ௨՟ʹΑͬͯΈҟͳΓ·͕͢ɺCJU$PJOΛલఏʹઆ໌͠·͢
IPSJHVDIJZVKJ!LJSBCBKQ ࢿΛਪ͢Δ༰Ͱ͋Γ·ͤΜ ࢿࣗݾͰ͢ ༰ͷਖ਼֬ੑΛอূ͢ΔͷͰ͋Γ·ͤΜ
IPSJHVDIJZVKJ!LJSBCBKQ Ծ௨՟CJU$PJO
IPSJHVDIJZVKJ!LJSBCBKQ ։ൃऀ ατγɾφΧϞτ ຊਓͰͳ͍ͱݴΘΕ͍ͯΔ ະͩʹ୭ͳͷ͔ಛఆ͕Ͱ͖͍ͯͳ͍ ਪఆສCJU$PJOΛอ༗͍ͯ͠ΔͱݴΘΕ͍ͯΔ
IPSJHVDIJZVKJ!LJSBCBKQ ༻։࢝ ݄
IPSJHVDIJZVKJ!LJSBCBKQ ൃߦ্ݶ ສCJU$PJO ΠϯϑϨϦεΫ͕ͳ͍ɻ୭͔ͷҙࢥͰڙڅྔΛௐͰ͖ͳ͍
IPSJHVDIJZVKJ!LJSBCBKQ ࠷খ୯Ґ 0.00000001BTC = 1satoshi ࠷খ୯ҐΛTBUPTIJͱݴ͍·͢ɻ։ൃऀφΧϞτατγͷ໊લ͕༝དྷ CJUDPJOສԁҎ্͠·͕͢ɺখֹ͔ΒͰऔҾૹ͕ۚͰ͖Δ
IPSJHVDIJZVKJ!LJSBCBKQ ιʔείʔυ͕Φʔϓϯ ୭Ͱιʔείʔυ͕֬ೝͰ͖ΔͷͰѱҙͷ͋Δίʔυ͕ ೖΓࠐΉϦεΫ͕গͳ͍
IPSJHVDIJZVKJ!LJSBCBKQ ࢄཧʢ୭ͰνΣοΫͰ͖Δʣ ୭ཧ͠ͳ͍ վ͟ΜͰ͖ͳ͍ CJU$PJOͷج൫ٕज़ ϒϩοΫνΣʔϯͷಛ
IPSJHVDIJZVKJ!LJSBCBKQ ࢄཧ
IPSJHVDIJZVKJ!LJSBCBKQ ࢄཧ தԝαʔόʔΛ࣋ͨͣੈքதʹ͋Δ ίϯϐϡʔλʔಉ࢜ͷωοτϫʔΫͰՔಇ͍ͯ͠Δ
IPSJHVDIJZVKJ!LJSBCBKQ ࠃՈ͕ഁͯ͠CJU$PJOഁ͠ͳ͍ ࠃՈ͕ൃߦ͢Δ௨՟ΑΓ৴༻ੑ͕ߴ͍ͷͰͳ͍͔ʁ
IPSJHVDIJZVKJ!LJSBCBKQ ୭ཧ͠ͳ͍
IPSJHVDIJZVKJ!LJSBCBKQ ୭ཧ͠ͳ͍γεςϜ ʢඇதԝूݖ˞ʣ ୭͔ͷҙਤͰίϯτϩʔϧ͞ΕΔ͜ͱ͕ͳ͍ தԝͷࡦʹΑͬͯϧʔϧ͕มߋ͞ΕͨΓɺແݶʹൃߦͰ͖Δ๏ఆ௨՟ΑΓ ৴པͰ͖ΔͷͰͳ͍͔ʁ
IPSJHVDIJZVKJ!LJSBCBKQ վ͟ΜͰ͖ͳ͍
IPSJHVDIJZVKJ!LJSBCBKQ ϒϩοΫνΣʔϯͰ औҾཱ͕͢ΔྲྀΕ͕Θ͔Δͱ վ͟ΜͰ͖ͳ͍Έ͕Θ͔Δ
IPSJHVDIJZVKJ!LJSBCBKQ ϒϩοΫ औҾ औҾ औҾ औҾ औҾ औҾ औҾ
औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫ աڈͷऔҾؚΊͯ͢ͷऔҾ͕ϒϩοΫʹه͞ΕͷΑ͏ʹͭͳ͕Δɺ ࢄཧ͞Ε͍ͯΔڊେͳா ˞ࢄܕாͱݺΕΔ ࢀߟαΠτ Ծ௨՟ͷ͍࢝͞͠ΊํϒϩοΫνΣʔϯͷਖ਼ੑΛ֬ೝ͢ΔͨΊͷॏཁͳखଓ͖ ϒϩοΫνΣʔϯҰํʹྲྀΕΔຊͷ ϒϩοΫνΣʔϯͷΠϝʔδ
IPSJHVDIJZVKJ!LJSBCBKQ औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ
औҾ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϚΠφʔ͕ϚΠχϯάΛߦ͏ͱ औҾใΛೖΕΔϒϩοΫ͕ Ճ͞ΕΔɻͦͷ݁ՌऔҾཱ͕͢Δ औҾ औҾ औҾ ϒϩοΫͷ ݕূͱঝೝ ʢϚΠχϯάʣ ϚΠφʔʢ࠾۷ۀऀʣ औҾใΛ ૹ৴ ϒϩοΫ͕ Ճ͞ΕΔͱऔҾ͕ ཱʢૹۚྃʣ େͳԋࢉॲཧ ʹΑΔݕূ ࢀߟαΠτ Ծ௨՟ͷ͍࢝͞͠ΊํϒϩοΫνΣʔϯͷਖ਼ੑΛ֬ೝ͢ΔͨΊͷॏཁͳखଓ͖
IPSJHVDIJZVKJ!LJSBCBKQ ϚΠχϯάͬͯԿʁ ?
IPSJHVDIJZVKJ!LJSBCBKQ ϚΠχϯάίϯϐϡʔλ͕͋Ε ୭ͰͲ͜ͰͰ͖Δɻ ϚΠχϯάΛ͢Δਓ৫ΛϚΠφʔͱݴ͏
IPSJHVDIJZVKJ!LJSBCBKQ ϚΠχϯάͷใुͱͯ͠ CJU$PJOΛ֫ಘͰ͖ΔͷͰϚΠφʔ ϚΠχϯάΛߦ͏ ϚΠφʔ ϚΠχϯά ใुʴखྉ ࢀߟαΠτ Ծ௨՟ͷ͍࢝͞͠ΊํϒϩοΫνΣʔϯͷਖ਼ੑΛ֬ೝ͢ΔͨΊͷॏཁͳखଓ͖
IPSJHVDIJZVKJ!LJSBCBKQ ίϯϐϡʔλʔͰΫΠζΛղ͍ͨউऀ͕ϒϩοΫΛՃ͢ΔݖརΛ֫ಘ͢Δ େͳܭࢉྔ͕ඞཁͳͨΊେ͖ͳܭࢉೳྗʢϋογϡϨʔτʣΛ࣋ͭͷ͕༗ར େखϚΠφʔΫΠζʹউͭͨΊߴੑೳͳίϯϐϡʔλʔΛେྔʹͬͯϚΠχϯά͢Δ ϚΠχϯά؆୯ʹݴ͏ͱେͳ ܭࢉྔ͕ඞཁͳΫΠζΛղ͘࡞ۀ ܭࢉೳྗ͕͍ͱ উͯΔՄೳੑ͕͍ େͳܭࢉྔ
ࢀߟαΠτ Ծ௨՟ͷ͍࢝͞͠ΊํϒϩοΫνΣʔϯͷਖ਼ੑΛ֬ೝ͢ΔͨΊͷॏཁͳखଓ͖
IPSJHVDIJZVKJ!LJSBCBKQ ΫΠζͷউऀ͕ਖ਼͍͠ͱओு͢Δ ϒϩοΫ͕࠾༻͞ΕΔ͕ɻɻɻ औҾ औҾ औҾ औҾ औҾ औҾ
ϒϩοΫ ϒϩοΫ ϒϩοΫ औҾ औҾ औҾ ਖ਼͍͠ ϒϩοΫͩΑ ΫΠζͷউऀ ΫΠζͷഊऀ ࢀߟαΠτ Ծ௨՟ͷ͍࢝͞͠ΊํϒϩοΫνΣʔϯͷਖ਼ੑΛ֬ೝ͢ΔͨΊͷॏཁͳखଓ͖
IPSJHVDIJZVKJ!LJSBCBKQ ࢀߟαΠτ Ծ௨՟ͷ͍࢝͞͠ΊํϒϩοΫνΣʔϯͷਖ਼ੑΛ֬ೝ͢ΔͨΊͷॏཁͳखଓ͖ ΫΠζͷਖ਼ղΛग़ͨ͢Ίʹ࣮ߦ͞Εͨ ੈքશମͷܭࢉྔͷաͷঝೝΛ ಘΒΕͳ͚Εਖ਼ࣜͳϒϩοΫʹͳΒͳ͍ औҾ औҾ औҾ
औҾ औҾ औҾ ϒϩοΫ ϒϩοΫ ϒϩοΫ औҾ औҾ औҾ ֬ೝ͚ͨ͠Ͳ ͔֬ʹਖ਼ࣜͳ ϒϩοΫͩʂ Ҏ্ͷঝೝ ਖ਼ࣜͳϒϩοΫʹͳΔͱऔҾཱ͕͢Δ
IPSJHVDIJZVKJ!LJSBCBKQ ਖ਼ࣜͳϒϩοΫ͕Ճ͞ΕΔͱ উऀʹใुͱͯ͠CJU$PJO͕ൃߦ͞ΕΔ উऀCJU$PJOͱ खྉΛ֫ಘ ใुʴखྉ खྉ֫ಘͰ͖Δ ഊऀ Կ֫ಘͰ͖ͳ͍
ࢀߟαΠτ Ծ௨՟ͷ͍࢝͞͠ΊํϒϩοΫνΣʔϯͷਖ਼ੑΛ֬ೝ͢ΔͨΊͷॏཁͳखଓ͖
IPSJHVDIJZVKJ!LJSBCBKQ ͜ͷऔҾݕূํࣜΛ ϓϧʔϑɾΦϒɾϫʔΫ ʢQSPPGPGXPSLɺ108ʣͱݺͿ ˞Ծ௨՟ʹΑͬͯݕূํ͕ࣜҟͳΔ
IPSJHVDIJZVKJ!LJSBCBKQ ࠾۷ಓ۩ʢίϯϐϡʔλʣΛͬͯ ۚʢCJU$PJOʣΛ ۷ΓͯΔ࡞ۀʹͳͧΒ͑ɺ ϚΠχϯάʢ࠾۷ʣͱݺΕ͍ͯΔ
IPSJHVDIJZVKJ!LJSBCBKQ ҎલݸਓͰϚΠχϯάͯ͠ CJU$PJOΛ֫ಘ͢Δ͜ͱͰ͖͕ͨɻɻɻ ݱࡏେنͳϚΠχϯάࣄۀऀ͕ଟ͘ ͘͠ͳ͖͍ͬͯͯΔ ࢀߟαΠτ Gigazine:ߴಅ͠ଓ͚ΔԾ௨՟BitcoinΛ۷Δੈք࠷େͷϚΠχϯάʹજೖɺ2ສ5000ͷϚγϯΛࠅ͢Δ࠾۷ݱͷڪΔ͖ ࣮ଶʹഭΔ
IPSJHVDIJZVKJ!LJSBCBKQ ϚΠχϯάͬͯඞཁ͋Δͷʁ ?
IPSJHVDIJZVKJ!LJSBCBKQ ϚΠχϯάʹΑͬͯϒϩοΫνΣʔϯͷ ηΩϡϦςΟͱऔҾͷ৴པੑ͕อͨΕΔ
IPSJHVDIJZVKJ!LJSBCBKQ औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ
औҾ ِ ِ ِ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫ औҾΛվ͟Μ͠Α͏ͱͯ͠ ϚΠχϯά࡞ۀશମͷॲཧͷաͷ ঝೝ͕ͳ͚ΕϒϩοΫΛՃͰ͖ͳ͍ औҾ औҾ औҾ ঝೝ աҎ্ͷঝೝΛ ಘΒΕͳ͍ ঝೝ
IPSJHVDIJZVKJ!LJSBCBKQ औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ
औҾ ِ ِ ِ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫ ࠷͍νΣʔϯ͕ਖ਼͍͠ͱஅ͞ΕΔ औҾ औҾ औҾ ਖ਼͍͠νΣʔϯ
IPSJHVDIJZVKJ!LJSBCBKQ औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ
औҾ ِ ِ ِ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫͲΜͲΜՃ͞ΕΔͨΊɺ ෆਖ਼ͳϒϩοΫΛՃ͢Δͷ ݱ࣮తʹෆՄೳ औҾ औҾ औҾ վ͟ΜΛࢼΈ͍ͯΔؒʹ ϒϩοΫͲΜͲΜ Ճ͞Εͯ͠·͏ ਖ਼͍͠νΣʔϯ ِ ِ ِ ϒϩοΫΛมߋͯ͠ ಉ͡ϚΠχϯάͷ࡞ۀʹΑͬͯ Ճ͍͔ͯ͠ͳ͍͚ͯ͘ͳ͍
IPSJHVDIJZVKJ!LJSBCBKQ աڈؚΊͯ͢ͷऔҾ͕ެ։͞Ε͓ͯΓ ୭ͰνΣοΫͰ͖Δ ϒϩοΫ औҾ औҾ औҾ औҾ औҾ
औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫ ୭ͰνΣοΫͰ͖Δ͔Β͞Βʹվ͟Μ͍͠
IPSJHVDIJZVKJ!LJSBCBKQ औҾ औҾ औҾ औҾ औҾ औҾ औҾ औҾ
औҾ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϒϩοΫ ϚΠφʔ͕୭Ͱ͋ͬͯऔҾཱ͕͢Δ ϝϦοτ͋ΔʢτϥετϨεʣ औҾ औҾ औҾ औҾཱ ϚΠφʔʢ࠾۷ۀऀʣ औҾ ཱ͠ͳ͍ ҰൠతͳऔҾͰԿऀ͔Θ͔Βͳ͍ਓʹऔҾΛཔΉ͜ͱͰ͖ͳ͍ CJU$PJOؒతʹऔҾॲཧΛߦ͍ͬͯΔϚΠφʔ͕୭Ͱ͋ͬͯऔҾཱ͕͢Δ
͜ͷϒϩοΫνΣʔϯٕज़ ͋ΒΏΔऔҾʹԠ༻͕ظ͞Ε͍ͯΔ ৯τϨʔαϏϦςΟɺอݥɺෆಈ࢈ɺ ΞʔτɺϔϧεέΞɺ ΧʔγΣΞϦϯάɺνϟϦςΟʔʜFUD ࢀߟαΠτ 5FDI(0ϒϩοΫνΣʔϯΛԠ༻ֵͨ͠৽తαʔϏεબ
Ծ௨՟ʢCJU$PJOʣͷ՝
Ձ͕ෆ҆ఆ Ձ͕ෆ҆ఆͳͨΊɺͩΕ௨՟ͱ͓ͯ͠͏ͱࢥΘͳ͍ ͰʙҎ্Ձ͕֨มಈ͢Δ
ిྗͷ ϚΠχϯάίϯϐϡʔλΛͬͯେͳܭࢉॲཧΛߦ͏ɻ CJU$PJOͰ͜ͷ࡞ۀʹΑͬͯফඅ͞ΕΔిྗੈքͰඞཁͱ͞ΕΔిྗͷ ʹͳΔɻڥͷӨڹɺඞཁͳిྗ͕ࠓޙ͞Βʹେ͖͘ͳΔͱ ༧͞ΕΔͨΊɺ࣋ଓੑʹ՝͕͋ΔͱݴΘΕ͍ͯΔ ࢀߟαΠτ $PJO1PTUϏοτίΠϯϚΠχϯάͷফඅిྗ͕ੈքϲࠃͷ֤ফඅྔΑΓଟ͍ݱঢ়
ࠃՈʹΑΔن੍ ௨՟ΛࠃՈ͕ίϯτϩʔϧͰ͖ͳ͘ͳΔͨΊɺن੍͞ΕΔ தࠃͳͲͰن੍͕ਐΜͰ͍Δ ن੍͕ਐΉ͜ͱϧʔϧ͕උ͞ΕΔͱ͍͏͜ͱ͋Γɺ Ծ௨՟͕ࣾձʹΈࠐ·ΕΔաఔͱͯ͠ϓϥεͱͯ͠ଊ͑Δߟ͑ํ͋Δ
߈ܸ ԋࢉॲཧೳྗʢϋογϡϨʔτʣͷաҎ্Λ ίϯτʔϧͰ͖Δ߹ɺෆਖ਼ͳऔҾΛঝೝ͢Δ͜ͱͳͲ͕ՄೳʹͳΓ ৴པੑΛࣦ͏Մೳੑ͕͋Δ େखϚΠφʔ͕݁ୗ͢ΕෆՄೳͰͳ͍͕ɺԾ௨՟ͷՁ͕མ͢ΔͷͰ ࣮ߦ͢ΔϝϦοτ͕ͳ͘ɺݱ࣮తʹ࣮ߦ͞ΕΔ͜ͱͳ͍ͱݴΘΕ͍ͯΔ
खྉͷߴಅɺૹۚ࣌ؒͷԆ औҾྔ͕ଟ͘ͳΔͱϚΠχϯάͷॲཧ͕͍͔ͭͣૹ͕͔͔ۚ࣌ؒͬͨΓɺ खྉ͕ߴಅ͢Δ ͜͜࠷ۙCJU$PJOૹ͕ۚौ͢Δ͕ൃੜ͍ͯ͠Δ
IPSJHVDIJZVKJ!LJSBCBKQ ༷ʑͳ՝ΛͲͷΑ͏ʹ ղܾ͍ͯ͘͠ͷ͔ ʢ·ͨͰ͖ͳ͍ͷ͔ʣΛݟ͍ͯ͘ͷ Ծ௨՟ͷָ͠ΈͷҰͭͰ͢
IPSJHVDIJZVKJ!LJSBCBKQ ࢿͱ͓ͯ͢͢͠Ί͠·ͤΜ͕ɺ Ծ௨՟ʹະདྷΛײͨ͡Βগ͚ͩ͠ ࣋ͬͯΈ͍͔͕ͯͰ͠ΐ͏͔ ˞Ծ௨՟औҾʹ༷ʑͳϦεΫ͕͋Γ·͢ɻ
IPSJHVDIJZVKJ!LJSBCBKQ ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠