NFTを開発するためのブロックチェーン・スマートコントラクト技術

by Shu Kobuchi

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/'5Λ։ൃ͢ΔͨΊͷϒϩοΫνΣʔϯɾ εϚʔτίϯτϥΫτٕज़ ೥݄೔ ౔ !04$0OMJOF4QSJOH ೔ຊ҉߸௨՟Ϣʔβձɹখᔹप 4IV,PCVDIJ

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ࣗݾ঺հ খᔹपɹ4IV,PCVDIJɹ!TIV@LPC γεςϜ։ൃΛ͖ͯͨ͠தͰɺ   ೥࢓ࣄͰ#JUDPJO8FC8BMMFUϓϩτλΠϓͷ։ൃʹैࣄ Ծ૝௨՟औҾॴ޲͚΢ΥϨοτϕϯμʔͰ։ൃɾӡ༻ ʙԾ૝௨՟औҾॴͷΤϯδχΞ ೔ຊ҉߸௨՟Ϣʔβձ͸೥͔ΒࢀՃ͠ɺӡӦΛ຿ΊΔ झຯɿమಓɺञɺΧϥΦέ 2

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ίϛϡχςΟ঺հ ೔ຊ҉߸௨՟ϢʔβձɹIUUQTDSZQUPDVSSFODZDPOOQBTTDPN ʮϏοτίΠϯͱ͔ษڧձʯʢ݄̍ճɿฏ೔໷ʣ ʮ҉߸௨՟ಡॻձʯʢ݄̍ճɿฏ೔໷ʣ :PV5VCFͰΞʔΧΠϒࢹௌՄೳIUUQCJUMZZPVUVCFDDTUVEZ w νϟϯωϧొ࿥͓ئ͍͠·͢ʂ 3

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͜Ε·Ͱͷ04$ൃදͷΞʔΧΠϒ ॳ৺ऀͷͨΊͷϏοτίΠϯૹۚମݧʢ04$0OMJOF4QSJOHʣ IUUQTZPVUVCFNH3YT934 ϏοτίΠϯɾϒϩοΫνΣʔϯೖ໳ʢ04$0OMJOF'BMMʣ IUUQTZPVUVCF,5;DXZ-WX 4

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ΠʔαϦΞϜ͸Φʔϓϯιʔε ϏοτίΠϯ #JUDPJO ͸Φʔϓϯιʔε ୭Ͱ΋։ൃʹࢀՃՄೳʂ   IUUQTHJUIVCDPNCJUDPJOCJUDPJO ϏοτίΠϯΛ͸͡Ίɺ҉߸௨՟ɾϒϩοΫνΣʔϯͷଟ͘͸044 ٕज़తʹ΋໘ന͍ʂʂ ϥΠτίΠϯ -JUFDPJO ͸#JUDPJOͷιʔείʔυ͔ΒϑΥʔΫ   IUUQTHJUIVCDPNMJUFDPJOQSPKFDUMJUFDPJO ϞφίΠϯ .POBDPJO ͸-JUFDPJOͷιʔείʔυ͕ϕʔε   IUUQTHJUIVCDPNNPOBDPJOQSPKFDUNPOBDPJO ΠʔαϦΞϜ &UIFSFVN ΋Φʔϓϯιʔε   IUUQTHJUIVCDPNFUIFSFVNHPFUIFSFVN 5

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#JUDPJO

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ϏοτίΠϯͱ͸ தԝ؅ཧऀΛ࣋ͨͳ͍11ిࢠϚωʔγεςϜʢඇதԝूݖతͳ҉߸௨՟ʣ தԝ؅ཧऀΛ࣋ͭۚ༥γεςϜͱ͸ۜߦͳͲ ϏοτίΠϯ͕ੜ·ΕΔલ͔Β11ిࢠϚωʔͷݚڀ͸ߦΘΕ͍ͯͨ w ࣮༻ԽϨϕϧͰॳΊͯ੒ޭͨ͠ͷ͕ϏοτίΠϯ w ҎޙɺϏοτίΠϯͷٕज़Λجʹ༷ʑͳ҉߸௨՟͕ొ৔ w ϏοτίΠϯͷج൫ٕज़ʮϒϩοΫνΣʔϯʯΛ௨՟Ҏ֎΁ͷԠ༻΋ ೥຤4BUPTIJ/BLBNPUP φΧϞτατγ ͕࿦จΛΦʔϓϯιʔείϛϡχςΟͷϝʔϦϯάϦετʹ౤ߘ w IUUQTCJUDPJOPSHCJUDPJOQEG ೥ʹϏοτίΠϯ͕Քಇ࢝͠Ίͨ 7

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ϋογϡؔ਺ Մม௕ͷೖྗ஋ʹର͠ɺݻఆ௕ͷग़ྗ஋Λฦ͢ ཚ਺Ͱ͸ͳ͍ͷͰɺಉ͡ೖྗ஋͔Β͸ৗʹಉ͡ग़ྗ஋ΛಘΔ ग़ྗ஋͔Βೖྗ஋Λਪଌ͢Δͷ͸΄΅ෆՄೳ IUUQTXXXNPWBCMFUZQFDPVLTDSJQUTTIBIUNM   IUUQTHPPHM1PHF# 8 ೖྗ͸Մม௕ PQFOTPVSDF ग़ྗ͸ݻఆ௕ PQFOTPVSDJ CFBCCGCEBDFFD DCFBCBCCDDFCGDG CBEBEFBGCEC DBFDBEGDGFFB 4)" ϋογϡؔ਺ 4)" ϋογϡؔ਺ Ұจࣈ ม͑Δ શ͘ҟͳΔ ஋ʹ

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ެ։伴҉߸ ެ։伴͸ʮ伴ʯͱ͍͏໊લ͕ͩɺʮৣʯΛΠϝʔδ͢ΔͱΘ͔Γ΍͍͢ ΞϦε͸Ϙϒͷެ։伴Λ༻͍ͯɺฏจΛ҉߸Խ͢Δ Ͱ͖ͨ҉߸จ͸Ϙϒͷൿີ伴Ͱ͔͠෮߸ԽͰ͖ͳ͍ ҉߸Խ͢Δ伴ʢެ։伴ʣͱ෮߸Խ͢Δ伴ʢൿີ伴ʣ͕ผʑ ΞϦε͸Ϙϒͷൿີ伴͕ͳͯ͘΋Ϙϒʹ͔͠෮߸ԽͰ͖ͳ͍҉߸จΛ࡞੒Մ 9 φΧϞτατγͷ ਖ਼ମ͸ʓʓʓ DECGEGE FCDBECC EDCCFDD Ϙϒͷެ։伴 φΧϞτατγͷ ਖ਼ମ͸ʓʓʓ ҉߸จ ฏจ ฏจ Ϙϒͷൿີ伴 ҉߸Խ ෮߸Խ ΞϦε Ϙϒ

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ϏοτίΠϯͷެ։伴҉߸ʢུ֓ʣ ΞϦε͸Ϙϒʹ#5$ૹΓ͍ͨ ΞϦε͸Ωϟϩϧ͔Βड͚औͬͨ#5$͕͋Δͱ͢Δ ΞϦεͷެ։伴͕͔͔ͬͨ#5$͕͋Δ ΞϦεͷൿີ伴ͰϩοΫΛղআͯ͠࢖͑ΔΑ͏ʹͳΔ ΞϦε͕Ϙϒͷެ։伴Λ͔͚Δ͜ͱͰϘϒʹϏοτίΠϯΛૹΔ 10 #5$ Ϙϒͷެ։伴 ΞϦεͷൿີ伴 Ωϟϩϧ #5$ ΞϦεͷެ։伴 ϩοΫղআ Ωϟϩϧ͔Β ΞϦεʹૹۚ ΞϦε͔Β Ϙϒʹૹۚ

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ΞυϨεੜ੒ ൿີ伴͸ཚ਺Λ࢖ͬͯಘΔ Ϗοτͷ੔਺ͳͷͰɺճίΠϯΛ౤͛ͯੜ੒΋Մೳ ެ։伴͸&$%4" ପԁۂઢ҉߸ Λ༻͍ͯൿີ伴ͷεΧϥʔഒࢉʢෆՄٯʣ ΞυϨε͸ެ։伴ͷϋογϡʢෆՄٯʣ ެ։伴ِ଄໰୊Λ๷͙ͨΊɺϏοτίΠϯͰ͸ެ։伴ͱҰରҰͰରԠ͢ΔΞυϨεΛ࢖༻ʢதԝ؅ཧऀ͕͍ͳ͍ͨΊɺೝ ূہ͸࢖Θͳ͍ʣ ൿີ伴Λ஌ΒΕΔͱɺ#5$͕౪·ΕΔͷͰ؅ཧ͸ݫॏʹʂ 11 L ൿີ伴 1SJWBUF,FZ , ެ։伴 1VCMJD,FZ " ΞυϨε "EESFTT ପԁۂઢ্ͷ εΧϥʔഒࢉ Ұํ޲ ϋογϡؔ਺ Ұํ޲ ਪଌෆՄ ෆՄٯ ਪଌෆՄ ෆՄٯ

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ൿີ伴ɾެ։伴ɾΞυϨεͷ࣮ྫ ൿີ伴͕Θ͔Ε͹ɺੜ੒نଇ͔ΒҰҙʹܾ·ΔΞυϨεʹඥͮ͘ίΠϯΛૹۚͰ͖Δ ઈରʹଞਓʹݟΒΕͯ͸͍͚ͳ͍ 12 L ൿີ伴 1SJWBUF,FZ , ެ։伴 1VCMJD,FZ " ΞυϨε "EESFTT DEFCDBCEEFFDECGBED CECCFDCDFGEEECE EBDEEFBCGGFCGD DEFCDBCEEFFD ECGBEDCECCFD DYQP.#$::8$H'485EDNYJQO(6T1X

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τϥϯβΫγϣϯ5SBOTBDUJPO59 ΞϦε͕Ϙϒʹ#5$ΛૹΔ Ҏલड͚औֹ͍ͬͯͨΛ߹ࢉͯ͠ɺ૬खʹૹΓɺ͓௼Γ͸ࣗ෼΁ 59தʹهࡌͷͳֹ͍ ͜͜Ͱ͸#5$ ͸ޙʹϚΠφʔ΁ 13 ΞϦε Ϙϒ 5SBOTBDUJPO 59 */165 065165 ΞϦε Ωϟϩϧ ΞϦεˠϘϒ #5$ ΩϟϩϧˠΞϦε #5$ ΞϦεˠΞϦε ͓௼Γ #5$ #5$ σϏοτˠΞϦε #5$ #5$ σϏοτ ܭ#5$ ܭ#5$ ϚΠφʔ ωοτϫʔΫख਺ྉ #5$ ˞59ʹهࡌ͸ͳ͍ ൿີ伴Λࠩ͠ࠐΜͰ ϩοΫղআɿిࢠॺ໊ ΞϦεͷ ൿີ伴 ΞϦεͷ ൿີ伴 ΞϦεͷ ެ։伴 Ϙϒͷ ެ։伴 ΞϦεͷ ެ։伴 ΞϦεͷ ެ։伴

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ΞυϨεͷ؅ཧͱಗ໊ੑ ϏοτίΠϯͷ৔߹ ΞυϨε͸ҰਓͰ͍ͭ͘΋࣋ͯΔ w ͓௼ΓΞυϨεΛૹ৴ݩΞυϨεͱ͸ผʹͯ͠ɺಗ໊తʹར༻ͨ͠ํ͕͍͍ w ୭͕͍͘Β͍࣋ͬͯΔ͔Λ஌ΒΕͳ͍ͨΊ ΠʔαϦΞϜͷ৔߹ ΞυϨε͸ҰਓͰ͍ͭ͘΋࣋ͯΔ͕ɺଟ਺ͷΞυϨεΛ࢖͍͜ͳ͢ͷ͸ΞΧ΢ϯτܕͷಛੑ্ෆศ w ಗ໊ੑͱ͍͏؍఺Ͱ͸མͪΔ ΞυϨεٴͼͦͷதʹ͋ΔԾ૝௨՟͕୭ͷ࣋ͪ෺͔͸ϒϩοΫνΣʔϯωοτϫʔΫͰ͸Θ͔Βͳ͍ ΞυϨεͷੜ੒ݩͱͳͬͨൿີ伴Λૢ࡞Ͱ͖Δਓ͕࣋ͪओ ൿີ伴Λ౪·Εͯ΋ϏοτίΠϯωοτϫʔΫͰ͸ؔ༩͠ͳ͍ 14

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11ωοτϫʔΫͰͷసૹ ࡞੒ͨ͠τϥϯβΫγϣϯΛϏοτίΠϯ11ωοτϫʔΫʹϒϩʔυΩϟετ ൃใ ͢Δ ϊʔυ͸59ͷܗࣜΛνΣοΫ͠ɺϏοτίΠϯͷܗࣜͱͯ͠ਖ਼͚͠Ε͹ɺྡͷϊʔυʹసૹ͍ͯ͘͠ શͯͷϊʔυ͕ಉ͡59Λ࣋ͭ   ʢશੈքͷϊʔυʹߦ͖౉Δʣ 15 ΞϦε Ϙϒ 59 ൃใ 59 59 59 సૹ సૹ 59 59 59 సૹ సૹ సૹ సૹ స ૹ

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τϥϯβΫγϣϯνΣʔϯͱ6590ߏ଄ τϥϯβΫγϣϯ 59 ͸લͷ59ͷ৘ใΛ͍࣋ͬͯΔʢϋογϡϙΠϯλʣ ݩΛḷΕ͹ɺඞͣ$PJOCBTF59ʹͨͲΓண͘ ϚΠφʔ͸ࣗ෼ͷΞυϨεʹରͯ͠ϚΠχϯάใुΛૹΔ59ΛϒϩοΫʹؚ·ͤΔ */165෦͸ۭ 65906OTQFOU5SBOTBDUJPO0VUQVUϏοτίΠϯ͸ʮ6590ߏ଄ʯ 16 TX Coinbase TX ۭ TX TX TX TX TX TX 16 ࢀর ࢀর ࣍ͷ59ͷ*/165ʹ࢖༻͞Ε͍ͯͳ͍ ະ࢖༻6590ͷ͔͖ूΊ͕࢒ߴ

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ϏοτίΠϯͷ΢ΥϨοτ ΢ΥϨοτʹ͓͕ۚೖ͍ͬͯΔͱ͍͏ΑΓ͸ɺൿີ伴͕ೖ͍ͬͯΔ ൿີ伴͸σδλϧσʔλ จࣈྻ ͳͷͰ౪ΈݟΒΕΔͱଞਓ΋࢖͑Δ ෺ཧతͳ伴΋߹伴͕࡞ΕΔʢෳ੡Ͱ͖ΔʣΑ͏ʹ ϊʔυͷ෼ࢄ୆ா͸શऔҾΛ͓࣋ͬͯΓɺΈΜͳಉ͡σʔλ ൿີ伴ͰੈքதͷͲͷϏοτίΠϯϊʔυ͔ΒͰ΋ࣗ෼ѼͰ   ະ࢖༻ͳ 6OTQFOU 5SBOTBDUJPO0VUQVU 6590   Λૢ࡞͢Δ͜ͱ͕Ͱ͖Δ 17 TX TX ࣗ෼ͷ 6590 ଞਓͷ 6590 ࣗ෼ͷ 4QFOU ࣗ෼ͷ 6590

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ೋॏࢧ෷͍໰୊ ΞϦε͸Ωϟϩϧ͔Β΋Βͬͨ#5$ΛϘϒʹ΋ૹཧɺΤϨϯʹ΋ૹͬͨͱ͢Δʢೋॏࢧ෷͍Λͨ͠ʣ ͲͪΒͷτϥϯβΫγϣϯΛਖ਼౰ͱݟͳ͔͢ ؅ཧऀ͕͍Ε͹؅ཧऀͷϊʔυʹಧ͍ͨઌணॱͰܾΊΕ͹ྑ͍ ͔͠͠ɺ؅ཧऀͷ͍ͳ͍෼ࢄωοτϫʔΫͰ͜ͷରࡦΛ͠ͳ͚Ε͹ͳΒͳ 11ωοτϫʔΫ্Ͱઌணॱͷ൑ఆ͸ෆՄೳ 18 ΞϦε Ϙϒ 59 5PϘϒ 59 5PΤϨϯ Ωϟϩϧ ΤϨϯ #5$ #5$ #5$ ೋॏࢧ෷͍ Ϙϒ ΤϨϯ

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ೋॏࢧ෷͍ΛແޮԽ͢Δʹ͸ʁ ೋॏࢧ෷͍ΛແޮԽ͢ΔͨΊʹɺ6590͕࢖༻ࡁΈͰ͋Δ͔ͷ൑ఆ͕ඞཁ ࢖༻ࡁΈͰ͋Δ͜ͱ͸ɺܝࣔ൘ʹ·ͱΊͯ஌ΒͤΔ ϒϩοΫ͸ެ༻ܝࣔ൘ 19 ࢖༻ࡁΈ6590Ұཡ ΞϦεˠϘϒ#5$ ΤϨϯˠΩϟϩϧ#5$ ΩϟϩϧˠσϏοτ#5$ ΩϟϩϧˠΞϦε#5$ ϘϒˠΤϨϯ#5$

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୭͕ϒϩοΫʢܝࣔ൘ʣΛ࡞੒͢Δͷ͔ʁ ۃΊͯ௿͍֬཰ͷλʔήοτΛݟ͚ͭͨਓʹϒϩοΫʢܝࣔ൘ʣ࡞੒ͷݖར ྫ͑ΔͳΒɺ࢛ͭ༿ͷΫϩʔόʔΛ୳͢େձ ௿͍֬཰ͷλʔήοτ͕ݟ͔ͭͬͨ ͦΕ͚ͩେมͳ࡞ۀΛͨ͠ͱ͍͏͜ͱ ӡΑ͙͘͢ʹݟ͔ͭΔ͜ͱ΋͋Δ͕ɺ੒ޭΛଓ͚Δʹ͸࿑ྗΛׂ͖ଓ͚Δ͔͠ͳ͍ ϏοτίΠϯͷ৔߹͸ɺޮ཰తͳΞϧΰϦζϜ͕ଘࡏ͠ͳ͍ͱ͞ΕΔ୯७ͳܭࢉΛͻͨ͢Β΍Γଓ͚Δ ΍Δͷ͸ϚΠχϯάϚγϯͰɺిؾ୅͕ͱͯ΋͔͔Δ େมͳ࡞ۀΛͨ͠ਓ͸ෆਖ਼ͷͨΊΑΓ΋ϒϩοΫใुͱ͍͏ΠϯηϯςΟϒͷͨΊʹਖ਼͍͠ߦಈΛ͢Δͱ͍͏લఏ 1SPPGPG8PSLʢ࡞ۀূ໌ʣͱ͍͏ 20

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ϚʔΫϧϧʔτ ϒϩοΫͷߏ଄ ϒϩοΫʹؚΊΔτϥϯβΫγϣϯΛ·ͱΊͨϚʔΫϧϧʔτΛܭࢉ 59͕ͲͷϒϩοΫʹೖ͍ͬͯΔ͔͕Θ͔Δ ϒϩοΫϔομͱτϥϯβΫγϣϯ͕ϒϩοΫʹؚ·ΕΔ ʮφϯεʯͱ͍͏ԿͰ΋ྑ͍ύϥϝʔλΛೖΕͯϒϩοΫͷϋογϡΛܭࢉ ͦͷ಄/ܻ͕શͯʹͳΔ·Ͱʢਐ਺ͳͷͰɺ֬཰͸ͷ/৐ʣ ͘͢͝௿͍֬཰ʢྫ͑ΔͳΒܻ͋ΔೆژৣΛຖճ਺ࣈม͑ͯղৣͰ͖Δ͔ࢼ͢ʣ 21 લͷϒϩοΫͷ ϋογϡ લͷϒϩοΫͷ ϔομ λΠϜελϯϓ φϯε ϒϩοΫͷϋογϡ GFCGEFGEGEECCDEF CFC ͻͨ͢Βม͑ͯ ϒϩοΫϋογϡΛܭࢉ 59 59 59 59 59 59

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ϒϩοΫνΣʔϯ ೋॏࢧ෷͍ΛແޮԽ͢Δखஈ ೋॏࢧ෷͍͸Ͱ͖Δ͕ɺϒϩοΫʹࡌΒͳ͚Ε͹ແޮ ϒϩοΫνΣʔϯ͸ࣄޙঝೝͷζϧ͍γεςϜ ͔ͩΒɺམͪͳ͍ τϥϯβΫγϣϯΛେྔʹྲྀͯ͠ωοτϫʔΫͷෛՙΛ্͛ͯ΋ɺ஗Ԇ͕ى͜Δ͚ͩͰམͪͳ͍ தԝ؅ཧ͞ΕͨγεςϜͩͱɺ%#Ͱॱ൪ʹॲཧ͢ΔͨΊɺॲཧ͕٧·ΔͱམͪΔ 22

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ϒϩοΫνΣʔϯ ϒϩοΫ͸લͷϒϩοΫΛϋογϡϙΠϯλͰࢀরͯ͠ (FOFTJT#MPDL ͔Β࠷৽ͷϒϩοΫ·Ͱܨ͕͍ͬͯΔ ్தͷϒϩοΫʹऔΓࠐ·Ε͍ͯΔτϥϯβΫγϣϯͷத਎Λมߋ͢Δʹ͸ɺϒϩοΫͷ࡞Γ௚͠ͱޙଓͷϒϩοΫΛ࡞ Γ௚͞ͳ͚Ε͹ͳΒͳ͍ w ϏοτͰ΋ม͑Δͱɺϋογϡ஋͕શ͘ҟͳΔͷͱɺϒϩοΫΛ࡞Γ௚͢ϚΠχϯά΋ඞཁͰɺվ͟Μ͸ࠔ೉ 23 ࢀর ࢀর ࢀর ࢀর ࢀর ࢀর 59 59 59 59 59 59 59 ᶃվ͟Μ͍ͨ͠ ᶄϒϩοΫ࡞Γ௚͠ ͜Ε͚ͩͰ΋େม ᶅޙଓͷϒϩοΫ࡞Γ௚͠ ͘͢͝େม ௕͍ϒϩοΫΛ ਖ਼౰ͱΈͳ͢ ᶆݱࡏͷϒϩοΫνΣʔϯ ΑΓ΋௕͘͢Δ

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ϒϩοΫνΣʔϯ ϒϩοΫͷϋογϡ಄/ܻ͕Ͱ͋Δ͔ʢ೉қ౓ʣ͸ϒϩοΫ͔͔ͬͨ࣌ؒΛ ෼ ೔िؒ ͱൺֱܾͯ͠ΊΔ ̍ϒϩοΫ࡞Δͷʹฏۉ෼ ೉қ౓Λ্͛Δʹ͸಄ͷͷܻ਺Λ૿΍͢ɺ೉қ౓ΛԼ͛ΔͳΒݮΒ͢ ੒ޭ֬཰͸?/ʢ/ɿܻ਺ɺϋογϡ͸ਐ਺ʣݱࡏܻ ϒϩοΫใु͸ (FOFTJT#MPDL ͕#5$ɺ Ͱ#5$ɺ Ͱ#5$ͱ͍͏Α͏ʹ ϒϩοΫ ͝ͱʹใु൒ݮ ໿̐೥ʹ̍ճՆقޒྠͷ೥ͷՆࠒʹ൒ݮ͢Δ ϏοτίΠϯΛ৽نൃߦ͍ͯ͠Δ ೥ʹ৽نൃߦ͕ऴΘΓɺ૯ֹສ#5$ͱͳΔ ݶΓ͋Δۚ ΰʔϧυ ͷ࠾۷ ϚΠχϯά ʹͳͧΒ͑ͯϒϩοΫੜ੒࡞ۀͷΛϚΠχϯάͱݺͿ 24

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ϒϩοΫͷঝೝ਺ ঝೝ਺͕ଟ͚Ε͹ଟ͍΄Ͳ෴Γʹ͍͘ʢ֬཰తϑΝΠφϦςΟʣ 25 TX Memory Pool(mempool) TX ࠷৽ϒϩοΫ ະঝೝʢ̌ঝೝɿ0 Confirmation) TX Memory Pool(mempool) TX ࠷৽ϒϩοΫ 1ঝೝɿ1 Confirmation ࣗ෼ͷૹۚTX TX ࣗ෼ͷૹۚTX TX Memory Pool(mempool) TX ࠷৽ϒϩοΫ 6ঝೝɿ6 Confirmationʢ঎औҾͰΑ͘࢖ΘΕΔঝೝ਺ʣ TX ࣗ෼ͷૹۚTX ະঝೝTX(τϥϯβΫγϣϯ) ؚ͕·ΕΔ ϚΠφʔใु͸ঝೝ͞ΕΔ·ͰϩοΫ͞Ε͍ͯͯɺͦΕ·Ͱ࢖༻Ͱ͖ͳ͍

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ใुͷҙຯ ΠϯηϯςΟϒ͕͋Δ͜ͱͰɺϚΠχϯάͱ͍͏ӡ༻΁ͷࢀՃΛଅ͢ ϚΠφʔ͕૿͑ɺϋογϡύϫʔ͕େ͖͘ͳΔͱɺϏοτίΠϯωοτϫʔΫͷηΩϡϦςΟ͕૿͢ w ੈքதͷεʔύʔίϯϐϡʔλ͕ଋʹͳͬͯ΋ϏοτίΠϯωοτϒϩοΫνΣʔϯΛվ͟ΜͰ͖ͳ͍ ϒϩοΫʹؚ·ΕΔτϥϯβΫγϣϯͷख਺ྉ΋ϚΠφʔ͕΋Β͑Δ ϒϩοΫใु৽نൃߦ ݱࡏ#5$ Є ϒϩοΫதͷ59ख਺ྉ 26 ϒϩοΫ 59 59 59 59 59 59 5SBOTBDUJPO 59 */165 065165 ΞϦεˠϘϒ #5$ ΩϟϩϧˠΞϦε #5$ ΞϦεˠΞϦε ͓௼Γ #5$ σϏοτˠΞϦε #5$ ܭ#5$ ܭ#5$ ϚΠφʔ ωοτϫʔΫख਺ྉ #5$ ˞59ʹهࡌ͸ͳ͍ $PJOCBTF59 ใुΛࣗ෼΁

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ϚΠχϯάͷϏδωεԽ ϚΠχϯάʹ͸େن໛ͳࢿຊ͕౤Լ͞ΕɺҰେϏδωεʹʂ ੲ͸ݸਓͰϚΠχϯάͰ͖͕ͨɺ͍·Ͱ͸ݸਓͰ͸ଠ౛ଧͪͰ͖ͳ͍Ϩϕϧʹͳ͍ͬͯΔ ϚΠχϯάϚγϯΛฒ΂ͨࢪઃ͸ϚΠχϯάϑΝʔϜͱΘΕɺ޻৔ͷΑ͏ͳ ϚΠχϯάใु֫ಘͷͨΊʹɺܹ͍͠ϚΠχϯάڝ૪ 27 ੈք࠷େखͷϚΠχϯάϑΝʔϜ#JUNBJO

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ωοτϫʔΫख਺ྉͷҙຯ ϚΠφʔ͕ঝೝͰ͖Δσʔλྔʹ͸ݶΓ͕͋Δ ωοτϫʔΫख਺ྉΛ՝͢͜ͱʹΑͬͯɺωοτϫʔΫ্ͷσʔλྔΛ཈੍͢Δ͜ͱ͕Ͱ͖Δ ख਺ྉ͸σʔλαΠζʹൺྫ͢Δ τϥϯβΫγϣϯͷ*/165਺ɺ065165਺͕ଟ͚Ε͹σʔλαΠζ͸େ͖͘ͳΔ ख਺ྉ͸ωοτϫʔΫͷࠞࡶ౓߹͍ʹӨڹ͞ΕΔ ର๏ఆ௨՟ͷՁ֨ͱ͸௚઀ؔ܎ͳ͍͕ɺ͜ͷՁ্͕͕֨ΔͱऔҾ਺͕૿͑ΔͨΊख਺ྉ͸্ঢ͠ɺՁ͕֨҆ఆ͍ͯ͠Δ࣌ ͸ख਺ྉ͕͍҆ ࢢ৔ͷݪཧʹΑͬͯ໨͕҆Θ͔Δ ͲͷτϥϯβΫγϣϯΛϒϩοΫʹऔΓࠐΉ͔͸ϚΠφʔ͕ࣗ༝ʹܾΊΒΕΔ ϚΠχϯά΋ϏδωεͳͷͰɺख਺ྉͷߴ͍59͕༏ઌͯ͠औΓࠐ·ΕΔ ૹۚऀ͕෷͏ ిࢠܾࡁͷΑ͏ʹళฮଆ डऔଆෛ୲ ͕Ͱ͖ͳ͍ 28

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ϊʔυɾ΢ΥϨοτͷछྨ ϑϧϊʔυ͸11ωοτϫʔΫʹྲྀΕΔτϥϯβΫγϣϯͱϒϩοΫΛݕূ͠ɺਖ਼͍͠ܗࣜͷ΋ͷ͸ࣗϊʔυऔΓࠐΉ աڈ͔ΒશͯͷτϥϯβΫγϣϯʢऔҾཤྺʣͱϒϩοΫΛ࣋ͭ શͯͷσʔλΛ࣋ͭʹ͸ॏ͗͢ΔͷͰɺϒϩοΫϔομͱࣗ෼ͷ΢ΥϨοτʹؔ܎͢ΔऔҾͷΈΛ࣋ͭܰྔ΢ΥϨοτ ʮ417ϊʔυʗ΢ΥϨοτʯ͕͋Δ औҾͷݕূ͸Ͱ͖ͳ͍ ࣗ෼ͷϊʔυΛ࣋ͨͣʹΞυϨεੜ੒΍ૹۚͷͰ͖Δ8FC΢ΥϨοτ΋͋Δ͕ɺηΩϡϦςΟతʹ஫ҙ͕ඞཁ ෺ཧతͳૢ࡞ΛߦΘͳ͍ͱૹ͕ۚͰ͖ͳ͍ηΩϡϦςΟ͕ߴ͍ϋʔυ΢ΣΞ΢ΥϨοτ΋͋Δ ϞόΠϧ΢ΥϨοτ͸ɺϞόΠϧΞϓϦʹൿີ伴͕ೖ͍ͬͯͯૹ͕ۚͰ͖Δ େۚ͸ஔ͘΂͖Ͱ͸ͳ͍ 29

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ϒϩοΫνΣʔϯΤΫεϓϩʔϥ ࣗ෼ͰϊʔυΛ࣋ͨͳͯ͘΋શͯͷऔҾͱϒϩοΫΛՄࢹԽͰ͖ΔϒϩοΫνΣʔϯΤΫεϓϩʔϥ͕͋Δ IUUQTXXXCMPDLDIBJODPNKBFYQMPSFS ༷ʑͳ։ൃݩ͔ΒϒϩοΫνΣʔϯΤΫεϓϩʔϥ͕ఏڙ͞Ε͍ͯΔ 30

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։ൃ༻ωοτϫʔΫ ։ൃʹຊ෺ͷϏοτίΠϯΛ࢖͏ͯɺࣗ෼͔Βࣗ෼ʹૹۚͨ͠ͱͯ͠΋ωοτϫʔΫख਺ྉ͕͔͔Δ ։ൃ༻ʹؾܰʹૹ͕ۚͰ͖ΔΑ͏ςετωοτ͕ଘࡏ͢Δ ςετωοτίΠϯ͸ແՁ஋ 31 ϝΠϯωοτ ʢຊ෺ʣ ςετωοτ ಠཱ

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'BVDFU ։ൃ༻ʹςετωοτϏοτίΠϯ͕΋Β͑Δ'BVDFU ʮऄޱʯͱ͍͏ҙຯ ͱ͍͏όϥϚΩॴαʔϏε͕͋Δ IUUQTDPJOGBVDFUFVFOCUDUFTUOFU ଞʹ΋༷ʑͳ'BVDFU 32

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&UIFSFVNʢΠʔαϦΞϜʣ

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&UIFSFVNͷ͸͡·Γ ϏοτίΠϯͷج൫ٕज़ʢޙʹʮϒϩοΫνΣʔϯʯͱݺ͹ΕΔΑ͏ʹͳΔʣΛ༻͍ͯ৽͍͠νΣʔϯΛఏҊ IUUQTFUIFSFVNPSHFOXIJUFQBQFS೥ʹൃද͞ΕͨϗϫΠτϖʔύʔ 34

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11ωοτϫʔΫͰͷసૹ ࡞੒ͨ͠τϥϯβΫγϣϯΛΠʔαϦΞϜ11ωοτϫʔΫʹϒϩʔυΩϟετ ఻೻ ͢Δ ϊʔυ͸59ͷܗࣜΛνΣοΫ͠ɺϏοτίΠϯͷܗࣜͱͯ͠ਖ਼͚͠Ε͹ɺྡͷϊʔυʹసૹ͍ͯ͘͠ શͯͷϊʔυ͕ಉ͡59Λ࣋ͭ   ʢશੈքͷϊʔυʹߦ͖౉Δʣ 35 ΞϦε Ϙϒ 59 ఻೻ 59 59 59 సૹ సૹ 59 59 59 సૹ సૹ సૹ సૹ స ૹ

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෼ࢄΞϓϦέʔγϣϯ %"QQT શϖʔδͷ59ΛΞϓϦέʔγϣϯʹஔ͖׵͑ͯߟ͑Δ ΠʔαϦΞϜϒϩοΫνΣʔϯ্ͰՔಇ͢ΔεϚʔτίϯτϥΫτ͕σϓϩΠ͞ΕΔͱɺͦͷσʔλ΋શੈքͷ෼ࢄ୆ாʹ ه࿥͞ΕΔ ۭத໿ଋݻఆ૷ஔCZ੪౻ݡ࣐ૣҴాେֶڭत 36 ΞϦε σϓϩΠ సૹ సૹ సૹ సૹ సૹ స ૹ %"QQ %"QQ %"QQ %"QQ %"QQ %"QQ %"QQ సૹ Ϙϒ ࢖༻Մೳ Ωϟϩϧ σϏοτ ࢖༻Մೳ ࢖༻Մೳ ࢖༻Մೳ

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%BQQͷཁૉ %BQQͷཁૉʢʮϚελϦϯάɾΠʔαϦΞϜʯ1ΑΓʣ όοΫΤϯυʢεϚʔτίϯτϥΫτʣ ϑϩϯτΤϯυʢ8FC6*ʣ σʔλετϨʔδ ϝοηʔδ௨৴ ໊લղܾ 37 https://github.com/ethereumbook/ethereumbook/blob/develop/12dapps.asciidoc

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%BQQͷσʔλετϨʔδ εϚʔτίϯτϥΫτ͸େྔͷσʔλͷอ؅΍ॲཧʹ͸ద͍ͯ͠ͳ͍ ΦϑνΣʔϯͷσʔλετϨʔδαʔϏεΛར༻ *1'4΍4XBSNͳͲ11ετϨʔδΛར༻͢Δͱඇதԝूݖతʹ؅ཧՄೳ ը૾ɺϏσΦɺΞϓϦέʔγϣϯͷϑϩϯτΤϯυ8FCΠϯλʔϑΣʔεʢ)5.-ɺ$44ɺ+BWB4DSJQUͳͲʣେن໛ͳ੩ తΞηοτͷ֨ೲ΍഑෍ʹ࠷ద 38

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*1'4 *OUFS1MBOFUBSZ'JMF4ZTUFN *1'4ࣗମ͸ϒϩοΫνΣʔϯͰ͸ͳ͍ 11ωοτϫʔΫ಺ͷϐΞؒͰอଘ͞Ε͍ͯΔΦϒδΣΫτΛ഑৴͢ΔඇதԝूݖܕͷίϯςϯτΞυϨοαϒϧετϨʔ δγεςϜ ίϯςϯπʢϑΝΠϧʣͷ֤෦෼ͷϋογϡ͕ͦͷϑΝΠϧΛࣝผ͢ΔͨΊʹ࢖༻͞ΕΔ ೚ҙͷ*1'4ϊʔυ͔Β೚ҙͷϑΝΠϧΛऔΓग़͠Մೳ 8FCΞϓϦέʔγϣϯ഑৴༻ϓϩτίϧͱͯ͠)551Λஔ͖׵͑Δߏ૝ w αʔόͷ11ԽΛଅਐ 39 ϋογϡ ίϯςϯπΞυϨοαϒϧͷΠϝʔδ *%

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&3$τʔΫϯʹ*1'4ͰΞΠίϯ෇༩ ը૾ϑΝΠϧΛ*1'4ʹ֨ೲͨ͠ޙɺ*1'4ͷ*%ΛτʔΫϯDPOUSBDUͷJDPOʹࢦఆͯ͠σϓϩΠ IUUQTJQGTJPJQGT2N4C6/NH7:%N[Q)JL4J.R[U3BN(J&HOK8[Z8EFX2P 40 $ ipfs add toka.png added QmS9bUNmgVYD1mzpHikSiMqztRa7mGiEgnjW3zyWdew1Qo toka.png 50.82 KiB / 50.82 KiB [=========================================================================================== ===============================================================================] 100.00%

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4XBSN *1'4ʹྨࣅͨ͠ίϯςϯτΞυϨοαϒϧ11ετϨʔδγεςϜ &UIFSFVN'PVOEBUJPOʹΑͬͯHFUIπʔϧͷҰ෦ͱͯ͠࡞੒ *1'4ͱಉ༷ʹϑΝΠϧΛ֨ೲ ϑϩϯτΤϯυͷιʔείʔυ΋4XBSNʹ֨ೲͯ͠தԝαʔόͰ͸ͳ͘ɺ11γεςϜ͔Β8FCαΠτʹΞΫηεͰ͖Δ Α͏ʹ 41

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4XBSN &UIFSTDBOͷ$POUSBDU4PVSDF$PEF΋4XBSNʹอ؅͞Ε͍ͯΔ $POUSBDUιʔείʔυͷόΠφϧͱϒϩοΫνΣʔϯʹσϓϩΠ͞ΕͨόΠφϦͷҰகݕূ 42 $POUSBDU $PEF $POUSBDU όΠφϦ ίϯ ύΠϧ

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%BQQ εϚʔτίϯτϥΫτ αʔόʔαΠυ ϑϩϯτΤϯυ 4XBSNʹ֨ೲ ඇதԝूݖܕσʔλετϨʔδɿ*1'4ɺ4XBSN ඇதԝूݖܕϝοηʔδ௨৴ϓϩτίϧɿ8IJTQFS ϒϩοΫνΣʔϯͰߦ͏ඞཁͷͳ͍௨৴Λ୲౰ ඇதԝूݖܕωʔϜαʔϏε ໊લղܾ ɿ&/4 &UIFSFVN/BNF4FSWJDF શͯΛ11ඇதԝूݖͰಈ͔͢ɿ8FC 43

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/'5 /PO'VOHJCMF5PLFOʢඇ୅ସੑτʔΫϯʣ #5$ &5) &3$τʔΫϯͳͲ͸'VOHJCMF5PLFO /'5͸ٕज़తʹ͍͢͝ͱ͍͏Θ͚Ͱ͸ͳ͍ʢϏδωεͱͯ͠Ͳ͏׆͔͔͢ʣ '5͸ൃߦྔ͕೚ҙʢຕҎ্ʣͰɺ෼ׂՄೳʢখ਺఺ҎԼͷิॿ୯Ґ͕͋ΔʣʹͰ͖Δ /'5͸ൃߦྔ͕Ͱɺ෼ׂෆՄೳ /'5͕ෳ਺ൃߦ͞Ε͍ͯͨΓ͢Δ͕ τʔΫϯʹ*%Λৼ͍ͬͯΔύλʔϯ ͦΕͧΕͷݸମ͸/'5ͱΈͳ͢ /'5ʹ͢Δཧ༝͸ॴ༗ݖҠస௥੻ͷಁ໌Խ 44

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δʔϯΞΠυϧ &3$ʹҨ఻ࢠ৘ใΛه࿥͠ɺ།ҰແೋͷΞΠυϧΛੜ੒Ͱ͖Δ%BQQήʔϜ "*Ͱإͷը૾Λิਖ਼ ݱࡏ͸αʔϏεऴྃ 45 https://prtimes.jp/main/html/rd/p/000000001.000051149.html

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ϓϥΠϕʔτʗίϯιʔγΞϜɾϒϩοΫνΣʔϯ ύϒϦοΫܕͰ͸ͳ͘ɺࣾͷΈͰར༻͢ΔϓϥΠϕʔτνΣʔϯɺෳ਺ࣾͰར༻͢ΔίϯιʔγΞϜνΣʔϯ͕͋Δ ϓϥΠϕʔτʗίϯιʔγΞϜܕʹڞ௨͢Δͷ͸தԝ؅ཧऀ͕͍Δ͜ͱ &UIFSFVNΛίϯιʔγΞϜܕʹͨ͠2VPSVN΍)ZQFSMFEHFS#FTVͳͲ&OUFSQSJTF&UIFSFVN͕1P$Ͱ࢖ΘΕΔ͜ͱ͕ଟ ͍ 46

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ϝλόʔε Ծ૝ݱ࣮ۭؒͰ͋Δϝλόʔεʹͯɺ/'5ͷར༻͕ଅਐ͞Ε͍ͯΔ ϝλόʔε಺ͷ౔஍Λ/'5Խͯ͠ചങ ϝλόʔε಺Ͱ/'5Ξʔτͷചങ શϖʔδͰϓϥΠϕʔτʗίϯιʔγΞϜϒϩοΫνΣʔϯͷ࿩Λ͕ͨ͠ɺϝλόʔε΋ಉ༷ʹΦʔϓϯϝλόʔεɺΫϩʔ ζυϝλόʔε͕͋Δ 47

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&3$ΛςετωοτͰൃߦ IUUQTRJJUBDPNTIVLPCJUFNTEFECEC 48

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&3$Λൃߦ IUUQTXJ[BSEPQFO[FQQFMJODPNFSDศརαΠτͰίʔυΛੜ੒ɺίϐϖ IUUQTSFNJYFUIFSFVNPSH3FNJYͰσϓϩΠ &3$͸σϓϩΠ͚ͨͩ͠Ͱ͸ൃߦ͞Εͳ͍ σϓϩΠ࣌ʹ͸ரܕ͕Ͱ͖Δ͚ͩ TBGFNJOUͰൃߦ 49

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0QFO4FB5FTUOFUTͰ༡ΜͰΈΔ IUUQTUFTUOFUTPQFOTFBJPBDDPVOU 3JOLFCZͰ઀ଓ IUUQTGBVDFUSJOLFCZJP 'BVDFU ऄޱ͹Βࢃ͖ॴ Ͱ5FTUOFUίΠϯΛೖख 50

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ϒϩοΫνΣʔϯͷಛੑΛར༻ͯ͠/'5Λར༻͢Δ ʢύϒϩοΫʣϒϩοΫνΣʔϯͷಛ௃ ߴϓϥΠόγʔɺϘʔμʔϨε Ծ໊ੑʢಗ໊·Ͱ͸͍͔ͳ͍ʣΛར༻ͨ͠औҾ ϝλόʔεͷΑ͏ͳԾ૝ۭؒͱ૬ੑ͕͍͍ w ਓछɺੑผɺ೥ྸΛެ։ͤͣʹੈքͷਓʑͱަྲྀ͕Ͱ͖ɺϏδωε͕Ͱ͖Δ w ຋༁ٕज़ͷ޲্Ͱݴޠͷน΋ͳ͘ͳΔ w ࣗ༝ͳۭؒͷ౸དྷ w 5PS /'5͕৐͍ͬͯΔϒϩοΫνΣʔϯ͕͍ͭ·Ͱଓ͔͘Λߟ͑Δ ͲͷνΣʔϯ͕ੜ͖࢒Γͦ͏Ͱ͔͢ʁ ҉߸ࢿ࢈ʢԾ૝௨՟ʣͷಛੑΛཧղ͢΂͖ 51

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