NFT技術概論

/'5ٕज़֓࿦ ೥݄೔!04$ژ౎0OMJOF ೔ຊ҉߸௨՟Ϣʔβձɹখᔹप 4IV,PCVDIJ

খᔹपɹ4IV,PCVDIJɹ!TIV@LPCTIVLPCVDIJ γεςϜ։ൃΛ͖ͯͨ͠தͰɺ   ೥࢓ࣄͰ#JUDPJO8FC8BMMFUϓϩτλΠϓͷ։ൃʹैࣄ ʙԾ૝௨՟औҾॴ޲͚΢ΥϨοτͷ։ൃɾӡ༻ ʙ҉߸ࢿ࢈ަ׵ॴͷΤϯδχΞ ೔ຊ҉߸௨՟Ϣʔβձ͸೥͔ΒࢀՃ͠ɺӡӦΛ຿ΊΔ झຯɿα΢φɺమಓɺञɺΧϥΦέ ࣗݾ঺հ 2

ίϛϡχςΟ঺հ ೔ຊ҉߸௨՟ϢʔβձɹIUUQTDSZQUPDVSSFODZDPOOQBTTDPN ʮϏοτίΠϯͱ͔ษڧձʯ ʮ҉߸௨՟ಡॻձʯ w গͳ͘ͱ΋ͲͪΒ͔Λ݄ҰճͰ։࠵ :PV5VCFͰΞʔΧΠϒࢹௌՄೳIUUQCJUMZZPVUVCFDDTUVEZ w νϟϯωϧొ࿥͓ئ͍͠·͢ʂ 3

ΞδΣϯμ ϒϩοΫνΣʔϯ ΠʔαϦΞϜ εϚʔτίϯτϥΫτ %BQQTʢ&3$Λྫʹʣ ίϯςϯπͷϗεςΟϯά *1'4 &3$ 4

ϒϩοΫνΣʔϯʙೋॏࢧ෷໰୊ʙ ϏοτίΠϯ͕ղܾͨ͠ೋॏࢧ෷໰୊Λղઆ

11ωοτϫʔΫͰͷసૹ ࡞੒ͨ͠τϥϯβΫγϣϯΛϏοτίΠϯ11ωοτϫʔΫʹϒϩʔυΩϟετ ൃใ ͢Δ ϊʔυ͸59ͷܗࣜΛνΣοΫ͠ɺϏοτίΠϯͷܗࣜͱͯ͠ਖ਼͚͠Ε͹ɺྡͷϊʔυʹసૹ͍ͯ͘͠ શͯͷϊʔυ͕ಉ͡59Λ࣋ͭ   ʢશੈքͷϊʔυʹߦ͖౉Δʣ 6 ΞϦε
Ϙϒ 59 ൃใ 59 59 59 సૹ సૹ 59 59 59 సૹ సૹ సૹ సૹ స ૹ

ೋॏࢧ෷͍໰୊ ΞϦε͸Ωϟϩϧ͔Β΋Βͬͨ#5$ΛϘϒʹ΋ૹΓɺΤϨϯʹ΋ૹͬͨͱ͢Δʢೋॏࢧ෷͍Λͨ͠ʣ ͲͪΒͷτϥϯβΫγϣϯΛਖ਼౰ͱݟͳ͔͢ ؅ཧऀ͕͍Ε͹؅ཧऀͷϊʔυʹಧ͍ͨઌணॱͰܾΊΕ͹ྑ͍ ͔͠͠ɺ؅ཧऀͷ͍ͳ͍෼ࢄωοτϫʔΫͰ͜ͷରࡦΛ͠ͳ͚Ε͹ͳΒͳ͍ 11ωοτϫʔΫ্Ͱઌணॱͷ൑ఆ͸ෆՄೳ 7 ΞϦε Ϙϒ 59
5PϘϒ 59 5PΤϨϯ Ωϟϩϧ ΤϨϯ #5$ #5$ #5$ ೋॏࢧ෷͍ Ϙϒ ΤϨϯ

ೋॏࢧ෷͍ΛແޮԽ͢Δʹ͸ʁ ೋॏࢧ෷͍ΛແޮԽ͢ΔͨΊʹɺ6590͕࢖༻ࡁΈͰ͋Δ͔ͷ൑ఆ͕ඞཁ ࢖༻ࡁΈͰ͋Δ͜ͱ͸ɺܝࣔ൘ʹ·ͱΊͯ஌ΒͤΔ ϒϩοΫ͸ެ༻ܝࣔ൘ 8 ࢖༻ࡁΈ6590Ұཡ ΞϦεˠϘϒ#5$ ΤϨϯˠΩϟϩϧ#5$ ΩϟϩϧˠσϏοτ#5$ ΩϟϩϧˠΞϦε#5$
ϘϒˠΤϨϯ#5$

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 1SPPGPG8PSLʢ1P8ɿ࡞ۀূ໌ʣͱ͍͏
w େมͳ࡞ۀΛ͢Δਓ͸ωοτϫʔΫҡ࣋ʹߩݙ͢Δͱ͍͏ΠϯηϯςΟϒʹجͮ͘ w ࣮ࡍ͸ઃඋඅͱిؾ୅͕͔͔Δ &UIFSFVN͸1P8͔Β1SPPGPG4UBLFʢ1P4ʣʹҠߦͯ͠ɺϚΠχϯάͰ͸ͳ͘ɺόϦσʔτΛߦ͏ w ࢿۚΛ͍࣋ͬͯΔਓ͸ωοτϫʔΫҡ࣋ʹߩݙ͢Δͱ͍͏ΠϯηϯςΟϒʹجͮ͘ 9

ϚʔΫϧϧʔτ ϒϩοΫͷߏ଄ ϒϩοΫʹؚΊΔτϥϯβΫγϣϯΛ·ͱΊͨϚʔΫϧϧʔτΛܭࢉ 59͕ͲͷϒϩοΫʹೖ͍ͬͯΔ͔͕Θ͔Δ ϒϩοΫϔομͱτϥϯβΫγϣϯ͕ϒϩοΫʹؚ·ΕΔ ʮφϯεʯͱ͍͏ԿͰ΋ྑ͍ύϥϝʔλΛೖΕͯϒϩοΫͷϋογϡΛܭࢉ ͦͷ಄/ܻ͕શͯʹͳΔ·Ͱʢਐ਺ͳͷͰɺ֬཰͸ͷ/৐ʣ ͘͢͝௿͍֬཰ʢྫ͑ΔͳΒܻ͋ΔμΠϠϧϩοΫΛຖճ਺ࣈม͑ͯղৣͰ͖Δ͔ࢼ͢ʣ 10 લͷϒϩοΫͷϋο
γϡ લͷϒϩοΫ ͷϔομ λΠϜελϯϓ φϯε ϒϩοΫͷϋογϡ GFCGEFGEGEECCDEF CFC ͻͨ͢Βม͑ͯ ϒϩοΫϋογϡΛܭࢉ 59 59 59 59 59 59

ϒϩοΫ͸લͷϒϩοΫΛϋογϡϙΠϯλͰࢀরͯ͠ (FOFTJT#MPDL ͔Β࠷৽ͷϒϩοΫ·Ͱܨ͕͍ͬͯΔ ్தͷϒϩοΫʹऔΓࠐ·Ε͍ͯΔτϥϯβΫγϣϯͷத਎Λมߋ͢Δʹ͸ɺϒϩοΫͷ࡞Γ௚͠ͱޙଓͷϒϩοΫΛ࡞ Γ௚͞ͳ͚Ε͹ͳΒͳ͍ w ϏοτͰ΋ม͑Δͱɺϋογϡ஋͕શ͘ҟͳΔͷͱɺϒϩοΫΛ࡞Γ௚͢ϚΠχϯά΋ඞཁͰɺվ͟Μ͸ࠔ೉ ϒϩοΫνΣʔϯ 11 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

೉қ౓ௐ੔ͱใु ϒϩοΫͷϋογϡ಄/ܻ͕Ͱ͋Δ͔ʢ೉қ౓ʣ͸ϒϩοΫ͔͔ͬͨ࣌ؒΛ ෼ ೔िؒ ͱൺֱܾͯ͠Ί Δ ̍ϒϩοΫ࡞Δͷʹฏۉ෼ ೉қ౓Λ্͛Δʹ͸ϋογϡλʔήοτΛখ͘͢͞Δɺ೉қ౓ΛԼ͛ΔͳΒେ͖͘͢Δ ϒϩοΫใु͸ (FOFTJT#MPDL
͕#5$ɺ Ͱ#5$ɺ Ͱ#5$ͱ͍͏Α͏ʹ ϒϩο Ϋ͝ͱʹใु൒ݮ ϏοτίΠϯΛ৽نൃߦ͍ͯ͠Δ ໿̐೥ʹ̍ճՆقޒྠͷ೥ͷՆࠒʹ൒ݮ͢Δ ೥Նʹ ϒϩοΫͰɺ#5$͔Β#5$ʹ൒ݮ ೥ʹ৽نൃߦ͕ऴΘΓɺ૯ֹສ#5$ͱͳΔ ݶΓ͋Δۚ ΰʔϧυ ͷ࠾۷ ϚΠχϯά ʹͳͧΒ͑ͯϒϩοΫੜ੒࡞ۀͷΛϚΠχϯάͱݺͿ w &UIFSFVN͸όϦσʔτɺόϦσʔτ͢ΔϊʔυΛόϦσʔλͱݺͿ 12

&UIFSFVNʢΠʔαϦΞϜʣ

&UIFSFVNͷ͸͡·Γ ϏοτίΠϯͷج൫ٕज़ʢޙʹʮϒϩοΫνΣʔϯʯͱݺ͹ΕΔΑ͏ʹͳΔʣΛ༻͍ͯ৽͍͠νΣʔϯΛఏҊ IUUQTFUIFSFVNPSHFOXIJUFQBQFS೥ʹൃද͞ΕͨϗϫΠτϖʔύʔ 14

෼ࢄΞϓϦέʔγϣϯ %"QQT ϒϩοΫνΣʔϯ্ͷ59ΛΞϓϦέʔγϣϯʹஔ͖׵͑ͯߟ͑Δ ΠʔαϦΞϜϒϩοΫνΣʔϯ্ͰՔಇ͢ΔεϚʔτίϯτϥΫτ͕σϓϩΠ͞ΕΔͱɺͦͷσʔλ΋શੈքͷ෼ࢄ୆ாʹ ه࿥͞ΕΔ ʮۭத໿ଋݻఆ૷ஔʯCZ੪౻ݡ࣐ૣҴాେڭत 15 ΞϦε σϓϩΠ సૹ
సૹ సૹ సૹ సૹ స ૹ %"QQ %"QQ %"QQ %"QQ %"QQ %"QQ %"QQ సૹ Ϙϒ ࢖༻Մೳ Ωϟϩϧ σϏοτ ࢖༻Մೳ ࢖༻Մೳ ࢖༻Մೳ

%BQQͷཁૉ %BQQͷཁૉʢʮϚελϦϯάɾΠʔαϦΞϜʯ1ΑΓʣ όοΫΤϯυʢεϚʔτίϯτϥΫτʣ ϑϩϯτΤϯυʢ8FC6*ʣ σʔλετϨʔδ ϝοηʔδ௨৴ ໊લղܾ 16 https://github.com/ethereumbook/ethereumbook/blob/develop/12dapps.asciidoc

%BQQͷσʔλετϨʔδ εϚʔτίϯτϥΫτ͸େྔͷσʔλͷอ؅΍ॲཧʹ͸ద͍ͯ͠ͳ͍ ΦϑνΣʔϯͷσʔλετϨʔδαʔϏεΛར༻ *1'4΍4XBSNͳͲ11ετϨʔδΛར༻͢Δͱඇதԝूݖతʹ؅ཧՄೳ ը૾ɺϏσΦɺΞϓϦέʔγϣϯͷϑϩϯτΤϯυ8FCΠϯλʔϑΣʔεʢ)5.-ɺ$44ɺ+BWB4DSJQUͳͲʣେن໛ͳ੩త Ξηοτͷ֨ೲ΍഑෍ʹ࠷ద 17

*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
18 ϋογϡ ίϯςϯπΞυϨοαϒϧͷΠϝʔδ *%

&3$τʔΫϯʹ*1'4ͰΞΠίϯ෇༩ ը૾ϑΝΠϧΛ*1'4ʹ֨ೲͨ͠ޙɺ*1'4ͷ*%ΛτʔΫϯDPOUSBDUͷJDPOʹࢦఆͯ͠σϓϩΠ IUUQTJQGTJPJQGT2N4C6/NH7:%N[Q)JL4J.R[U3BN(J&HOK8[Z8EFX2P ೥݄ࠒʹΞοϓϩʔυ͕ͨ͠ະͩ࢒͍ͬͯΔ ٯʹɺ೥ਖ਼݄ʹ΋Βͬͨ೥լঢ়/'5ͷը૾͸ফ͍͑ͯͨ 19 $ ipfs add toka.png
added QmS9bUNmgVYD1mzpHikSiMqztRa7mGiEgnjW3zyWdew1Qo toka.png 50.82 KiB / 50.82 KiB [=========================================================================================== ===============================================================================] 100.00% 5FTUOFU 3PQTUFO Ͱ&3$ͷΞΠίϯʹઃఆ

4XBSN *1'4ʹྨࣅͨ͠ίϯςϯτΞυϨοαϒϧ11ετϨʔδγεςϜ &UIFSFVN'PVOEBUJPOʹΑͬͯHFUIπʔϧͷҰ෦ͱͯ͠࡞੒ *1'4ͱಉ༷ʹϑΝΠϧΛ֨ೲ ϑϩϯτΤϯυͷιʔείʔυ΋4XBSNʹ֨ೲͯ͠தԝαʔόͰ͸ͳ͘ɺ11γεςϜ͔Β8FCαΠτʹΞΫηεͰ͖ΔΑ ͏ʹ 20

4XBSN &UIFSTDBOͷ$POUSBDU4PVSDF$PEF΋4XBSNʹอ؅͞Ε͍ͯΔ $POUSBDUιʔείʔυͷόΠφϧͱϒϩοΫνΣʔϯʹσϓϩΠ͞ΕͨόΠφϦͷҰகݕূ 21 $POUSBDU $PEF $POUSBDU όΠφϦ ίϯ ύΠϧ

%BQQ εϚʔτίϯτϥΫτ αʔόʔαΠυ ϑϩϯτΤϯυ 4XBSNʹ֨ೲ ඇதԝूݖܕσʔλετϨʔδɿ*1'4ɺ4XBSN ඇதԝूݖܕϝοηʔδ௨৴ϓϩτίϧɿ8IJTQFS ϒϩοΫνΣʔϯͰߦ͏ඞཁͷͳ͍௨৴Λ୲౰ ඇதԝूݖܕωʔϜαʔϏε
໊લղܾ ɿ&/4 &UIFSFVN/BNF4FSWJDF શͯΛ11ඇதԝूݖͰಈ͔͢ɿ8FC 22

εϚʔτίϯτϥΫτʙ&3$Λྫʹʙ

&3$ͷϕʔγοΫͳؔ਺ UPUBM4VQQMZɿݱࡏଘࡏ͢ΔτʔΫϯͷ߹ܭ਺Λฦ͢ CBMBODF0Gɿࢦఆ͞ΕͨΞυϨεͷτʔΫϯ࢒ߴΛฦ͢ USBOTGFSɿΞυϨεͱֹۚΛࢦఆ͠ɺ࣮ߦͨ͠ΞυϨε͔Βૹۚ͢Δ OBNFɿz#BTJD"UUFOUJPO5PLFOz l$IBJOMJOLz l.BLFSzͳͲਖ਼໊ࣜশΛݺͼग़͢ TZNCPMɿ#"5 0.( -*/,
.,3 #0#"ͳͲςΟοΧʔΛݺͼग़͢ %FDJNBMTɿখ਺఺ҎԼԿܻ·Ͱ෼ׂͰ͖Δ͔ઃఆʢ&5)ͱಉ͕͘͡ଟ͍ʣ 5SBOTGFSɿૹ͕ۚ੒ޭͨ͠ͱ͖ʹτϦΨʔ͞ΕΔΠϕϯτ 24

&3$ͷجຊؔ਺ਤղ σϓϩΠ࣌΍ૹۚ࣌ʹ͸&5)Λख਺ྉͱͯ͠ফඅʢ&3$τʔΫϯ͸ݮΒͳ͍ʣ 25 ᶄUSBOTGFS ᶅUSBOTGFS ΞϦε Ϙϒ Ωϟϩϧ &5)ɿΨεʢख਺ྉʣ ΞϦεˠόϦσʔλ
ᶃσϓϩΠ࣌ʹ ൃߦ ΞϦεͷࢧ෷͏ Ψε Ϙϒͷࢧ෷͏ Ψε "MJDF$PJO "-$

&3$ͷҕ೚Λ͢Δஈ֊ϫʔΫϑϩʔؔ਺ͱΠϕϯτ BQQSPWFɿΞϦεͷ͍࣋ͬͯΔτʔΫϯͷ͏ͪࢦఆֹͨ͠಺ͰϘϒʹૹۚݖݶ෇༩͕Մೳ Ϙϒ͸͍࣋ͬͯͳͯ͘Α͍ USBOTGFS'SPNɿBQQSPWFޙɺϘϒ͸ΞϦεͷ࣋ͭτʔΫϯΛΩϟϩϧʹૹۚ ϘϒͷτʔΫϯ͸࢖༻͠ͳ͍ Ψε͸Ϙϒ͕ࢧ෷͏ BMMPXOBODFɿϘϒ͕ΞϦε͔ΒҾ͖ग़ͤΔֹۚΛฦ͢ "QQSPWBMɿBQQSPWFؔ਺ͷݺͼग़͕͠੒ޭͨ͠ͱ͖ʹϩάΛग़ྗ͢ΔΠϕϯτ 26

&3$ͷҕ೚ؔ਺ਤղ Ϙϒ͸ࣗ෼͕"MJDF$PJOʢ"-$ʣΛ͍࣋ͬͯͳͯ͘΋ɺΞϦε͔Β"QQSPWF͞Εͯҕ೚Λड͚͍ͯΕ͹ɺҕ೚ֹͷൣғͰૹ ͕ۚͰ͖Δ 27 ᶃ"QQSPWF ᶄUSBOTGFS'SPN ΞϦε Ϙϒ Ωϟϩϧ "QQSPWF࣌ͷΨε͸
ΞϦε͕෷͏ USBOTGFS'SPN ࣮ߦ࣌ͷΨε͸ Ϙϒ͕ࢧ෷͏ "-$ҕ೚ ΞϦε͸ "-$ ॴ༗ "-$ҎԼ Λҕ೚ૹۚՄೳ ᶄ ࣮ ߦ "MJDF$PJO "-$

&3$ίϯτϥΫτ΁ͷҕ೚ ҕ೚ઌ͸ਓͰ͸ͳ͘ɺίϯτϥΫτͰ΋Մೳ 28 ᶃ"QQSPWF ᶅUSBOTGFS'SPN ᶄྫ͑͹ɺ&5)ૹۚʹΑͬͯ USBOTGFS'SPNΛݺͼग़͢ ΞϦε ίϯτϥΫτ Ωϟϩϧ
"-$ҕ೚ ΞϦε͸ "-$ ॴ༗ "MJDF$PJO "-$ ࢧ෷͏Ψε &5)ૹۚͷΨε USBOTGFS'SPN࢖༻෼ "-$ҎԼ Λҕ೚ૹۚՄೳ

&3$։ൃͷϋϯζΦϯ ΠϕϯτDPOOQBTTϖʔδ IUUQTDSZQUPDVSSFODZDPOOQBTTDPNFWFOU w ࢿྉϦϯΫɺΞʔΧΠϒಈըϦϯΫ΋ܝࡌ &3$Λ৮ͬͨޙʹ&3$Λ৮Δํ͕Θ͔Γ΍͍͢ 29

/'5 /PO'VOHJCMF5PLFOʢඇ୅ସੑτʔΫϯʣ #5$ &5) &3$τʔΫϯͳͲ͸'VOHJCMF5PLFO '5͸ൃߦྔ͕೚ҙʢຕҎ্ʣͰɺ෼ׂՄೳʢখ਺఺ҎԼͷิॿ୯Ґ͕͋ΔʣʹͰ͖Δ /'5͸ൃߦྔ͕Ͱɺ෼ׂෆՄೳ τʔΫϯʹ*%Λৼ͍ͬͯΔύλʔϯ ͦΕͧΕͷݸମ͸/'5ͱΈͳ͢ /'5Ͱॴ༗ݖҠస௥੻ͷಁ໌Խ
31

&3$ͷؔ਺ʢ̍ʣ ݱࡏͷঢ়ଶΛऔಘ CBMBODF0Gɿ@PXOFS͕อ༗͍ͯ͠ΔݱࡏͷτʔΫϯͷݸ਺Λฦ͢ PXOFS0Gɿ@UPLFO*EͰࢦఆ͞Ε͍ͯΔτʔΫϯͷอ༗ऀͷΞυϨεΛฦ͢ Ҡస USBOTGFS'SPNɿ@GSPN͔Β@UPʹɺ@UPLFO*EͰࢦఆ͞ΕͨτʔΫϯΛҠస TBGF5SBOTGFS'SPNɿUSBOTGFS'SPNʹՃ͑ͯɺ@UPʢѼઌʣ͕ίϯτϥΫτΞυϨεͷ৔߹ɺ/'5डऔΛαϙʔτ͍ͯ͠ ͳ͍ͱૹΕͳ͍ ҕ೚ BQQSPWFɿ@BQQSPWFEʹࢦఆͨ͠ΞυϨεʹରͯ͠ɺ@UPLFO*EͰࣝผ͢ΔಛఆͷτʔΫϯΛҠస͢ΔݖརΛ෇༩
HFU"QQSPWFEɿࢦఆ͞ΕͨτʔΫϯʹରͯ͠ɺݱࡏ༗ޮʹͳ͍ͬͯΔಛఆτʔΫϯͷ୅ཧऀΛऔಘ 32

&3$ͷؔ਺ʢ̎ʣ શݖҕ೚ TFU"QQSPWBM'PS"MMɿ@PQFSBUPSʹࢦఆͨ͠ΞυϨεʹରͯ͠ɺશݖҕ೚͢Δ͔൱͔Λ@BQQSPWFEͰࢦఆɻෳ਺ͷҟͳΔ @PQFSBUPSʹରͯ͠ɺಉ࣌ʹશݖҕ೚͕Մೳɻશݖҕ೚Λऔফ͢ʹ͸औΓফ͍ͨ͠ΞυϨεΛ@PQFSBUPSʹɺ@BQQSPWFE ʹGBMTFΛ౉͢ JT"QQSPWBM'PS"MMɿ@PXOFS͕@PQFSBUPSʹରͯ͠શݖ୅ཧΛڐՄ͍ͯ͠Δ͔Λฦ͢ &3$ൃߦʹ0QFO;FQQFMJOΛ࢖͏ͱΘ͔Γ΍͍͢ IUUQTHJUIVCDPN0QFO;FQQFMJOPQFO[FQQFMJODPOUSBDUTUSFFNBTUFSDPOUSBDUTUPLFO&3$ IUUQTEPDTPQFO[FQQFMJODPNDPOUSBDUTYFSD 33

&3$Λൃߦ IUUQTXJ[BSEPQFO[FQQFMJODPNFSDศརαΠτͰίʔυΛੜ੒ɺίϐϖ IUUQTSFNJYFUIFSFVNPSH3FNJYͰσϓϩΠ &3$͸σϓϩΠ͚ͨͩ͠Ͱ͸ൃߦ͞Εͳ͍ σϓϩΠ࣌ʹ͸ரܕ͕Ͱ͖Δ͚ͩ TBGFNJOUͰൃߦ 34

0QFO4FB5FTUOFUTͰ༡ΜͰΈΔ IUUQTUFTUOFUTPQFOTFBJPBDDPVOU .FUBNBTLΛೖΕͯɺ(PFSMJ5FTUOFUͰ઀ଓ IUUQTHPFSMJGBVDFUDPN 'BVDFU ऄޱ͹Βࢃ͖ॴ Ͱ5FTUOFUίΠϯΛೖख 35

ࢀߟจݙ ஛Ҫ༔ਓஶʮపఈղઆ/'5ͷཧ࿦ͱ࣮ફʯΦʔϜࣾ ʹϏοτίΠϯͱ͔ษڧձͰஶऀΛ͓ট͖͠ɺॻ੶঺հͷษڧձΛ࣮ࢪ w ΞʔΧΠϒಈըެ։४උத "OESFBT."OUPOPQPVMPT (BWJO8PPEஶ   Ӊ໺խ੖ ോ֋३Ұ࿠؂༁ɹத৓ݩਉ
མ߹বޛٕज़؂मɹམ߹༱հ   খྛହஉ ౔԰य़थ ೠ௡੣ߊ ฏࢁᠳ ࡾ௡ᖒαϧόυʔϧক࢘ ࢁޱ࿨ً༁   ʮϚελϦϯάɾΠʔαϦΞϜεϚʔτίϯτϥΫτͱ%"QQͷߏஙʯΦϥΠϦʔɾδϟύϯ #JUDPJO"1FFSUP1FFS&MFDUSPOJD$BTI4ZTUFN IUUQTCJUDPJOPSHCJUDPJOQEG ΞϯυϨΞεɾ.ɾΞϯτϊϓϩεஶࠓҪਸ໵ ോ֋३Ұ࿠༁   ʮϏοτίΠϯͱϒϩοΫνΣʔϯ҉߸௨՟Λࢧ͑Δٕज़ʯ/55ग़൛ ࢁ࡚ॏҰ࿠ ҆౔ໜږ ాதढ़ଠ࿠ஶ   ʰϒϩοΫνΣʔϯɾϓϩάϥϛϯάԾ૝௨՟ೖ໳ʱߨஊࣾ ࢁ࡚ॏҰ࿠ ҆౔ໜږ ۚࢠ༤հ ௕ాൟ޾ஶ   ʰϒϩοΫνΣʔϯٕज़֓࿦ཧ࿦ͱ࣮ફʱߨஊࣾ 36

NFT技術概論

NFT技術概論

Shu Kobuchi

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/'5ٕज़֓࿦ ೥݄೔!04$ژ౎0OMJOF ೔ຊ҉߸௨՟Ϣʔβձɹখᔹप 4IV,PCVDIJ

ίϛϡχςΟ঺հ ೔ຊ҉߸௨՟ϢʔβձɹIUUQTDSZQUPDVSSFODZDPOOQBTTDPN ʮϏοτίΠϯͱ͔ษڧձʯ ʮ҉߸௨՟ಡॻձʯ w গͳ͘ͱ΋ͲͪΒ͔Λ݄ҰճͰ։࠵ :PV5VCFͰΞʔΧΠϒࢹௌՄೳIUUQCJUMZZPVUVCFDDTUVEZ w νϟϯωϧొ࿥͓ئ͍͠·͢ʂ 3

ΞδΣϯμ ϒϩοΫνΣʔϯ ΠʔαϦΞϜ εϚʔτίϯτϥΫτ %BQQTʢ&3$Λྫʹʣ ίϯςϯπͷϗεςΟϯά *1'4 &3$ 4

ϒϩοΫνΣʔϯʙೋॏࢧ෷໰୊ʙ ϏοτίΠϯ͕ղܾͨ͠ೋॏࢧ෷໰୊Λղઆ

11ωοτϫʔΫͰͷసૹ ࡞੒ͨ͠τϥϯβΫγϣϯΛϏοτίΠϯ11ωοτϫʔΫʹϒϩʔυΩϟετ ൃใ ͢Δ ϊʔυ͸59ͷܗࣜΛνΣοΫ͠ɺϏοτίΠϯͷܗࣜͱͯ͠ਖ਼͚͠Ε͹ɺྡͷϊʔυʹసૹ͍ͯ͘͠ શͯͷϊʔυ͕ಉ͡59Λ࣋ͭ   ʢશੈքͷϊʔυʹߦ͖౉Δʣ 6 ΞϦε

ೋॏࢧ෷͍ΛແޮԽ͢Δʹ͸ʁ ೋॏࢧ෷͍ΛແޮԽ͢ΔͨΊʹɺ6590͕࢖༻ࡁΈͰ͋Δ͔ͷ൑ఆ͕ඞཁ ࢖༻ࡁΈͰ͋Δ͜ͱ͸ɺܝࣔ൘ʹ·ͱΊͯ஌ΒͤΔ ϒϩοΫ͸ެ༻ܝࣔ൘ 8 ࢖༻ࡁΈ6590Ұཡ ΞϦεˠϘϒ#5$ ΤϨϯˠΩϟϩϧ#5$ ΩϟϩϧˠσϏοτ#5$ ΩϟϩϧˠΞϦε#5$

೉қ౓ௐ੔ͱใु ϒϩοΫͷϋογϡ಄/ܻ͕Ͱ͋Δ͔ʢ೉қ౓ʣ͸ϒϩοΫ͔͔ͬͨ࣌ؒΛ ෼ ೔िؒ ͱൺֱܾͯ͠Ί Δ ̍ϒϩοΫ࡞Δͷʹฏۉ෼ ೉қ౓Λ্͛Δʹ͸ϋογϡλʔήοτΛখ͘͢͞Δɺ೉қ౓ΛԼ͛ΔͳΒେ͖͘͢Δ ϒϩοΫใु͸ (FOFTJT#MPDL

&UIFSFVNʢΠʔαϦΞϜʣ

&UIFSFVNͷ͸͡·Γ ϏοτίΠϯͷج൫ٕज़ʢޙʹʮϒϩοΫνΣʔϯʯͱݺ͹ΕΔΑ͏ʹͳΔʣΛ༻͍ͯ৽͍͠νΣʔϯΛఏҊ IUUQTFUIFSFVNPSHFOXIJUFQBQFS೥ʹൃද͞ΕͨϗϫΠτϖʔύʔ 14

%BQQͷཁૉ %BQQͷཁૉʢʮϚελϦϯάɾΠʔαϦΞϜʯ1ΑΓʣ όοΫΤϯυʢεϚʔτίϯτϥΫτʣ ϑϩϯτΤϯυʢ8FC6*ʣ σʔλετϨʔδ ϝοηʔδ௨৴ ໊લղܾ 16 https://github.com/ethereumbook/ethereumbook/blob/develop/12dapps.asciidoc

&3$τʔΫϯʹ1'4ͰΞΠίϯ෇༩ ը૾ϑΝΠϧΛ1'4ʹ֨ೲͨ͠ޙɺ1'4ͷ%ΛτʔΫϯDPOUSBDUͷJDPOʹࢦఆͯ͠σϓϩΠ IUUQTJQGTJPJQGT2N4C6/NH7:%N[Q)JL4J.R[U3BN(J&HOK8[Z8EFX2P ೥݄ࠒʹΞοϓϩʔυ͕ͨ͠ະͩ࢒͍ͬͯΔ ٯʹɺ೥ਖ਼݄ʹ΋Βͬͨ೥լঢ়/'5ͷը૾͸ফ͍͑ͯͨ 19 $ ipfs add toka.png

4XBSN 1'4ʹྨࣅͨ͠ίϯςϯτΞυϨοαϒϧ11ετϨʔδγεςϜ &UIFSFVN'PVOEBUJPOʹΑͬͯHFUIπʔϧͷҰ෦ͱͯ͠࡞੒ 1'4ͱಉ༷ʹϑΝΠϧΛ֨ೲ ϑϩϯτΤϯυͷιʔείʔυ΋4XBSNʹ֨ೲͯ͠தԝαʔόͰ͸ͳ͘ɺ11γεςϜ͔Β8FCαΠτʹΞΫηεͰ͖ΔΑ ͏ʹ 20

4XBSN &UIFSTDBOͷ$POUSBDU4PVSDF$PEF΋4XBSNʹอ؅͞Ε͍ͯΔ $POUSBDUιʔείʔυͷόΠφϧͱϒϩοΫνΣʔϯʹσϓϩΠ͞ΕͨόΠφϦͷҰகݕূ 21 $POUSBDU $PEF $POUSBDU όΠφϦ ίϯ ύΠϧ

%BQQ εϚʔτίϯτϥΫτ αʔόʔαΠυ ϑϩϯτΤϯυ 4XBSNʹ֨ೲ ඇதԝूݖܕσʔλετϨʔδɿ*1'4ɺ4XBSN ඇதԝूݖܕϝοηʔδ௨৴ϓϩτίϧɿ8IJTQFS ϒϩοΫνΣʔϯͰߦ͏ඞཁͷͳ͍௨৴Λ୲౰ ඇதԝूݖܕωʔϜαʔϏε

εϚʔτίϯτϥΫτʙ&3$Λྫʹʙ

&3$ͷϕʔγοΫͳؔ਺ UPUBM4VQQMZɿݱࡏଘࡏ͢ΔτʔΫϯͷ߹ܭ਺Λฦ͢ CBMBODF0Gɿࢦఆ͞ΕͨΞυϨεͷτʔΫϯ࢒ߴΛฦ͢ USBOTGFSɿΞυϨεͱֹۚΛࢦఆ͠ɺ࣮ߦͨ͠ΞυϨε͔Βૹۚ͢Δ OBNFɿz#BTJD"UUFOUJPO5PLFOz l$IBJOMJOLz l.BLFSzͳͲਖ਼໊ࣜশΛݺͼग़͢ TZNCPMɿ#"5 0.( -*/,

&3$ͷجຊؔ਺ਤղ σϓϩΠ࣌΍ૹۚ࣌ʹ͸&5)Λख਺ྉͱͯ͠ফඅʢ&3$τʔΫϯ͸ݮΒͳ͍ʣ 25 ᶄUSBOTGFS ᶅUSBOTGFS ΞϦε Ϙϒ Ωϟϩϧ &5)ɿΨεʢख਺ྉʣ ΞϦεˠόϦσʔλ

&3$ͷҕ೚ؔ਺ਤղ Ϙϒ͸ࣗ෼͕"MJDF$PJOʢ"-$ʣΛ͍࣋ͬͯͳͯ͘΋ɺΞϦε͔Β"QQSPWF͞Εͯҕ೚Λड͚͍ͯΕ͹ɺҕ೚ֹͷൣғͰૹ ͕ۚͰ͖Δ 27 ᶃ"QQSPWF ᶄUSBOTGFS'SPN ΞϦε Ϙϒ Ωϟϩϧ "QQSPWF࣌ͷΨε͸

&3$ίϯτϥΫτ΁ͷҕ೚ ҕ೚ઌ͸ਓͰ͸ͳ͘ɺίϯτϥΫτͰ΋Մೳ 28 ᶃ"QQSPWF ᶅUSBOTGFS'SPN ᶄྫ͑͹ɺ&5)ૹۚʹΑͬͯ USBOTGFS'SPNΛݺͼग़͢ ΞϦε ίϯτϥΫτ Ωϟϩϧ

&3$։ൃͷϋϯζΦϯ ΠϕϯτDPOOQBTTϖʔδ IUUQTDSZQUPDVSSFODZDPOOQBTTDPNFWFOU w ࢿྉϦϯΫɺΞʔΧΠϒಈըϦϯΫ΋ܝࡌ &3$Λ৮ͬͨޙʹ&3$Λ৮Δํ͕Θ͔Γ΍͍͢ 29

&3$

&3$Λൃߦ IUUQTXJ[BSEPQFO[FQQFMJODPNFSDศརαΠτͰίʔυΛੜ੒ɺίϐϖ IUUQTSFNJYFUIFSFVNPSH3FNJYͰσϓϩΠ &3$͸σϓϩΠ͚ͨͩ͠Ͱ͸ൃߦ͞Εͳ͍ σϓϩΠ࣌ʹ͸ரܕ͕Ͱ͖Δ͚ͩ TBGFNJOUͰൃߦ 34

0QFO4FB5FTUOFUTͰ༡ΜͰΈΔ IUUQTUFTUOFUTPQFOTFBJPBDDPVOU .FUBNBTLΛೖΕͯɺ(PFSMJ5FTUOFUͰ઀ଓ IUUQTHPFSMJGBVDFUDPN 'BVDFU ऄޱ͹Βࢃ͖ॴ Ͱ5FTUOFUίΠϯΛೖख 35

ࢀߟจݙ ஛Ҫ༔ਓஶʮపఈղઆ/'5ͷཧ࿦ͱ࣮ફʯΦʔϜࣾ ʹϏοτίΠϯͱ͔ษڧձͰஶऀΛ͓ট͖͠ɺॻ੶঺հͷษڧձΛ࣮ࢪ w ΞʔΧΠϒಈըެ։४උத "OESFBT."OUPOPQPVMPT (BWJO8PPEஶ   Ӊ໺խ੖ ോ֋३Ұ࿠؂༁ɹத৓ݩਉ