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Libraの現状と技術面をざっくりと / astudy20191114

Libraの現状と技術面をざっくりと / astudy20191114

アスクル社内勉強会で発表した資料です!

Akihito Nakano

November 14, 2019
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  1. த໺ڿਓΞεΫϧגࣜձࣾ
    "4UVEZ ΞεΫϧࣾ಺ษڧձ

    -JCSBͷݱঢ়ͱٕज़໘Λͬ͘͟Γͱ
    ʙιϑτ΢ΣΞʹҿΈࠐ·Ε͍ͯ͘ੈքʹੜ͖Δࢲͨͪʙ

    View full-size slide

  2. 8FCΞϓϦέʔγϣϯΤϯδχΞ
    த໺ڿਓ
    IUUQTBDLJOUPTIHJUIVCJPBCPVU
    BDLJOUPTI
    /","/0@"LJIJUP

    View full-size slide

  3. 044׆ಈ
    w0QFO"1*(FOFSBUPS
    wIUUQTHJUIVCDPN0QFO"1*5PPMTPQFOBQJHFOFSBUPS
    w(BOFTIB Ψωʔγϟ

    wIUUQTHJUIVCDPNBDLJOUPTIHBOFTIB
    w4OJEFM εφΠσϧ

    wIUUQTHJUIVCDPNBDLJOUPTITOJEFM

    View full-size slide

  4. ໨࣍
    w ൃදͷΰʔϧ
    w ֓ཁͱݱঢ়
    w ໨త
    w खஈ
    w ݱঢ়
    w ٕज़໘
    w ߹ҙΞϧΰϦζϜ
    w σʔλߏ଄
    w ͓ΘΓʹ
    ɾॳ०࣌఺ͷ৘ใ
    ɾઈࢍΩϟονΞοϓதͳͷͰ
    ɹཧղ͕ؒҧͬͯΔͱ͜Ζ͕͋ͬͨΒ͝ΊΜͳ͍͞ʂ

    View full-size slide

  5. ൃදͷΰʔϧ
    w ͍··ͰΩϟονΞοϓͯ͠ͳ͔ͬͨͻͱʹ
    w -JCSBͬͯͦ͏͍͏ײ͡ͳͷͶʂͱࢥͬͯ΋Β͏͜ͱ
    ɾ-JCSBʹ͍ͭͯ͸൱ఆ΋ߠఆ΋͠·ͤΜ
    ɾϒϩοΫνΣʔϯ·ΘΓͷٕज़ʹڵຯ͕͋Δਓ͕ؒ-JCSBʹ͍ͭͯ
    ·ͱΊͯΈ·ͨ͠ɺͱ͍͏ൃදͰ͢

    View full-size slide

  6. ໨࣍
    w ൃදͷΰʔϧ
    w ֓ཁͱݱঢ়
    w ໨త
    w खஈ
    w ݱঢ়
    w ٕज़໘
    w ߹ҙΞϧΰϦζϜ
    w σʔλߏ଄
    w ͓ΘΓʹ

    View full-size slide

  7. -JCSB
    w 'BDFCPPL͕։ൃΛओಋ͍ͯ͠ΔԾ૝௨՟ ҉߸ࢿ࢈
    ϓϩδΣΫτ
    w ൃද
    w IUUQTMJCSBPSH
    w ϗϫΠτϖʔύʔIUUQTMJCSBPSHXIJUFQBQFS
    w ςΫχΧϧϖʔύʔIUUQTEFWFMPQFSTMJCSBPSHEPDTUIFMJCSBCMPDLDIBJOQBQFS

    View full-size slide

  8. ໨త
    w ਺ेԯͷਓͼͱʹྗΛ༩͑ΔɺγϯϓϧͰάϩʔόϧͳ௨՟ͱۚ༥Πϯϑϥ
    IUUQTMJCSBPSH

    View full-size slide

  9. ໨త
    w 4.4ฒΈͷखܰ͞ͱ҆͞Ͱ͓ۚΛૹΕΔΑ͏ʹͳΔ΂͖
    IUUQTDBMJCSBDPN

    View full-size slide

  10. ໨త՝୊ײ
    w ԯਓ͕ۜߦޱ࠲Λ΋͍ͬͯͳ͍
    w ஍ٿਓޱશମͷ
    w ւ֎ૹۚͷ஗͞
    w ʙӦۀ೔͘Β͍
    w ݱۚऔҾίετͷߴ͞
    w ࠃࡍؒͷ৔߹ɺฏۉ
    IUUQTMJCSBPSH
    ͜Εʹ͍ͭͯ͸΋͏গ͠ৄ͘͠ௐ΂ͨͷͰ
    ࣍ͷεϥΠυͰ঺հ͠·͢

    View full-size slide

  11. ໨త՝୊ײˠ6OCBOLFEʹ͍ͭͯ
    w ԯਓதࠃɺΠϯυɺύΩελϯʹಛʹଟ͍ ˞

    w ޱ࠲ͷҡ࣋ख਺ྉ͕ߴ͍ ૹۚख਺ྉ͕ߴ͍ͱ͍ͬͨཧ༝΋ ˞

    w ͦͷ͏ͪԯਓ͸ܞଳి࿩Λ͍࣋ͬͯΔ
    w ͨͩ͠ܞଳͱΠϯλʔωοτΞΫηεͷ

    ྆ํΛ͍࣋ͬͯΔਓ͸ͦͷ͏ͪ
    w ˞ΠϯλʔωοτΞΫηεεϚʔτϑΥϯɺ1$ɺωοτΧϑΣͳͲ
    w (MPCBM'JOEFYͷϨϙʔτͰ͸σδλϧϖΠϝϯτ͕

    ༗ޮͰ͋Δ͜ͱʹ͍ͭͯݴٴ͞Ε͍ͯΔ
    5IF(MPCBM'JOEFY%BUBCBTF
    IUUQTHMPCBMpOEFYXPSMECBOLPSH
    ˞

    ˞

    View full-size slide

  12. ໨తظ଴஋
    w ൃల్্ࠃʹஹυϧΛ΋ͨΒ͢
    w ສਓͷ৽͍͠ޏ༻Λ૑ग़
    w ਓʑͷऩೖ͕޲্
    w ۃ౓ͷශࠔΛ࡟ݮ
    IUUQTMJCSBPSH

    View full-size slide

  13. ໨తࢲͨͪͷ฻Β͠΁ͷӨڹ
    w ೔ຊͰ฻Β͍ͯ͠Δࢲͨͪʹͱͬͯ͸՝୊ײʹগ͠ڑ཭Λײ͡Δʁ
    w Έͳ͞Μ͸Ͳ͏ࢥ͍·͔͢ʁ

    View full-size slide

  14. खஈϢʔβʔΠϯλʔϑΣʔε
    w ΢ΥϨοτΞϓϦ$BMJCSB
    w 'BDFCPPLࢠձࣾͰ͋ΓɺϦϒϥڠձͷҰһͰ΋͋Δ$BMJCSB͕ࣾ։ൃ
    w .FTTFOHFS΍8IBUT"QQͱͷ࿈ܞͷՄೳੑ

    View full-size slide

  15. खஈٕज़
    w εςʔϒϧίΠϯ
    w όεέοτ௨՟
    w ௨՟಺༁ͱߏ੒ൺ཰
    w ถυϧɺϢʔϩɺ೔ຊԁɺӳϙϯυɺγϯΨϙʔϧυϧ
    w σϏουɾϚʔΧε$&0͸υϧ΍Ϣʔϩ౳ͱରͰϖοά͢ΔՄೳੑ΋ݴٴ

    w ಠࣗϒϩοΫνΣʔϯ
    w ߹ҙΞϧΰϦζϜ-JCSB#'5ɺεϚʔτίϯτϥΫτݴޠ.PWF

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  16. खஈӡӦମ੍
    w -JCSBڠձ
    w εΠεʹڌ఺
    w $BMJCSBؚࣾΉ༷ʑͳۀքͷࢀՃاۀͰߏ੒
    w /10ͳͲͷඇӦར૊৫΋
    w ൃද౰ॳࣾˠࣾ ઃཱ૯ձ࣌఺

    IUUQTMJCSBPSHFO64BTTPDJBUJPOGPVOEJOH@NFNCFST
    IUUQTMJCSBPSHFO64BTTPDJBUJPODPVODJMQSJODJQMFTPWFSWJFX

    View full-size slide

  17. खஈ։ൃମ੍
    w Φʔϓϯιʔε
    w ͢Ͱʹެ։͞Ε͍ͯΔ
    IUUQTHJUIVCDPNMJCSBMJCSB
    ίϯτϦϏϡʔτ͠·ͨ͠

    View full-size slide

  18. ঢ়گ
    w ౰ॳͷϦϦʔε༧ఆ͸Ԇظ
    w ೥લ൒ˠະఆʁ
    w βοΧʔόʔάࢯ͕ެௌձͰʮۚ༥౰ہͷݒ೦ʹશ໘తʹରॲͰ͖Δ·Ͱ։࢝
    Λ஗ΒͤΔʯͱ໌ݴ
    w ౰ॳൃද͞Ε͍ͯͨࢀՃاۀ͕͍͔ͭ͘୤ୀ
    w ൃද౰ॳࣾ
    ˠࣾ ઃཱ૯ձ࣌఺

    w 1BZ1BMɺFCBZɺ7*4"ɺ.BTUFS$BSEɺTUSJQFɺNFSDBEPQBHPɺ#PPLJOHDPN

    View full-size slide

  19. ঢ়گ
    w ใಓ
    w ถԼӃۚ༥αʔϏεҕһ௕-JCSBͷ։ൃܭըͷఀࢭΛٻΊΔ
    w (࡞ۀ෦ձٞ௕-JCSBɺن੍্ͷݒ೦ղফ͢Δ·Ͱ࣮ݱ͠ͳ͍
    w ถ੓෎͕-JCSBڠձࢀՃاۀ΁จষΛૹ෇
    w (ࡒ຿লɾதۜ૯ࡋձٞʮਂࠁͳϦεΫʹద੾ʹରॲʯ͢Δ·ͰൃߦΛೝΊͳ͍ํ਑
    w ಠ෹ҏ͕-JCSBΛϒϩοΫ͢Δํ਑Λද໌
    w ࠃࡍػؔ౳͔Βग़͞Εͨจॻ
    w (8PSLJOH(SPVQPO4UBCMF$PJOT*OWFTUJHBUJOHUIFJNQBDUPGHMPCBMTUBCMFDPJOT
    w (ࡒ຿େਉɾதԝۜߦ૯ࡋձٞάϩʔόϧɾεςʔϒϧίΠϯʹؔ͢Δ(ϓϨεϦϦʔε
    w '"5'.POFZMBVOEFSJOHSJTLTGSPNlTUBCMFDPJOTzBOEPUIFSFNFSHJOHBTTFUT

    View full-size slide

  20. ঢ়گ
    w ެௌձ
    w Ϧϒϥͷ੹೚ऀσϏουɾϚʔΧεࢯ͕ূݴ
    w ʮΘΕΘΕ͕ߦಈ͠ͳ͚Ε͹ɺՁ஋؍͕ϑΣΠεϒοΫͷͦΕͱ͸·ͬͨ͘ҟͳΔਓʑ͕؅ཧ͢Δσδλ
    ϧ௨՟͕ɺ͙͢͞·ग़ͯ͘Δ͜ͱͰ͠ΐ͏ʯ
    w 'BDFCPPL$&0ϚʔΫɾβοΧʔόʔάࢯ͕ূݴ
    w ʮ΋͠ڐೝՄͳ͠Ͱ-JCSBڠձ͕ܭըΛਐΊΑ͏ͱ͢Ε͹ɺ'BDFCPPL͸ڠձΛ཭୤͢Δʯ
    w ʮ-JCSB͸ૹۚΛ༰қʹ͢Δ͜ͱ͕໨తͰ͋Γɺ๏ఆ௨՟ͱͷڝ߹΍ۚ༥੓ࡦʹӨڹΛٴ΅͢͜ͱ͸ҙਤ
    ͍ͯ͠ͳ͍ʯ
    w ʮถࠃ͕͜ͷ෼໺ΛϦʔυ͠ͳ͚Ε͹ɺଞࠃ͕͢ΔͩΖ͏ɻଞࠃͷ੓෎΍اۀ͸ɺถࠃͱಉ͡ن੍੍౓΍
    ಁ໌ੑʹର͢ΔίϛοτϝϯτΛ࣋ͨͣʹ࣮ߦ͢Δ͔΋͠Εͳ͍ʯ
    &YBNJOJOH'BDFCPPL`T1SPQPTFE$SZQUPDVSSFODZBOE*UT*NQBDUPO &WFOU*%

    IUUQTXXXZPVUVCFDPNXBUDI W;5L$/8X
    "O&YBNJOBUJPOPG'BDFCPPLBOE*UT*NQBDUPOUIF'JOBODJBM4FSWJDF &WFOU*%

    IUUQTXXXZPVUVCFDPNXBUDI WJT5##QM4"

    View full-size slide

  21. ঢ়گݒ೦ͷϙΠϯτ
    w ๏తͳ໌֬͞
    w Ψόφϯεʢཪ෇͚ࢿ࢈΁ͷ౤ࢿɺՁ஋҆ఆԽϝΧχζϜʹ͍ͭͯʣ
    w Ϛωϩϯɺςϩࢿۚڙ༩౳ෆਖ਼ͳࢿۚऔҾʹ࢖ΘΕΔϦεΫ
    w ϓϥΠόγʔอޢ
    w ফඅऀอޢɾ౤ࢿՈอޢ
    w ੫຿্ͷίϯϓϥΠΞϯε
    w ۚ༥੓ࡦ΁ͷѱӨڹ
    w ࠃࡍతͳ௨՟ମ੍΁ͷѱӨڹ
    εςʔϒϧίΠϯʹؔ͢Δ(ٞ௕੠໌
    IUUQXXXCPKPSKQBOOPVODFNFOUTSFMFBTF@SFMEIUN

    View full-size slide

  22. ঢ়گ
    w ΩϟαϦϯɾϙʔλʔࢯ͕CUPLZPͰొஃ
    w ʮڠௐʯΛ܁Γฦ͠ൃݴ͞Ε͍ͯͨ
    w ˠʮ֤ࠃͷن੍౰ہͱे෼ʹڠௐ͠ͳ͕ΒαʔϏε։࢝Λ໨ࢦ͍ͨ͠ʯ
    IUUQTOBWFOVFKQCUPLZP

    View full-size slide

  23. ঢ়گ͜͜·Ͱͷͬ͘͟Γ·ͱΊ
    w ن੍౰ہͳͲ
    w άϩʔόϧεςʔϒϧίΠϯʹطଘͷ໰୊ΛղܾͰ͖ΔՄೳੑ͕͋Δ͜ͱ͸͔֬ͩ
    ͕ɺॾʑͷϧʔϧ͕੔උͰ͖͍ͯͳ͍
    w ๏཯ɺن੍্ͷ՝୊͕ΫϦΞʹͳΒͳ͍͏ͪ͸ϓϩδΣΫτͷ։࢝͸ೝΊͳ͍
    w 'BDFCPPLɺ$BMJCSB
    w ϦεΫΛ๊͑ͨ··ϩʔϯν͢Δؾ͸ແ͍
    w -JCSBͷ։ൃΛߦ͍ͳ͕Βڠௐͯ͠ਐΊ͍͖͍ͯͨ աڈͷ'BDFCPPLͷݸਓ৘ใ΍ϑΣΠΫ
    χϡʔεͳͲͷ໰୊Λڍ͛ͯڧ͘൷൑͢Δ
    ਓͨͪ΋ɻ
    ͔ͦ͜Βઌͷٞ࿦͸ʁ

    View full-size slide

  24. ໨࣍
    w ൃදͷΰʔϧ
    w ֓ཁͱݱঢ়
    w ໨త
    w खஈ
    w ݱঢ়
    w ٕज़໘
    w ߹ҙΞϧΰϦζϜ
    w σʔλߏ଄
    w ͓ΘΓʹ

    View full-size slide

  25. ٕज़໘࿩͢͜ͱ࿩͞ͳ͍͜ͱ
    w ࿩͢͜ͱ߹ҙΞϧΰϦζϜɺσʔλߏ଄ ΞΧ΢ϯτ͚ͩ

    w ࿩͞ͳ͍͜ͱ.PWFݴޠ
    IUUQTEFWFMPQFSTMJCSBPSHEPDTBTTFUTQBQFSTUIFMJCSBCMPDLDIBJOQEG

    View full-size slide

  26. ߹ҙΞϧΰϦζϜ

    View full-size slide

  27. ߹ҙΞϧΰϦζϜԿΛ߹ҙ͍ͯ͠Δͷ͔
    w τϥϯβΫγϣϯͷॱ൪
    w τϥϯβΫγϣϯͷ݁Ռ
    w ˠ4UBUF.BDIJOF3FQMJDBUJPO 4.3

    IUUQTEFWFMPQFSTMJCSBPSHEPDTMJCSBQSPUPDPM
    -JCSB1SPUPDPM,FZ$PODFQUT5SBOTBDUJPOTBOE4UBUFT

    View full-size slide

  28. ߹ҙΞϧΰϦζϜ-JCSB#'5ͷݩʹͳ͍ͬͯΔΞϧΰϦζϜ
    IUUQTNFEJVNDPNDPJONPOLTQCGUVOEFSTUBOEJOHUIFBMHPSJUINCBBF
    IUUQTNFEJVNDPNPOUPMPHZOFUXPSLIPUTUV⒎UIFDPOTFOTVTQSPUPDPMCFIJOEGBDFCPPLTMJCSBCGUBC
    1#'5 )PU4UV⒎

    View full-size slide

  29. ߹ҙΞϧΰϦζϜ-JCSB#'5ͷมߋ఺
    w 4.3ͷܾఆੑ͕όάͬͯ΋େৎ෉ͳΑ͏ʹɺόϦσʔλ͸5Yͷॱ൪͚ͩͰͳ݁͘Ռʹ
    ΋ॺ໊͢Δʢ'BJMTBGFͷͨΊʁʣ
    HotStuff Extensions and Modifications
    IUUQTHJUIVCDPNMJCSBMJCSBUSFFNBTUFSDPOTFOTVTIPUTUV⒎FYUFOTJPOTBOENPEJpDBUJPOT
    ʢଞʹ΋มߋ఺͕͍͔ͭ͘ॻ͍ͯ͋Δ͚ͲɺΑ͘Θ͔Γ·ͤΜͰͨ͠…ʣ
    ͔ͨ͠ʹHotStuffͰ͸ɺ
    ʹॺ໊͍ͯ͠Δ
    ⟨type, viewNumber, node⟩
    LibraBFT > 4.2. Verification of Network Records
    IUUQTEFWFMPQFSTMJCSBPSHEPDTBTTFUTQBQFSTMJCSBDPOTFOTVTTUBUFNBDIJOFSFQMJDBUJPOJOUIFMJCSBCMPDLDIBJOQEG
    HotStuff > 4.2 Data Structure
    IUUQTBSYJWPSHQEGQEG
    (௥ه) ਵ࣌վળ͕ߦΘΕ͍ͯΔ໛༷
    ˠIUUQTEFWFMPQFSTMJCSBPSHCMPH

    View full-size slide

  30. ߹ҙΞϧΰϦζϜ5SBOTBDUJPOT1FS4FDPOE 514

    w ϖʔύʔͷઆ໌Ͱ͸ 514
    w ࢀߟ"MJQBZ͕8
    ʹ 514
    w શવ଍Γͳ͍ʁ IUUQTEFWFMPQFSTMJCSBPSHEPDTBTTFUTQBQFSTUIFMJCSBCMPDLDIBJOQEG
    1FSGPSNBODF
    8FBOUJDJQBUFUIBUNBOZQBZNFOUUSBOTBDUJPOTXJMMPDDVSP⒎DIBJO GPSFYBNQMF XJUIJO
    BDVTUPEJBMXBMMFUPSCZVTJOHQBZNFOUDIBOOFMT<>
    w αΠυνΣʔϯతͳ΋ͷΛ૝ఆ͍ͯ͠Δͱॻ͔Ε͍ͯΔ
    ࢀߟ
    ΠʔαϦΞϜεέʔϦϯάͷഎܠͱ֓ཁ
    IUUQTTQFBLFSEFDLDPNPTVLFJTBSJBNVTVLFSJOHVGBMTFCFJKJOHUPHBJZBP TMJEF
    ΦϑνΣʔϯͷٕज़Λ࢖͏͜ͱͰϝΠϯνΣʔϯͷঢ়ଶભҠΛ࠷খݶʹ͢Δ
    ˣ
    ϘτϧωοΫ͕߹ҙΞϧΰϦζϜ͔ΒΦϑνΣʔϯଆͷॲཧೳྗʹҠΔ
    ˣ
    ཧ࿦తʹ͸ݱࡏͱಉ౳ͷύϑΥʔϚϯε͕ग़Δ͸ͣ

    View full-size slide

  31. σʔλߏ଄4UPSBHFϞδϡʔϧ
    w -FEHFS*OGP 5SBOTBDUJPOT
    w &WFOUT "DDPVOU4UBUFT
    IUUQTEFWFMPQFSTMJCSBPSHEPDTDSBUFTTUPSBHF
    IUUQTEFWFMPQFSTMJCSBPSHEPDTMJCSBQSPUPDPM

    View full-size slide

  32. σʔλߏ଄+FMMZpTI.FSLMF5SFF
    w CJUͷ4QBSTF.FSLMF5SFF
    w *OUFSOBM/PEFͱ-FBG/PEFͰߏ੒
    IUUQTHJUIVCDPNMJCSBMJCSBCMPCNBTUFSTUPSBHFKFMMZpTINFSLMFTSDMJCST

    View full-size slide

  33. σʔλߏ଄+FMMZpTI.FSLMF5SFF
    w ࢀߟ4QBSTF.FSLMF5SFF
    IUUQTNFEJVNDPN!LFMWJOpDIUFSXIBUTBTQBSTFNFSLMFUSFFBDEBBFC
    lؚ·Ε͍ͯΔzূ໌ lؚ·Ε͍ͯͳ͍zূ໌

    View full-size slide

  34. σʔλߏ଄+FMMZpTI.FSLMF5SFF
    w *OUFSOBM/PEFͱ4QBSTF.FSLMF5SFF CJUͷ4QBSTF.FSLMF5SFF
    ˣ
    CJUͷ4QBSTF.FSLMF5SFF͕࠷େਂ͞·Ͱॏͳͬͯ
    CJUΞυϨεͷεςʔτΛදݱ͍ͯ͠Δ

    View full-size slide

  35. σʔλߏ଄+FMMZpTI.FSLMF5SFF
    w ϒϩάʹॻ͖·ͨ͠
    w ιʔείʔυΛ௥ͬͨΓɺ
    w &UIFSFVNͱͷൺֱΛ͍ͯ͠·͢
    IUUQTBDLJOUPTIHJUIVCJPCMPHKFMMZpTINFSLMFUSFF

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  36. ໨࣍
    w ൃදͷΰʔϧ
    w ֓ཁͱݱঢ়
    w ໨త
    w खஈ
    w ݱঢ়
    w ٕज़໘
    w ߹ҙΞϧΰϦζϜ
    w σʔλߏ଄
    w ͓ΘΓʹ

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  37. ͓ΘΓʹ
    w -JCSBͷݱঢ়ͱٕज़໘ʹ͍ͭͯͬ͘͟ΓΈ͖ͯ·ͨ͠
    w ͦ͏͍͏ײ͡ͳͷͶʂͱࢥͬͯ΋Β͑ͨΒΰʔϧୡ੒
    w -JCSB͸εϚʔτίϯτϥΫτͷ࣮ߦ͕Մೳ

    w &UIFSFVN΍&04ͷΑ͏ʹΞϓϦέʔγϣϯ։ൃ͕Մೳ

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  38. ͓ΘΓʹ
    w ιϑτ΢ΣΞ͕ੈքΛҿΈࠐΜͰ͍͘CZϚʔΫɾΞϯυϦʔηϯ
    w ΋͠-JCSB͕ίέͯ΋ɺผͷ-JCSBతͳ΋ͷ͕ීٴ͢ΔͷͰ͸ͳ͍͔ ຽؒɺࠃɺͦͷଞʁʣ
    w ιϑτ΢ΣΞͰͰ͖Δ͜ͱ͕ͲΜͲΜ޿͕͍ͬͯ͘͜ͷ࣌୅ʹιϑτ΢ΣΞͷϓϩͱ͠
    ͯੜ͖͍ͯΔͷ͸޾ӡͳ͜ͱ
    IUUQTXXXXTKDPNBSUJDMFT4#
    ೔ຊޠ༁IUUQTPSBSBJOCPXBQQTDPNTPGUXBSF
    #BOLJOHJTOFDFTTBSZ
    —#BOLTBSFOPU
    #JMM(BUFT

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  39. ͢΂ͯΦʔϓϯιʔε
    ΍͍͖ͬͯ·͠ΐ͏

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