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Proof of Stake Casper
Kazuki YAMAGUCHI
February 02, 2018
Technology
9
12k
Proof of Stake Casper
ブロックチェーン勉強会 #1 発表資料
Kazuki YAMAGUCHI
February 02, 2018
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Transcript
1SPPGPG4UBLF$BTQFS d&UIFSFVNະདྷͷίϯηϯαεΞϧΰϦζϜd ϒϩοΫνΣʔϯษڧձ ,B[VLJ:BNBHVDIJ !ZBNBSL[ (VOPTZ*OD
4PGUXBSF&OHJOFFS!(VOPTZ (SBEVBUFEGSPN4QSJOH 8FC"QQMJDBUJPO3BJMT %BQQT4PMJEJUZ 3FTFBSDI$SZQUP$VSSFODZ#MPDLDIBJO (JUIVC5XJUUFS!ZBNBSL[ ,B[VLJ:BNBHVDIJ!ZBNBSL[
(VOPTZ#MPDLDIBJO#MPHͬͯ·͢ʂ ʮIUUQCMPDLDIBJOHVOPTZJPʯPSʮάϊγʔϒϩοΫνΣʔϯʯ
"HFOEB w&UIFSFVNݱࡏͷεςʔλε w&UIFSFVNϝδϟʔΞοϓσʔτϑϩʔ w1SPPGPG4UBLF w&UIFSFVNͷ1P4$BTQFS wͭͷ$BTQFS w$BTQFS'SJFOEMZ'JOBMJUZ(BEHFU w·ͱΊ ˞ࠓճ$BTQFSͷ֓ཁͷհͷΈͰɺৄࡉͳٕज़༷ʹ৮Ε·ͤΜ ˞$BTQFSͷٕज़༷ݱࡏਐߦܥͰࡦఆதͰ͢ͷͰࠓޙมΘΔՄೳੑ͕͋Γ·͢
&UIFSFVNݱࡏͷεςʔλε ࣌
&UIFSFVNݱࡏͷεςʔλε ࡞ऀ 7JUBMJL#VUFSJO ެ։ γεςϜ 1SPPGPG8PSL ίϯηϯαεΞϧΰϦζϜ &UIBTI τʔΫϯൃߦ্ݶ
ͳ͠ ϒϩοΫੜใु &5) ϒϩοΫੜִؒ ฏۉඵ ϝδϟʔόʔδϣϯ .FUSPQPMJT #Z[BOUJVN ಛ 4NBSU$POUSBDUT
ࠓճ͜͜ͷ ࡞ऀ 7JUBMJL#VUFSJO ެ։ γεςϜ 1SPPGPG8PSL ίϯηϯαεΞϧΰϦζϜ &UIBTI τʔΫϯൃߦ্ݶ
ͳ͠ ϒϩοΫੜใु &5) ϒϩοΫੜִؒ ฏۉඵ ϝδϟʔόʔδϣϯ .FUSPQPMJT #Z[BOUJVN ಛ 4NBSU$POUSBDUT &UIFSFVNݱࡏͷεςʔλε
&UIFSFVNϝδϟʔΞοϓσʔτϑϩʔ
'SPOUJFS ະ։ )PNFTUFBE Ոෑ .FUSPQPMJT େࢢ 4FSFOJUZ ฏ੩ ࠓίί ϝδϟʔΞοϓσʔτ
ϋʔυϑΥʔΫ &UIFSFVNͷϝδϟʔΞοϓσʔτϑϩʔ ։ൃॳظ͔ΒେܕΞοϓσʔτΛ࣮ࢪ͠ɺਐԽΛଓ͚͍ͯΔ ʁ .FUSPQPMJTୈʮ#Z[BOUJVNʯ͕ྃ
'SPOUJFS ະ։ )PNFTUFBE Ոෑ .FUSPQPMJT େࢢ 4FSFOJUZ ฏ੩ ϝδϟʔΞοϓσʔτ ϋʔυϑΥʔΫ
&UIFSFVNͷϝδϟʔΞοϓσʔτϑϩʔ ʁ %BHHFS)BTIJNPUP &UIBTI &UIBTI $BTQFS 1SPPGPG8PSL 1SPPGPG4UBLF όʔδϣϯ͝ͱʹίϯηϯαεΞϧΰϦζϜมԽ͖͍ͯͯ͠Δ
'SPOUJFS ະ։ )PNFTUFBE Ոෑ .FUSPQPMJT େࢢ 4FSFOJUZ ฏ੩ ϝδϟʔΞοϓσʔτ ϋʔυϑΥʔΫ
&UIFSFVNͷϝδϟʔΞοϓσʔτϑϩʔ ʁ %BHHFS)BTIJNPUP &UIBTI &UIBTI $BTQFS 1SPPGPG8PSL 1SPPGPG4UBLF ࠓճ͜ͷίϯηϯαεΞϧΰϦζϜͷ
1SPPGPG4UBLF
w ΤωϧΪʔফඅ "4*$ϚγϯͷಋೖͳͲ εςʔΫྔʹԠͯ͡ϒϩοΫੜ͕֬มԽ͢ΔͷͰܭࢉྔΛ͑ΒΕΔ w ߈ܸ ϚΠχϯάϓʔϧͷ݁ୗ εςʔΫྔʹґଘ͢ΔܗʹͳΔͷͰɺશମͷͷεςʔΫΛ֬อ͢Δͷඇݱ࣮త
1SPPGPG4UBLF༁͢Δͱʮֻ͚ۚʹΑΔূ໌ʯ ίϯτϥΫτPSಛఆͷΞυϨεʹૹ৴͞ΕͨτʔΫϯྔʹԠͯ͡ϒϩοΫঝೝͷޭ͕֬มΘΔɻ ʮޭ͕֬มΘΔʯͷఆ༷ٛʑɻEJ⒏DVMUZUBSHFUͷ͕εςʔΫྔͰมԽ͢Δ߹ɺϒϩο Ϋੜݖ͕ϥϯμϜʹৼΓ͚ΒΕΔγεςϜͰɺੜݖΛಘΒΕΔ͕֬มԽ͢Δ߹ͳͲɻ 1P41P8๊͕͑ΔʮΤωϧΪʔফඅʯʮ߈ܸʯͳͲͷΛղܾ͢Δίϯηϯαε ΞϧΰϦζϜͱͯ͠ߟ͑ΒΕͨɻ ·ͨɺ&UIFSFVNͰτʔΫϯͷྲྀಈੑΛଛͳ͏Մೳੑͷ͋ΔDPJO"HFͷΈಋೖ͞Εͳ͍ɻ εςʔΫͨ͠τʔΫϯϲ݄ϩοΫ͞ΕΔ 7JUBMJLͷൃݴ 1SPPGPG4UBLF 1P8๊͕͑Δͱ1P4ʹΑΔղܾ
εςʔΫ૯ྔʹରͯࣗ͠ͷεςʔΫྔͷׂ߹͕ϑΥʔδϯάͷޭ֬ͱͳΔ ্هͷάϥϑͷ߹ɺ࠷ଟ͘ͷεςʔΫΛߦͳ͍ͬͯΔ%͞Μ͕࠷ߴ͍ޭ֬ 1P8Ͱܭࢉྔͷଟ͕֬͞ʹө͞ΕΔ͕ɺ1P4ͰεςʔΫྔͰܾ·Δ όϦσʔλʔ ͲͷΑ͏ʹͯ͠ϑΥʔδϯάͷޭ͕ܾ֬·Δͷ͔ʁ 4UBLF ҰఆྔͷτʔΫϯΛσϙδοτ " # $
% 1SPPGPG4UBLF
1SPPGPG4UBLF /PUIJOHBU4UBLFͱേతΞϧΰϦζϜ4MBTIFS 1P41P8ͱൺֱ͢Δͱ༏Ε͍ͯΔ͕͋Δ͕ɺ1P4ʹγεςϜతͳ͕ଘࡏ͢ ΔɻͦΕ͕ɺ/PUIJOHBU4UBLFɻ /PUIJOHBU4UBLFͱɺϦεΫΛഎෛΘͣʹ༰қʹϒϩοΫੜ͕ߦ͑ͯ͠·͏ ɻ1P4ͰҰఆͷεςʔΫྔ͕͋Ε༰қʹෆਖ਼ͳϒϩοΫΛ࡞Δ͜ͱ͕Ͱ͖Δ ঢ়گ͕࡞ΒΕ·͢ɻ͜ͷঢ়گΛར༻ͯ͠ෆਖ਼ͳϒϩοΫΛੜ͠ɺॏૹۚΛൃੜ ͤ͞Δ͜ͱ͕༰қʹͰ͖ΔΑ͏ʹͳͬͯ͠·͏ɻ ͜ͷ/PUIJOHBU4UBLFΛղܾ͢ΔͨΊʹɺ&UIFSFVNͷ1P4Ͱʮ4MBTIFSʯ ͱݺΕΔേతΞϧΰϦζϜ͕ಋೖ͞Ε·͢ɻ
ਖ਼֬ʹಋೖ͞ΕΔ༧ఆͰ͢ 4MBTIFSͱ1P4Ͱෆਖ਼ΛߦͬͨϢʔβʔͷεςʔΫΛऩ͢ΔΈͰɺ͜ͷേ తΞϧΰϦζϜͷಋೖʹΑΓɺෆਖ਼ͳϒϩοΫੜͳͲΛߦ͏ϦεΫΛେ͖͘͠·͢ɻ ͜ͷෆਖ਼Λߦ͏ϦεΫΛେ͖͘͢Δ͜ͱʹΑΓɺ/PUIJOHBU4UBLFΛղܾ͠·͢ɻ
&UIFSFVNͷ1P4$BTQFS
$BTQFSͷ༷ͭߟ͑ΒΕ͍ͯΔ $BTQFSࠒ͔Βߏ͕࢝·Γɺͭͷݚڀ࣮͕ߦΘΕ͍ͯΔɻ ͲͪΒιʔείʔυ͕(JU)VC্ʹެ։͞Ε͓ͯΓɺ ݱࡏ7JUBMJLߟҊͷ''(ܕͷ$BTQFS͕ςετωοτ্Ͱͷݕূ͕ਐΊΒΕ͍ͯΔɻ ''(શͳ$BTQFSͰͳ͘ɺ$BTQFSҠߦͷϓϩηεͰ༻͍Δ؆қ࣮ 'SJFOEMZ'JOBMJUZ(BEHFU ''( 1P8ͱ1P4ͷϋΠϒϦοτܕ $PSSFDUCZ$POTUSVDUJPO
$#$ 1P4ܕ
$BTQFSࠒ͔Βߏ͕࢝·Γɺͭͷݚڀ࣮͕ߦΘΕ͍ͯΔɻ ͲͪΒιʔείʔυ͕(JUIVC্ʹެ։͞Ε͓ͯΓɺ ݱࡏ7JUBMJLߟҊͷ''(ܕͷ$BTQFS͕ςετωοτ্Ͱͷݕূ͕ਐΊΒΕ͍ͯΔɻ ''(શͳ$BTQFSͰͳ͘ɺ$BTQFSҠߦͷϓϩηεͰ༻͍Δ؆қ࣮ $PSSFDUCZ$POTUSVDUJPO $#$ 1P4ܕ 'SJFOEMZ'JOBMJUZ(BEHFU ''(
1P8ͱ1P4ͷϋΠϒϦοτܕ $BTQFSͷ༷ͭߟ͑ΒΕ͍ͯΔ $BTQFSόʔδϣϯͰಋೖ͞ΕΔ༧ఆͷ࣮ͬͪ͜
$BTQFSͷҠߦଟஈ֊తʹߦΘΕΔ༧ఆ &UIBTI 1P8্ʹల։͢Δ1P4 1P8ͰϒϩοΫΛϚΠχϯάޙɺ 1P4ͰϑΝΠφϥΠζ 1P8ͱ1P4ͷϋΠϒϦοτӡ༻ ϚΠχϯάใुΛݮগ͠ɺ 7BMJEBUPSͷใुΛ૿͢ʣ $BTQFS 1P4
ݚڀ։ൃ͕ελʔτ͠ݕূ͕ਐΊΒΕ͍ͯΔ $BTQFSόʔδϣϯͰ1P4''(͕ಋೖ͞ΕΔ༧ఆ Ҏ߱ͷৄࡉͳٕज़༷ͳͲܾ·͍ͬͯͳ͍ $BTQFSҠߦͷϩʔυϚοϓ
ϒϩοΫ ϒϩοΫ ϒϩοΫ ''(1P8ͰϒϩοΫΛੜΛߦ͍ɺ1P4Λ༻͍ͯϝΠϯνΣʔϯΛܾఆ͢Δɻ 1P8 ͷ্ʹ1P4͕͔ͬͬͯಈ͘Πϝʔδ ϒϩοΫຖʹʮνΣοΫϙΠϯτʯͱݺΕΔ۠ΓΛઃఆɻ νΣοΫϙΠϯτ͝ͱʹ༗ޮͩͱࢥ͏νΣʔϯͷϒϩοΫΛόϦσʔλʔͷථʹΑ Γܾఆ͢Δɻ
ܾఆʹஈ֊ͷϥϯυΛ౿Έɺϥϯυ ϒϩοΫ Ͱਖ਼Խ KVTUJpFE ɻ ϥϯυ ϒϩοΫ Ͱ֬ఆ 'JOBMJ[F ͞ΕΔɻ $BTQFS''(1P8ͱ1P4ͷϋΠϒϦοτ $BTQFS'SJFOEMZ'JOBMJUZ(BEHFU 1P8ͷ্ʹ1P4͕͔ͬͯಈ͘Πϝʔδ 1SPPGPG8PSL 1SPPGPG4UBLF ˞''(8IJUF1BQFSͰհ͞ΕͨΈͳ ͷͰɺࠓޙมΘΔՄೳੑେ
''(1P8ͰϒϩοΫΛੜΛߦ͍ɺ#'54UZMF104Λ༻͍ͯϝΠϯνΣʔϯΛܾ ఆ͢Δɻ 1P8ͷ্ʹ1P4͕͔ͬͬͯಈ͘Πϝʔδ ϒϩοΫຖʹʮνΣοΫϙΠϯτʯͱݺΕΔ۠ΓΛઃఆɻ νΣοΫϙΠϯτ͝ͱʹ༗ޮͩͱࢥ͏νΣʔϯͷϒϩοΫΛόϦσʔλʔͷථʹΑ Γܾఆ͢Δɻ ܾఆʹஈ֊ͷϥϯυΛ౿Έɺϥϯυ ϒϩοΫ Ͱਖ਼Խ
KVTUJpFE ɻ ϥϯυ ϒϩοΫ Ͱ֬ఆ 'JOBMJ[F ͞ΕΔɻ ϒϩοΫ ϒϩοΫ ϒϩοΫ $BTQFS''(1P8ͱ1P4ͷϋΠϒϦοτ $BTQFS'SJFOEMZ'JOBMJUZ(BEHFU 1P8ͷ্ʹ1P4͕͔ͬͯಈ͘Πϝʔδ 1SPPGPG8PSL 1SPPGPG4UBLF pOBMJ[FEKVTUJpFE pOBMJ[FEKVTUJpFE
·ͱΊ ɾ&UIFSFVNେܕΞοϓσʔτΛ࣮ࢪ͠ɺਐԽΛଓ͚͍ͯΔ ɾ$BTQFSͷಋೖଟஈతʹߦΘΕ͍ͯ͘༧ఆͰɺݱࡏݚڀ։ൃ ͢͢ΊΒΕ͍ͯΔ ɾ$BTQFSҠߦͷୈҰஈ֊ͱͯ͠1P8ͱ1P4ͷֻ͚߹Θͤͨ ''(ͱݺΕΔΈ͕ಋೖ͞ΕΔ༧ఆ
ࢀߟࢿྉ w*OUSPEVDJOH$BTQFSlUIF'SJFOEMZ(IPTUz w6OEFSTUBOEJOH4FSFOJUZ 1BSU$BTQFS w$BTQFS'SJFOEMZ'JOBMJUZ(BEHFUXIJUFQBQFS w1SPPGPG4UBLF'2(JUIVC w$BTQFS7FSTJPO*NQMFNFOUBUJPO(VJEF
͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠