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sgtn
January 09, 2019
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PlasmaCash派生の解説
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sgtn
January 09, 2019
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Transcript
Plasma Off-chain Transaction Verification Protocol Cryptoeconomics Lab - Shogo Ochiai
Ethereumͷࢿ࢈อશੑͷ·· ॲཧΛ҆શʹΦϑϩʔυ͢Δٕज़ ΤάθΫςΟϒαϚϦ
ΤάθΫςΟϒαϚϦ2 ళฮͰTx͕2ඵͰ֬ఆͰ͖Δ ҰํͰݸਓؒૹۚͷfinalityΛՄมʹ ΤϯυϢʔβʔΨεෆཁ ΤεΫϩʔίϯτϥΫτՄ ·ͣҡ࣋අ~1000ສԁ/ ҡ࣋අνϡʔχϯάͰ҆͘ͳΔॲ͋Γ
Έʹ͍ͭͯ
H H H H H H H H H H
H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H H Sparse Merkle Tree (ૄϚʔΫϧ) Bob 1000JPY ૹΓ·͢ Alice ϒϩοΫ
Bob 1000JPY ૹΓ·͢ Alice Merkle RootETHʹอଘ ࢠνΣʔϯͷຖϒϩοΫੜ࣌ ProofΥϨοτʹอଘ TxBytesΥϨοτʹอଘ
Bob 1000GYENૹΓ·͢ Alice Merkle Root32bytes TransactionѹॖޮՌ ߴ͞5ͷπϦʔProof͕5ͭ 1Tx 100bytes~͘Β͍ͷαΠζ
࣌ؒ blocktime 1 શͯͷϒϩοΫͷProofΛ͓࣋ͬͯ͘͜ͱͰɺ ࢠνΣʔϯTransactionͷଘࡏূ໌͕Ͱ͖Δ
TransactionͷѼઌ͕ͻͱͭ औҾཤྺ͕Ұઢ JPY
͋Δ༬ۚΠϕϯτ͔ΒḷͬͯɺऔҾཤྺ͕Ұઢ Alice Bob Carl David
Davidͷ͓ۚΛӡӦ͚ͩվ͟ΜͰ͖Δ͕ ѱ͍͜ͱΛ͠Α͏ͱͯ͠ɾɾɾ Alice Bob Operator David ଞਓͷ͓ۚͰ Exit 1weekͪ
OperatorɺDavidʹ͓͕ۚΔTxͷ ଘࡏূ໌ʹ߹ҙ͍ͯ͠ΔͷͰ Alice Bob Operator David Exit Carl David Challenge
(ҟٞਃཱͯ)
͠ଘࡏূ໌ʹΦϖϨʔλʔ͕߹ҙ͍ͯ͠ͳ͔ͬͨΒʁ Alice Bob Carl David Carl: “ૹ͕ۚಧ͔ͳ͍ʂ” Carl: “ࢿ࢈ΛकΔͨΊʹExit͢Δʂ” Operator:
“CarlͷUTXOΛ༻͢ΔUTXOͳ͍͠ɺཤྺਖ਼ ͍͔͠ΒɺWithdraw͍͍ͯ͠Α” Txੜ Txੜ Txੜ Commit Commit Conf Conf Exit Conf Conf Conf Conf David: “Carlૹ͍ۚͨͬͯ͠͏͚ ͲɺConfͱΕͳ͍͔Β ͤͳ͍ͳ͋”
Only one honest user ݪଇ ࣗҎ֎ΈΜͳάϧ
ཤྺʹΑΔෆਖ਼ূ໌ (શෆਖ਼औҾҟٞਃཱͯՄ) ଘࡏূ໌ (Merkle Proof) Proof of Silence (ʮੋͳΓʯݪଇ) Ethereumͱಉ͡ηΩϡϦςΟΛͨΒ͢
ઈົͳτϨʔυΦϯؔ
Proof of Silence (ʮੋͳΓʯݪଇ) ݟ׳Εͳ͍୯ޠ͕ɾɾɾ Exit͕Withdraw͞ΕΔʹʮ͠ෆਖ਼ʹExit͞ΕΑ͏ͱ͠ ͍ͯΔߴͷ࣋ͪओ͕͍ΔͳΒɺͦΕʹؾ͚ͮΔ͚ͩͷ ेͳ࣌ؒΛͭʯͱ͍͏͕݅͋Δɻ͜Ε҉ʹ ʮͦͷࣄલऔΓܾΊͷ্Ͱෆຬ͕ͳ͍ͳΒɺͦͷ Withdrawalਖ਼ͳͷͩΖ͏ʯͱ͍͏ϧʔϧ͕͋Δɻ͜
ΕΛ “Proof of Silence” ͱ໋໊͓ͯ͘͠ͱɺཧղ͢͠ ͍ɻ͋͘·Ͱɺ୭͔͕໌ࣔతʹঝೝ͠ͳ͍ઃܭͰҾ͖ग़ ͠Λݕূ͍͔ͨ͠Β͜ͷΑ͏ͳઃܭʹͳ͍ͬͯΔɻ
ࢿ࢈อશੑ100% ҆ఆՄಈੑ99.999999% ֶతอূ ֶతվળ ཉுΒͳ͍͠దʹࡁ·ͤͳ͍όϥϯε
ࢿ࢈อશੑ100% ҆ఆՄಈੑ99.999999% ֶతอূ 0.000001%͕ى͖ͨ ͜Μͳͱ͖Ͳ͏͢Δʁ
ނো͔ѱҙ͔αʔόʔఀࢭ ͰτϥετϨεͳͷͰ PlasmaࢠνΣʔϯ αʔόʔ PlasmaνΣʔϯ ίϯτϥΫτ 0.000001% 1. ͓͕ۚಈ͔ͤͳ͍… 2.
ग़
ߴͰ͍͍͚͢Ͳ Ethereumͱಉ҆͡৺ ͜Ε͕Plasma