Speaker Deck
Speaker Deck Pro
Sign in
Sign up
for free
ERC-721をかぞえて / Enumerate ERC-721
Ryo Manzoku
August 27, 2019
Programming
2
2.2k
ERC-721をかぞえて / Enumerate ERC-721
Road To Devcon 3.0
https://ethereumjapan.connpass.com/event/142897/
Ryo Manzoku
August 27, 2019
Tweet
Share
More Decks by Ryo Manzoku
See All by Ryo Manzoku
rmanzoku
0
220
rmanzoku
6
2k
rmanzoku
0
120
rmanzoku
1
2k
rmanzoku
1
3.8k
rmanzoku
3
1.8k
rmanzoku
4
330
rmanzoku
0
410
rmanzoku
6
1.4k
Other Decks in Programming
See All in Programming
siketyan
1
110
malvinstn
1
610
shigeruoda
0
460
line_developers_tw2
0
530
sullis
0
110
loleg
0
190
nrslib
20
13k
taoshotaro
1
360
osyo
1
360
e10dokup
0
430
freekmurze
0
190
yshrsmz
1
440
Featured
See All Featured
stephaniewalter
260
11k
brad_frost
156
6.4k
swwweet
206
6.8k
garrettdimon
287
110k
dougneiner
55
5.4k
kneath
219
15k
62gerente
587
200k
smashingmag
283
47k
carmenhchung
26
1.3k
colly
66
3k
keavy
106
14k
jakevdp
774
200k
Transcript
ERC-721Λ͔ͧ͑ͯ 2019-08-27 Road to Devcon 3.0 double jump.tokyoגࣜձࣾ ϦʔυΤϯδχΞ ຬ
྄
• Re-building the future of gaming with blockchain technology !!
• 20184݄ ۀ • ϒϩοΫνΣʔϯήʔϜઐۀ։ൃձࣾ • ैۀһ17ਓʢۀҕୗΛؚΉʣ • ϒϩοΫνΣʔϯʹҙͷ͋ΔΤϯδχΞΛੵۃ࠾༻தͰ͢ʂ double jump.tokyoגࣜձࣾ
• ຬ ྄ ʢManzoku Ryoʣ • double jump.tokyo ϦʔυΤϯδχΞ •
20187݄ΑΓ Πϯϑϥઃܭӡ༻ɺαʔόαΠυ։ൃɺ SmartContract։ൃɺϒϩοΫνΣʔϯٕज़ௐࠪͳͲΛ୲ • աڈʹιʔγϟϧήʔϜձࣾɺEdTechΞϓϦձࣾͰΠϯϑϥ ΤϯδχΞͱͯ͠AWSΛத৺ͱͨ͠ΫϥυΠϯϑϥ͔ΒΞϓ Ϧ·ͰͷશମઃܭɺߏஙɺվળΛܦݧ ࣗݾհ
None
• ຬ ྄ ʢManzoku Ryoʣ • double jump.tokyo ϦʔυΤϯδχΞ •
20187݄ΑΓ Πϯϑϥઃܭӡ༻ɺαʔόαΠυ։ൃɺ SmartContract։ൃɺϒϩοΫνΣʔϯٕज़ௐࠪͳͲΛ୲ • աڈʹιʔγϟϧήʔϜձࣾɺEdTechΞϓϦձࣾͰΠϯϑϥ ΤϯδχΞͱͯ͠AWSΛத৺ͱͨ͠ΫϥυΠϯϑϥ͔ΒΞϓ Ϧ·ͰͷશମઃܭɺߏஙɺվળΛܦݧ ࣗݾհ σβΠϯͷܦݧͳ͍ͷͰ SolidityͱWebύϑΥʔϚϯεͷΛ͠·͢ʂ
• Ϣʔβʔମݧͱ͍͏ҙຯͰɺࠓʹ͓͍ͯ ΦϯνΣʔϯͰαʔϏεશͯΛ࣮͢ΔͷෆՄೳ • Ethereum X.X ʹظʂ • “Read world”ʹαʔϏεΛఏڙ͢ΔͨΊʹɺΦϑνΣʔϯͱ
ͷΈ߹Θ͕ͤඞਢ • ʮERC-721τʔΫϯΛ͑Δʯͱ͍͏ྫͰ՝Λհ • WebύϑΥʔϚϯεͷ؍͔ΒUX՝Λײͯ͡Β͑Ε MyCryptoHeroesͷܦݧ͔Β͓Ͱ͖Δ͜ͱ
ࠓԕྀ͠ͳ͍͍ͯ͘ͱฉ͍ͯ·͢
• ͍ͬͯͳ͍ • 1͔ͭΒ9͍ͭ࣋ͬͯΔ • 10Ҏ্͍࣋ͬͯΔ • 2Ҏ্ͷίϯτϥΫτͷτʔΫϯΛ͍࣋ͬͯΔ • 10Ҏ্ͷίϯτϥΫτͷτʔΫϯΛ͍࣋ͬͯΔ
• ͕ࣗσϓϩΠͨ͠ίϯτϥΫτͷτʔΫϯΛ100ΞυϨεҎ্ ͕ॴ༗͍ͯ͠Δ ERC-721ͷτʔΫϯ࣋ͬͯ·͔͢ʁ
• ΥϨοτͱʁ • Metamask on Chrome • tokenPocket / GO
Wallet ଞϞόΠϧܥ • Opera • HTC Exodus / FINNY • Dapper • ࣗ࡞ ΥϨοτͳʹΛ͍ͬͯ·͔͢ʁ
• Βͳ͍ • ΥϨοτಠࣗϊʔυ • Infura.io • CloudFlare • ࣗલϊʔυ
͓͍ͷΥϨοτ͕ଓ͍ͯ͠Δϊʔυʁ
• MyCryptoHeroesͷհ • ERC-721ͱERC-721 Enumerableʹ͍ͭͯ • ERC-721 Enumerableͷ࣮ࡍͱ՝Λ௨ͯ͠”Real world”ͷϒ ϩοΫνΣʔϯαʔϏεΛߟ͑Δ
• MCH+ͷհ ͓ॻ͖
ʹ͍ͭͯ
https://mch.gg/start
• ήʔϜʹ͔͚͓ͨ࣌ؒۚɺ͋ͳͨͷࢿ࢈ͱͳΔੈք • ྺ্࢙ͷώʔϩʔΛूΊɺΞΠςϜΛ֫ಘ͠ɺότϧ͢Δ ϒϩοΫνΣʔϯRPGήʔϜ • ϒϩοΫνΣʔϯEthereum͓ΑͼࢄετϨʔδIPFSΛར༻ • Ethereum্ͰͷDailyActiveUserɾNFTऔҾྔ/औҾͰੈք1Ґ MyCryptoHeroesʢϚΠΫϦʣͱ
ήʔϜը໘
MyCryptoHeroesͷߏཁૉ &UIFSFVN 6TFS ϢʔβʔECDSAॺ໊༻ͷൿີ伴ͱ ରʹͳΔΞυϨεΛॴ༗ ήʔϜࢿ࢈ɺEthereum্Λਖ਼ͱͯ͠ཧ ॴ༗ใɺϢʔβʔͷΞυϨεʹ͋Δ ॴ༗ใΛ֬ೝ ήʔϜࢿ࢈Λ༻͍ͯήʔϜͰ༡Ϳ ࢿ࢈ΛҭͯΔ
MyCryotoHeroesͰ ɾήʔϜࢿ࢈Λͬͨ༡ͼͷఏڙ ɾETHʹΑΓήʔϜ௨՟Λൢച ɾ৽͍͠ήʔϜࢿ࢈ͷ༩ɺൢച ɾήʔϜࢿ࢈ΞʔτΛ༩
• ϒϩοΫνΣʔϯͷ՝Ͱ͋ΔεέʔϥϏϦςΟͱUXͷղܾ ͷͨΊήʔϜͱͯ͠ͷػೳΦϑνΣʔϯͰߏங • σδλϧΞηοτʹNFTʢERC-721ʣΛ࠾༻ • ήʔϜ௨՟ߪೖ෦ͱNFTؔ࿈ͷΈΦϯνΣʔϯ • NFTͷΞΠίϯ࡞ͬͨͷͰͬͯͶʂγʔϧ͋ΔΑʂ MyCryptoHeroesͷΞʔΩςΫνϟ
• 2018/9/21-10/1 ώʔϩʔϓϨηʔϧͷ࣮ࢪ • 2018/9/25-11/2 ότϧβͷ࣮ࢪ • Loom NetworkΛར༻ͨ͠ΦϯνΣʔϯότϧγεςϜ •
2018/10/23 gRPC-WebͷGAΛड͚࣮ͯͷมߋ • 2018/11/30 ຊϦϦʔε MyCryptoHeroesϦϦʔε·Ͱͷมભ
• EVMΛࡌͨ͠αΠυνΣʔϯٕज़Ͱ͋ΔLoom NetworkΛ࠾༻ • ΦϯνΣʔϯٕज़Λ༻͍ͳ͕Β࣮ߦແྉ&ߴ࣮ߦΛ࣮ݱ • ϒϩοΫνΣʔϯͰՁΛ୲อ͠ͳ͕ΒήʔϜͱͯ͠ͷUXΛ֬ อͰ͖ͨɺɺͣ ότϧβ։࢝ͷߏ &UIFSFVN
6TFS
• ϩδοΫͱͯ͠ΦϯνΣʔϯʢSolidityʣʹΑΔ࣮ߦՄೳ • ͨͩ͠ɺॏ͗͢Δ • 1ότϧʹ͖ͭ10ඵఔ͔͔Γɺͦͷؒશͯͷॻ͖ࠐΈ͕ϒ ϩοΫ͞ΕΔࣄଶ • ͞Βʹৄ͍͠ઓ͍ҎԼͷεϥΠυʹͯ •
https://mch.gg/hicon2018 • https://speakerdeck.com/rmanzoku/blockchain-game-in-practice ότϧβͷ݁Ռ
MyCryptoHeroesͷߏཁૉ &UIFSFVN 6TFS ϢʔβʔECDSAॺ໊༻ͷൿີ伴ͱ ରʹͳΔΞυϨεΛॴ༗ ήʔϜࢿ࢈ɺEthereum্Λਖ਼ͱͯ͠ཧ ॴ༗ใɺϢʔβʔͷΞυϨεʹ͋Δ ॴ༗ใΛ֬ೝ ήʔϜࢿ࢈Λ༻͍ͯήʔϜͰ༡Ϳ ࢿ࢈ΛҭͯΔ
MyCryotoHeroesͰ ɾήʔϜࢿ࢈Λͬͨ༡ͼͷఏڙ ɾETHʹΑΓήʔϜ௨՟Λൢച ɾ৽͍͠ήʔϜࢿ࢈ͷ༩ɺൢച ɾήʔϜࢿ࢈ΞʔτΛ༩
ERC-721ʹ͍ͭͯ
• EthereumͰNFTΛ࣮ݱ͢Δݱ࣮తͳඪ४༷ • ʮॴ༗ใʯʮৡʯʮৡݖͷҠৡʯΛنఆͨ͠Πϯλʔ ϑΣʔεΛ࣮͢Δඞཁ͕͋Δ • ඪ४༷Ͱ͋ΔͨΊɺERC-721Λ࠾༻ͨ͠ήʔϜɺαʔϏεɺ औҾॴͰՃ։ൃແ͠Ͱར༻Ͱ͖ΔΑ͏ʹͳΔ • ERC-721Λ࣮ͨ͠
= NFT ͱͳΔΘ͚Ͱͳ͍͜ͱΛҙ ERC-721ͱ
ERC-721 Interfaces pragma solidity ^0.4.20; interface IERC721 /* is IERC165
*/ { event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId); event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId); event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved); function balanceOf(address _owner) external view returns (uint256); function ownerOf(uint256 _tokenId) external view returns (address); function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) external payable; function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable; function transferFrom(address _from, address _to, uint256 _tokenId) external payable; function approve(address _approved, uint256 _tokenId) external payable; function setApprovalForAll(address _operator, bool _approved) external; function getApproved(uint256 _tokenId) external view returns (address); function isApprovedForAll(address _owner, address _operator) external view returns (bool); }
• ownerOfؔʹΑΓ͋ΔτʔΫϯIDͷॴ༗ऀ͕Θ͔Δ • balaceOfؔʹΑΓ͋ΔΞΧϯτͷ૯ॴ༗͕Θ͔Δ • τʔΫϯͷॴ༗ऀଞऀʹτʔΫϯΛৡͰ͖Δ • approveʹׂ͍ͭͯѪ • ͋ΔΞΧϯτͷॴ༗τʔΫϯIDҰཡऔಘͰ͖ͳ͍
ERC-721ͷͰ͖Δ͜ͱͰ͖ͳ͍͜ͱ
ࣗͷ࣋ͬͯΔΞηοτฒ͍ͨͰ͢ΑͶ
ERC-721 Enumerable
ERC-721 Enumerable Interface interface ERC721Enumerable is ERC721 { function totalSupply()
external view returns (uint256); function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256 tokenId); function tokenByIndex(uint256 index) external view returns (uint256); }
• ྻڍΛՄೳʹ͢ΔΦϓγϣϯ֦ு Enumerable • ownerͱindex͔ΒτʔΫϯIDΛऔಘͰ͖ΔtokenOfOwnerByIndexؔ ͕͋Δ • balanceOfͰͱ͚ͬͨͩtokenOfOwnerByIndexΛͿΜճͤΑ͍ɻ • ಡΈऔΓࢹ
• ҰཡΛऔಘͰ͖ΔΑ͏ʹͱStorageใΛอଘ • ॻ͖ࠐΈࢹ ERC-721 Enumerable
• to infura.io ྻ100ݸ • 60ඵ͘Β͍͔͔Δ • infra.ioΞϝϦΧʹαʔόʔ͕͋ΔͷͰɺຊ͔Βͩͱݫ͍͠ ͿΜ·Θͯ͠Έ·͠ΐ͏
• infuraͷϊʔυɺւ֎ʹ͋ΔͨΊϨΠςϯγ͕େ͖͍ • ͍ΘΏΔʮޫ͍ʯ • await͍ͯ͠Δ͔ΒͰʁ • ͦ͏Ͱ͢Ͷɻ ͕ɺຊͦ͜Ͱͳ͘100ݸϦΫΤετΛൃߦ͢Δ͜ͱ •
UXతͳͩͱͪΖΜฒྻԽ͖͢ • ͔͠͠HTTP1.1ͷϒϥβ6ຊఔ͔͠ฒྻԽͰ͖ͳ͍ ͠100ݸͷτʔΫϯΛ͍࣋ͬͯΔਓͩͬͨΒ
• ࠃʹ͋ΔϊʔυαʔϏε • ͘ͳͬͨʂ • ͨͩ͠ɺϢʔβʔ͕࣋ͭΥϨοτͷϊʔυΛαʔϏεఏڙऀ ͕ࢦఆͰ͖·͔͢ʁ • ίϯτϩʔϧෆՄೳͳྖҬͰͷղܾࡦແҙຯ ࠃʹϊʔυ͕͋ΕΑ͘ͳ͍ʁ
ࣗͷ࣋ͬͯΔΞηοτฒΔ͚ͩͰࠔ
• WebͷύϑΥʔϚϯεվળʹ͓͍ͯɺࣗͨͪͷίϯτϩʔϧ ՄೳͳൣғͰྗΛ͖͢ɺࣗͨͪͷίϯτϩʔϧՄೳͳൣ ғΛ૿͖͢ • Walletɺ伴ཧͷ؍͔ΒݴͬͯෆՄ৵Ͱ͋Δํ͕ྑ͍ • ૉʹಡΉͷͰͳ͘ɺϓϩΩγΩϟογϡΛಋೖ͖͢ • ͦͦϒϩοΫνΣʔϯͷʮঢ়ଶʯΩϟογϡͱ૬ੑ͕ྑ
͍ ಡΈऔΓύϑΥʔϚϯεʹ͍ͭͯ
• transferͷλΠϛϯάͰɺॴ༗ҰཡΛཧ͍ͯ͠Δ • https://github.com/OpenZeppelin/openzeppelin-contracts/ commit/d1158ea68c597075a5aec4a77a9c16f061beffd3 • Storageͷߋ৽ͳͷͰͪΖΜGas͕͔͔Γ·͢ɻ ERC-721 Enumerableͷ࣮ //
Mapping from owner to list of owned token IDs mapping(address => uint256[]) private _ownedTokens; // Mapping from token ID to index of the owner tokens list mapping(uint256 => uint256) private _ownedTokensIndex;
Gasൺֱද ERC-721 ERC-721 Enumerable ྻڍ ☓ ˚ mint Gas 66,878
158,461 transferFrom Gas 44,742 72,236 https://ropsten.etherscan.io/address/0x78b315eff64c865ad1d903cd771eb85f9bb2558c https://ropsten.etherscan.io/address/0x78b315eff64c865ad1d903cd771eb85f9bb2558c https://ropsten.etherscan.io/address/0xe18e82118b1a277d90beefe7ffd7421b606d0f83
• ίϯτϥΫτ্ͰྻڍΛ͏߹ඞਢ • transferFromΛ·ͱΊ࣮ͯߦ͢Δ • 20ݸ͘Β͍·Ͱߦ͚Δ • ID͝ͱʹuint256ΛׂΓͯͯͳʹ͔Λཧ͢Δ • 150ݸ͘Β͍·Ͱ͍͚Δ
• ͦͦuint256ͬͯͲ͏ࢥ͍·͔͢ Enumerable͑ͳ͍ͷʁ
• ࣗΛؚΉSmartContract͔ΒݺΕ͏ΔཁૉͷΈΛStorageʹ อଘ͖͢ • Smart Contract֎͔ΒݺΕ͏ΔͷEventͱ࣮͖ͯ͢͠ • ΦϑνΣʔϯαΠυνΣʔϯ • ERC-721ʹݶΒͣͦ͏͍͏ઃܭํΛݟ͔͚Δ
• ༨ܭͳཁૉɺকདྷʹΓϢʔβʔ༨ܭͳGasͷෛ୲Λڧ͍Δ ͜ͱʹͳΔ → ϢʔβʔମݧͷѱӨڹ SmartContractͷઃܭํ
• ϒϩοΫνΣʔϯ্Ͱͯ͢ͷॲཧ͢Δͷ͍͠ • WebύϑΥʔϚϯεͷGasͷ؍͔ΒϢʔβʔମݧͱ ͯ͠ݫ͍͠ͱݴΘ͟Δ͓͑ͳ͍ • ༷Λࣄલʹߟ͑ͯɺඞཁͳΒΦϑνΣʔϯͱซ༻͢Δ • ຊʹίϯτϥΫτͰྻڍ͢Δඞཁ͋Δͷ͔ʁ •
ͦΕΛೖΕΔ͜ͱʹΑͬͯશͯͷϢʔβʔ͕GasΛෛ୲͢Δ ͜ͱΛ಄ʹೖΕ͓ͯ͘ ERC-721 EnumerableΛ௨ͯ͡
• ERC-721Ͱ͔ͤͬ͘ن͕ܾ֨·͍ͬͯΔͷ͔ͩΒ͍͍ײ͡ʹͰ ͖ͳ͍ͷɺɺʁ • ϒϩοΫνΣʔϯͰσδλϧΞηοτཧ͍͚ͨͩ͠ͳΜ͚ͩ Ͳɺɺɺ • ϒϩοΫνΣʔϯήʔϜͬͯͳΜ͔ͩϒϧʔΦʔγϟϯΒ͍͠ ͡Όͳ͍ʁ ͱ͜ΖͰɺɺ
ʹ͍ͭͯ
• ʮήʔϜʹ͔͚͓ͨ࣌ؒۚɺ͋ͳͨͷࢿ࢈ͱͳΔੈ քʯͷ֦େΛࢦͯ͠ • NFT͕ήʔϜͱήʔϜΛඈͼӽ͑Δੈք؍ͷ࣮ݱʹΉ͚ͯ • MyCryptoHeroesͷϊϋΛϑϨʔϜϫʔΫͱͯ͠ఏڙ͢Δϒ ϩοΫνΣʔϯήʔϜ։ൃࢧԉϓϩάϥϜ • ϒϩοΫνΣʔϯήʔϜࢢͷࢀೖোนΛԼ͛Δ
MCH+ͱ
• ͪΖΜྻڍػೳఏڙ • ERC-721 Metadataػೳ • Approvalؔ࿈ • ͦͷଞӶҙ։ൃதʂ ERC-721ʹ·ͭΘΔAPIΛఏڙ༧ఆ
ERC-721 Interfaces pragma solidity ^0.4.20; interface IERC721 /* is IERC165
*/ { event Transfer(address indexed _from, address indexed _to, uint256 indexed _tokenId); event Approval(address indexed _owner, address indexed _approved, uint256 indexed _tokenId); event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved); function balanceOf(address _owner) external view returns (uint256); function ownerOf(uint256 _tokenId) external view returns (address); function safeTransferFrom(address _from, address _to, uint256 _tokenId, bytes data) external payable; function safeTransferFrom(address _from, address _to, uint256 _tokenId) external payable; function transferFrom(address _from, address _to, uint256 _tokenId) external payable; function approve(address _approved, uint256 _tokenId) external payable; function setApprovalForAll(address _operator, bool _approved) external; function getApproved(uint256 _tokenId) external view returns (address); function isApprovedForAll(address _owner, address _operator) external view returns (bool); }
• ERC-721ʹ͓͍ͯɺtransferΠϕϯτඞਢ • ੜ·Ε͔ͯΒશͯͷtransferΛ͑ɺݱࡏͷঢ়ଶ໌͢Δ ΦϑνΣʔϯͰؤுΔྻڍ $ curl -s https://beta-api.mch.plus/inventory/ethereum/mainnet/ 0xd868711BD9a2C6F1548F5f4737f71DA67d821090/0xdceaf1652a131F32a821468Dc03A
92df0edd86Ea { "token_ids": [ 10021522, 10220372, 20270673, 20270688 ] }
ൺֱද ERC-721 ERC-721 Enumerable MCH+ ERC-721 ྻڍ ☓ ˚ ̋
mint Gas 66,878 158,461 66,871 transfer Gas 44,742 72,236 44,742
RE-BUILDING THE FUTURE OF GAMING WITH BLOCKCHAIN TECHNOLOGY !!