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公共とブロックチェーン / Public and Blockchain
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Kenji Saito
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December 07, 2020
Technology
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公共とブロックチェーン / Public and Blockchain
2020年12月7日(月)、オンラインサロン Beyond Blockchain 第4回「公共とブロックチェーン」にて使用したスライドです。
Kenji Saito
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December 07, 2020
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Transcript
4 Chief Science Officer /
[email protected]
— Beyond Blockchain —
2020-12-07 – p.1/13
https://speakerdeck.com/ks91 — Beyond Blockchain — 2020-12-07 – p.2/13
( ) SFC ( ) CSO (Chief Science Officer) 1993
( ) 2006 ( ) SFC 20 P2P (Peer-to-Peer) ( 9 ) 2011 2018 2019 2019 2020 2020 → ( ) — Beyond Blockchain — 2020-12-07 – p.3/13
(12/8) — Beyond Blockchain — 2020-12-07 – p.4/13
. . . 2009 ↑ 11 . . . —
Beyond Blockchain — 2020-12-07 – p.5/13
BBc-1/Ethereum API/ https://github.com/beyond-blockchain/examples/tree/master/certify-web 1. ID ( ) 2. ID ID
. . . ID ( ) — Beyond Blockchain — 2020-12-07 – p.6/13
ID { "id": "4445 4558 1689", "name": "Wednesday Addams", "born":
"1980-02-12", "address": "0001 Cemetery Lane", "public-key": "04d49e0786a37efce8552d6fd1566d7cfd86f110d4d95f1...4edb", "algo": "ecdsa-p256v1", "sig": "609b390f9486110d1ba39fc59cc46f1c2aa31ae8e40d3454c05a42...48e2", "pubkey": "0479c6676de61b41b7d0291b338f3279671d649f0a71bbb495...4bd1", } (Merkle) Ethereum — Beyond Blockchain — 2020-12-07 – p.7/13
*%Χʔυจॻ JEJE OBNF8FEOFTEBZ"EEBNTOBNF 8FEOFTEBZ"EEBNT ͷͷ ࣏ࣗମͷͷ CPSOCPSO BEESFTT$FNFUFSZ-BOFBEESFTT QVCMJDLFZEFDFECQVCMJDLFZ *%
Χʔυจॻ ͷμΠδΣετ ॺ໊͖ *% Χʔυจॻ ͷμΠδΣετ ࿈͔݁ͯ͠Β ܭࢉ͢Δ ॺ໊Λݕূ͠ɺ ޭͨ͠Β ࿈͔݁ͯ͠Β ܭࢉ͢Δ EJHFTU EJHFTU EJHFTU BMHPSJUIN TJHOBUVSF QVCMJDLFZ EJHFTU EJHFTU EJHFTU EJHFTU +40/ σʔλߏɺ෦ॲཧͰ 9.- ʹม͞Ε·͢ ͱͱ 9.- ༻ʹ࡞ͬͯ͋ΔϥΠϒϥϦΛ༻͍ͯ͠·͢ ɻ ෦తʹӅ͞Ε͍ͯͯূ໌Ͱ͖ΔΑ͏ʹɺηΫγϣϯ͝ͱʹμΠδΣετΛܭࢉ͍ͯ͠·͢ɻ ྫ͑ɺ*% ΧʔυͰྸॅॴɺ͋Δ͍ެ։伴Λ֬ೝ͢Δ͚ͩͰ͋Εɺ*% ൪߸ΛݟΔ͜ͱ͕๏Ͱېࢭ͞Ε͍ͯΔͷ߹ɺ *% ൪߸ΛӅͯ͠ ͦͷ෦ΛରԠ͢ΔμΠδΣετͰஔ͖͑ͯ ఏࣔͯ͠࠷ऴతʹॺ໊͖ *% Χʔυจॻͷಉ͡μΠδΣετΛܭࢉͰ͖ΔͷͰɺଘࡏূ໌͕Ͱ͖·͢ɻ ʮμΠδΣετʯͱɺ҉߸ֶతϋογϡؔʢࠓճ 4)"ʣʹΑͬͯܭࢉ͞Εͨͷ͜ͱͰ͢ɻ Θ͔ͣ ϏοτͰݩͷσʔλ͕ҟͳΔͱɺฦͬͯ͘Δ͕શ͘ҟͳΓɺμΠδΣετ͔ΒݩͷσʔλΛ ਪଌ͢Δ͜ͱͰ͖·ͤΜɻ — Beyond Blockchain — 2020-12-07 – p.8/13
API/ Merkle Proof จ ॻ จ ॻ จ
ॻ จ ॻ จ ॻ O μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ حͷ߹ ෳ͢Δ ɾจॻ Λಘͨ" ࢯɺಉ࣌ʹূ໌ཁૉͱͯ͠ɺϒϧʔͰࣔ͞ΕΔμΠδΣετͱ֤ʑ͕ࠨӈͷͲͪΒʹҐஔ͢Δ͔Λड͚औΔɻ ɾ" ࢯจॻ ͷμΠδΣετ͔Β࢝Ίͯɺ࿈͖݁͢Ұ࿈ͷμΠδΣετΛΔ͜ͱʹͳΔͷͰɺϚʔΫϧϧʔτʹࢸΔ·Ͱͷ ɹܭࢉΛ࠶ݱͰ͖ɺಘΒΕͨϚʔΫϧϧʔτ͕ &UIFSFVN εϚʔτίϯτϥΫτʹه͞Ε͍ͯΔͱҰக͢Δ͜ͱΛ֬ೝͰ͖Δɻ ɾͦͷܭࢉΛߦ͢Δͷ͕DFSUJGZXFCͷαʔϏε ݪཧͷཧղͱඞཁͳใ͕͋Ε୭Ͱ࠶ݱͰ͖Δ ূ໌͞ΕΔ ɻ ه͢Δ ಡΈग़ͤΔ ূ໌Λ ඞཁͱ͢Δऀʹ ։ࣔ͞ΕΔใ ˞##Dɺ͜ͷߏΛอଘ ɹ͍ͯ͠Δ͕ɺαϒπϦʔΛ ɹূ໌ཁૉԽͯͨ͠͠ޙɺ ɹূ໌͢Δ্Ͱ##D ෆཁ ެ։͞ΕΔใ ϚʔΫϧϧʔτ Ϛ ồ Ϋ ϧ γ ε ς Ϝ ͕ อ ͠ ֤ Ϣ ồ β ʹ ෦ త ʹ ͑ Δ ʜʜ ʜʜ ʜʜ ʜʜ ʜʜ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ &UIFSFVNϒϩοΫνΣʔϯ ʜ ʜ ##DϥΠϒϥϦ ূ໌ॻΞϓϦͰ࣮ݱ — Beyond Blockchain — 2020-12-07 – p.9/13
Merkle Proof ( ) { "proof": { "spec": { "subsystem":
"ethereum", "network": "ropsten", "contract": "BBcAnchor", "contract_address": "0x609CD0aF4663bbA6c7105fd34BbCBCDd5e75067C", "block": 9186681 }, "subtree": [ { "position": "right", "digest": "bd7d8c62a483e23b8e4713699bec9ff036ead7f3a72a8ff70684cdec1e8b6aeb" }, : # ] } } — Beyond Blockchain — 2020-12-07 – p.10/13
BBcAnchor.sol ( ) contract BBcAnchor { mapping (uint256 => uint)
public _digests; constructor () public { } function getStored(uint256 digest) public view returns (uint block_no) { return (_digests[digest]); } function isStored(uint256 digest) public view returns (bool isStored) { return (_digests[digest] > 0); } function store(uint256 digest) public returns (bool isAlreadyStored) { bool isRes = _digests[digest] > 0; if (!isRes) { _digests[digest] = block.number; } return (isRes); } } / — Beyond Blockchain — 2020-12-07 – p.11/13
Token ସ՟ฎ Smart Contract ݕূՄೳͳঢ়ଶϚγϯ Provenance ग़ࣗূ໌ Fungible Non-redeemable
Fungible Redeemable Non-fungible Redeemable Non-fungible Non-redeemable Certifying Identifying payment ID card security token last will logistics insurance claim Tracking Sensing fiat money crypt pet ൿີ伴Λ͑Δ͔Βຊਓʁ ෛ࠴ Ξηοτͷ දݱΛҠసͰ͖Δʁ ొ͞Εͨίʔυͱ ͦͷ࣮ߦϩάͱ݁Ռͷ ਅਖ਼ੑΛ୲อͰ͖Δʁ ݖҖ͕ Կ͔ͷ༰Λূ໌͢Δʁ ࣋ଓ͢Δଘࡏʹ͍ͭͯ هΛΞοϓσʔτՄʁ ओମ͕͍ͳ͘ͳͬͯ աڈͷσʔλ༗ޮʁ Certify Web API — Beyond Blockchain — 2020-12-07 – p.12/13
— Beyond Blockchain — 2020-12-07 – p.13/13