記録の真正性を保つ : ブロックチェーンやその他の証明技術 / Maintain authenticity of records: blockchain and other proof technologies

Transcript

1. ( ) : — 2020-12-19 – p.1/17

2. （一社）日本統合医療学会 ＣＯ Ｉ （利益相反）開示 発表者名：斉藤 賢爾 演題発表内容に関連し、発表者らに開示すべき CO I 関係にある団体等はありません。

   様式１－Ａ （過去3年間に、申告すべきCOI状態がない時）

3. ( ) SFC ( ) CSO (Chief Science Officer) 1993

   ( ) 2006 ( ) SFC 21 P2P (Peer-to-Peer) 2011 2018 2019 VR 2021.7 VR 2021.8 “ALL THESE WORLDS ARE YOURS” VR 2021.9 & VR 2021.12 ( (VR) ) ( ) → ( ) : — 2020-12-19 – p.2/17

4. : — 2020-12-19 – p.3/17

5. (1) ( ) 3 : — 2020-12-19 – p.4/17

6. (2) ↓ (1) ( ) (2) ( ) (3) (

   ) bitcoin : — 2020-12-19 – p.5/17

7. Bitcoin YouTuber ( ) ( ) ( ) ( )

   Bitcoin ( ) YouTube, Zoom, etc. ??? YouTube Zoom ( ) : — 2020-12-19 – p.6/17

8. ( ) : — 2020-12-19 – p.7/17

9. ( ) ( ) ( ) ( 16 ) SHA

   (Secure Hash Algorithm) ( ) 1bit : — 2020-12-19 – p.8/17

10. ( ) < , > ( ) ← : <

    , > : : < , , > : OK NG : — 2020-12-19 – p.9/17

11. ( ) . . . : — 2020-12-19 – p.10/17

12. ID BBc-1/Ethereum API/ https://github.com/beyond-blockchain/examples/tree/master/certify-web 1. ID ( ) 2. ID

    ID . . . ID ( ) : — 2020-12-19 – p.11/17

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 : — 2020-12-19 – p.12/17

14. *%
    Χʔυจॻ JE
    
    JE OBNF8FEOFTEBZ
    "EEBNTOBNF 8FEOFTEBZ
    "EEBNT ͷ΋ͷ ࣏ࣗମͷ΋ͷ CPSOCPSO BEESFTT
    $FNFUFSZ
    -BOFBEESFTT QVCMJDLFZEFDFECQVCMJDLFZ *%

    Χʔυจॻ ͷμΠδΣετ ॺ໊෇͖ *% Χʔυจॻ ͷμΠδΣετ ࿈͔݁ͯ͠Β ܭࢉ͢Δ ॺ໊Λݕূ͠ɺ ੒ޭͨ͠Β ࿈͔݁ͯ͠Β ܭࢉ͢Δ EJHFTU EJHFTU EJHFTU BMHPSJUIN TJHOBUVSF QVCMJD
    LFZ EJHFTU EJHFTU EJHFTU EJHFTU
    +40/ σʔλߏ଄͸ɺ಺෦ॲཧͰ͸ 9.- ʹม׵͞Ε·͢
    ΋ͱ΋ͱ 9.- ༻ʹ࡞ͬͯ͋ΔϥΠϒϥϦΛ࢖༻͍ͯ͠·͢ ɻ
    ෦෼తʹӅ͞Ε͍ͯͯ΋ূ໌Ͱ͖ΔΑ͏ʹɺηΫγϣϯ͝ͱʹμΠδΣετΛܭࢉ͍ͯ͠·͢ɻ
    ྫ͑͹ɺ*% ΧʔυͰ೥ྸ΍ॅॴɺ͋Δ͍͸ެ։伴Λ֬ೝ͢Δ͚ͩͰ͋Ε͹ɺ*% ൪߸ΛݟΔ͜ͱ͕๏཯Ͱېࢭ͞Ε͍ͯΔ౳ͷ৔߹ɺ
    
    *% ൪߸ΛӅͯ͠ ͦͷ෦෼ΛରԠ͢ΔμΠδΣετͰஔ͖׵͑ͯ ఏࣔͯ͠΋࠷ऴతʹॺ໊෇͖ *% Χʔυจॻͷಉ͡μΠδΣετΛܭࢉͰ͖ΔͷͰɺଘࡏূ໌͕Ͱ͖·͢ɻ
    ʮμΠδΣετʯͱ͸ɺ҉߸ֶతϋογϡؔ਺ʢࠓճ͸ 4)"
    ʣʹΑͬͯܭࢉ͞Εͨ஋ͷ͜ͱͰ͢ɻ
    Θ͔ͣ  ϏοτͰ΋ݩͷσʔλ͕ҟͳΔͱɺฦͬͯ͘Δ஋͕શ͘ҟͳΓɺμΠδΣετ͔ΒݩͷσʔλΛ
    ਪଌ͢Δ͜ͱ͸Ͱ͖·ͤΜɻ : — 2020-12-19 – p.13/17

15. API/ Merkle Proof จ
    
    ॻ  จ
    
    ॻ  จ

    
    
    ॻ  จ ॻ  จ
    
    ॻ O μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ μΠδΣετ ح਺ͷ৔߹͸ ෳ੡͢Δ ɾจॻ 
    Λಘͨ
    " ࢯ͸ɺಉ࣌ʹূ໌ཁૉͱͯ͠ɺϒϧʔͰࣔ͞ΕΔμΠδΣετͱ֤ʑ͕ࠨӈͷͲͪΒʹҐஔ͢Δ͔Λड͚औΔɻ ɾ" ࢯ͸จॻ  ͷμΠδΣετ͔Β࢝Ίͯɺ࿈݁͢΂͖Ұ࿈ͷμΠδΣετΛ஌Δ͜ͱʹͳΔͷͰɺϚʔΫϧϧʔτʹࢸΔ·Ͱͷ ɹܭࢉΛ࠶ݱͰ͖ɺಘΒΕͨϚʔΫϧϧʔτ͕ &UIFSFVN εϚʔτίϯτϥΫτʹه࿥͞Ε͍ͯΔ஋ͱҰக͢Δ͜ͱΛ֬ೝͰ͖Δɻ ɾͦͷܭࢉΛ୅ߦ͢Δͷ͕
    DFSUJGZXFC
    ͷαʔϏε
    ݪཧͷཧղͱඞཁͳ৘ใ͕͋Ε͹୭Ͱ΋࠶ݱͰ͖Δ  ূ໌͞ΕΔ ɻ ه࿥͢Δ ಡΈग़ͤΔ ূ໌Λ ඞཁͱ͢Δऀʹ ։ࣔ͞ΕΔ৘ใ ˞
    ##D
    ͸ɺ͜ͷߏ଄Λอଘ ɹ
    ͍ͯ͠Δ͕ɺαϒπϦʔΛ ɹ
    ূ໌ཁૉԽͯ͠౉ͨ͠ޙ͸ɺ ɹ
    ূ໌͢Δ্Ͱ͸
    ##D ͸ෆཁ ެ։͞ΕΔ৘ใ 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 &UIFSFVN
    ϒϩοΫνΣʔϯ ʜ ʜ ##D
    ϥΠϒϥϦ
    ূ໌ॻΞϓϦͰ࣮ݱ : — 2020-12-19 – p.14/17

16. Merkle Proof ( ) { "proof": { "spec": { "subsystem":

    "ethereum", "network": "ropsten", "contract": "BBcAnchor", "contract_address": "0x609CD0aF4663bbA6c7105fd34BbCBCDd5e75067C", "block": 9186681 }, "subtree": [ { "position": "right", "digest": "bd7d8c62a483e23b8e4713699bec9ff036ead7f3a72a8ff70684cdec1e8b6aeb" }, : # ] } } : — 2020-12-19 – p.15/17

17. 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); } } / : — 2020-12-19 – p.16/17

18. : — 2020-12-19 – p.17/17