Presentation 2017-04-20
A fast and secure payment confirmation method in Bitcoin
Kento Nakanishi, Satoshi Ohzahata, Toshihiko Kato,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) Bitcoin published in 2008 has been supported development of cryptographic currency in recent years. The blockchain is one of the key technologies of the Bitcoin and its various applications are discussed. Proof of Work (PoW) is often adopted as a consensus protocol in the blockchain, and a right of the vote is given for a proportion of computer’s computational power. Bitcoin, most widely used in cryptographic currency, also adopts PoW. However, PoW-based blockchain application requires a long period until completing it’s payment. Then, Bitcoin cannot complete its payment from 10 minutes to one hour. This paper discusses parameters of Bitcoin in order to accelerate completion of the payment with maintaining the security strength, and applicability of the parameter setting. Key words Proof of Work Blockchain double-spending fast-payment Bitcoin
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Proof of Work / Blockchain / soudble-spending / fast-payment / Bitcoin
Paper # NS2017-3
Date of Issue 2017-04-13 (NS)

Conference Information
Committee NS
Conference Date 2017/4/20(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Toyama Shoko Kaigisyo
Topics (in Japanese) (See Japanese page)
Topics (in English)
Chair Hideki Tode(Osaka Pref. Univ.)
Vice Chair Yoshikatsu Okazaki(NTT)
Secretary Yoshikatsu Okazaki(Kyushu Inst. of Tech.)
Assistant Shohei Kamamura(NTT)

Paper Information
Registration To Technical Committee on Network Systems
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) A fast and secure payment confirmation method in Bitcoin
Sub Title (in English)
Keyword(1) Proof of Work
Keyword(2) Blockchain
Keyword(3) soudble-spending
Keyword(4) fast-payment
Keyword(5) Bitcoin
1st Author's Name Kento Nakanishi
1st Author's Affiliation The University of Electro-Communications(UEC)
2nd Author's Name Satoshi Ohzahata
2nd Author's Affiliation The University of Electro-Communications(UEC)
3rd Author's Name Toshihiko Kato
3rd Author's Affiliation The University of Electro-Communications(UEC)
Date 2017-04-20
Paper # NS2017-3
Volume (vol) vol.117
Number (no) NS-3
Page pp.pp.13-18(NS),
#Pages 6
Date of Issue 2017-04-13 (NS)