Presentation 2022-06-23
Distributed Clock Synchronization Protocol for Proof of Stake Blockchain
Yuya Miki, Kazuyuki Shudo,
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Abstract(in Japanese) (See Japanese page)
Abstract(in English) In a Proof of Stake (PoS) blockchain, all nodes need to be able to recognize approximately synchronized clocks. A PoS blockchain relies on external clocks, and each node synchronizes its local clock according to an external clock using Network Time Protocol (NTP) or a similar protocol. However, this external dependence is undesirable because it reduces the autonomy, sustainability and trustless nature of the blockchain. This paper presents a clock synchronization protocol for slot-based PoS blockchains. The proposed protocol estimates the block propagation time to ensure that the synchronization is closer to that of a real-world clock. In addition, the proposed method considers the clock drift and clock adjustment frequency to achieve more accurate synchronization. Simulation experiments show that the proposed method can synchronize with a time that is closer to that of a real-world clock and with higher accuracy than existing methods.
Keyword(in Japanese) (See Japanese page)
Keyword(in English) Blockchain / Clock synchronization / Block propagation time / Ethereum
Paper # IA2022-2,ICSS2022-2
Date of Issue 2022-06-16 (IA, ICSS)

Conference Information
Committee IA / ICSS
Conference Date 2022/6/23(2days)
Place (in Japanese) (See Japanese page)
Place (in English) Univ. of Nagasaki
Topics (in Japanese) (See Japanese page)
Topics (in English) Internet Security, etc.
Chair Tomoki Yoshihisa(Osaka Univ.) / Katsunari Yoshioka(Yokohama National Univ.)
Vice Chair Toru Kondo(Hiroshima Univ.) / Yuichiro Hei(KDDI Research) / Hiroshi Yamamoto(Ritsumeikan Univ.) / Kazunori Kamiya(NTT) / Takahiro Kasama(NICT)
Secretary Toru Kondo(Osaka Univ.) / Yuichiro Hei(Kogakuin Univ.) / Hiroshi Yamamoto(NEC) / Kazunori Kamiya(KDDI labs.) / Takahiro Kasama(Okayama Univ.)
Assistant Daisuke Kotani(Kyoto Univ.) / Ryo Nakamurai(Fukuoka Univ.) / Daiki Nobayashi(Kyushu Inst. of Tech.) / Keisuke Kito(Mitsubishi Electric) / Takeshi Sugawara(Univ. of Electro-Comm.)

Paper Information
Registration To Technical Committee on Internet Architecture / Technical Committee on Information and Communication System Security
Language JPN
Title (in Japanese) (See Japanese page)
Sub Title (in Japanese) (See Japanese page)
Title (in English) Distributed Clock Synchronization Protocol for Proof of Stake Blockchain
Sub Title (in English)
Keyword(1) Blockchain
Keyword(2) Clock synchronization
Keyword(3) Block propagation time
Keyword(4) Ethereum
1st Author's Name Yuya Miki
1st Author's Affiliation Tokyo Institute of Technology(Tokyo Tech)
2nd Author's Name Kazuyuki Shudo
2nd Author's Affiliation Tokyo Institute of Technology(Tokyo Tech)
Date 2022-06-23
Paper # IA2022-2,ICSS2022-2
Volume (vol) vol.122
Number (no) IA-85,ICSS-86
Page pp.pp.8-14(IA), pp.8-14(ICSS),
#Pages 7
Date of Issue 2022-06-16 (IA, ICSS)