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Chameleon Hash Time-Lock Contract for Privacy Preserving Payment Channel Networks

  • Bin Yu
  • Shabnam Kasra KermanshahiEmail author
  • Amin Sakzad
  • Surya Nepal
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11821)

Abstract

Payment channel networks (PCNs) have been proposed to address the low transaction throughput of the permissionless blockchain protocols. Though the PCNs allow users to have the unlimited number of transactions in the channel without interacting with blockchain, it leaks the entire payment paths to the public. To address the payment path leakage issue, we propose a Chameleon-hash based payment protocol, called Chameleon Hash Time-Lock Contract (CHTLC). Using Chameleon-hash function in a multi-layer fashion guarantees that no user can recover the payment path if at least one intermediate payment node is honest. For the same payment path, compared with Multi-hop Hash Time-Lock Contract (MHTLC) protocol of Malavolta et al. [1], CHTLC is 5 times faster in the payment data initialisation, and the communication bandwidth is reduced significantly from 17, 000 KB to just 7.7 KB.

Keywords

Blockchain Payment channel networks Payment privacy 

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Bin Yu
    • 1
    • 2
  • Shabnam Kasra Kermanshahi
    • 1
    • 2
    Email author
  • Amin Sakzad
    • 1
  • Surya Nepal
    • 2
  1. 1.Monash UniversityMelbourneAustralia
  2. 2.CSIRO Data 61MelbourneAustralia

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