Paper Info
Title
Unlinkable Coin Mixing Scheme for Transaction Privacy Enhancement of Bitcoin.
Abstract
Bitcoin combines a peer-to-peer network and cryptographic algorithm to implement a distributed digital currency system, which keeps all transaction history on a public blockchain. Since all transactions recorded on the blockchain are public to everyone, Bitcoin users face a threat of leaking financial privacy. Many analysis and deanonymization approaches have been proposed to link transaction records to real identities. To eliminate this threat, we present an unlinkable coin mixing scheme that allows users to mix their bitcoins without trusting a third party. This mixing scheme employs a primitive known as ring signature with elliptic curve digital signature algorithm (ECDSA) to conceal the transfer of coins between addresses. The mixing server is only able to check whether the output addresses belong to its customers, but it cannot tell which address owned by which customer. Customers do not have to rely on the reputation of a third party to ensure his money will be returned, and his privacy will not be leaked. This scheme needs no modifications on current Bitcoin system and is convenient to deploy by any communities. We implemented a prototype of our scheme and tested it under the Bitcoin core's regtest mode. Security and privacy of our mixing scheme are ensured through the standard ring signature and ECDSA unforgeability.
Year
DOI
Venue
2018
10.1109/ACCESS.2018.2827163
IEEE ACCESS
Keywords
Field
DocType
Anonymity,Bitcoin,coin mixing,ECDSA,ring signature
Elliptic Curve Digital Signature Algorithm,Digital currency,Cryptography,Computer science,Ring signature,Computer network,Financial privacy,Database transaction,Public-key cryptography,Reputation
Journal
Volume
ISSN
Citations 
6
2169-3536
5
PageRank 
References 
Authors
0.44
0
5
Name
Order
Citations
PageRank
Yi Liu1134.43
Xingtong Liu250.78
Chaojing Tang32915.21
Jian Wang47640.08
Lei Zhang5113.75