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To strengthen the anonymity of Bitcoin, several centralized coin-mixingproviders (mixers) such as BitcoinFog.com, BitLaundry.com, and Blockchain.infoassist users to mix Bitcoins through CoinJoin transactions with multiple inputsand multiple outputs to uncover the relationship between them. However, thesemixers know the output address of each user, such that they cannot provide trueanonymity. This paper proposes a centralized coin-mixing algorithm based on anelliptic curve blind signature scheme (denoted as Blind-Mixing) that obstructsmixers from linking an input address with an output address. Comparisons amongthree blind signature based algorithms, Blind-Mixing, BlindCoin, and RSACoin-Mixing, are conducted. It is determined that BlindCoin may be deanonymizedbecause of its use of a public log. In RSA Coin-Mixing, a user's Bitcoins maybe falsely claimed by another. In addition, the blind signature scheme ofBlind-Mixing executes 10.5 times faster than that of RSA Coin-Mixing.

A Blind-Mixing Scheme for Bitcoin based on an Elliptic Curve Cryptography Blind Digital Signature Algorithm