Abstract
Since the advent of bitcoin, the privacy of bitcoin has become a hot issue. Many coin mixing protocols guarantee the anonymity and unlinkability of the payer and payee of a transaction. However, due to the publicity of blockchain, the confidentiality of transaction amounts has not been provided. Everyone has the chance to get the amount of a transaction, which poses a challenge to the privacy of users.
To overcome the problem, we propose an improved mixing protocol based on TumbleBit, which is named TumbleBit++. TumbleBit++ combines confidential transactions with centralized untrusted anonymous payment hub, and achieves the protection of transaction amounts without undermining the anonymity of TumbleBit. TumbleBit++ allows multiple payers to trade in different transaction amounts, and Tumbler, as an untrusted third party, does not know the exact amount of each transaction and the flow of funds between the payer and payee of one transaction.
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Acknowledgement
The authors are supported by the National Natural Science Foundation of China (Grant No. 61672347, 61572318, 61672339, 61872142), the National Cryptography Development Fund (No. MMJJ20170111) and Minhang Technology Innovation Program for SMEs, a finance business platform based on blockchain technology (2018MH110).
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Liu, Y. et al. (2019). TumbleBit++: A Comprehensive Privacy Protocol Providing Anonymity and Amount-Invisibility. In: Steinfeld, R., Yuen, T. (eds) Provable Security. ProvSec 2019. Lecture Notes in Computer Science(), vol 11821. Springer, Cham. https://doi.org/10.1007/978-3-030-31919-9_21
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DOI: https://doi.org/10.1007/978-3-030-31919-9_21
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