Zero Link ~ Stealth Addresses

While fungibility is an essential property of good money, Bitcoin has its limitations in this area. Numerous fungibility improvements have been proposed; however none of them have addressed the privacy issues in full. ZeroLink is first to offer protections against all the different ways a user's privacy can be breached. The scope of ZeroLink is not limited to a single transaction, it extends to transaction chains and it addresses various network layer deanonymizations, however its scope is limited to Bitcoin's first layer. Even if an off-chain anonymity solution gets widely adopted, ultimately the entrance and exit transactions will always be settled on-chain. Therefore there will always be need for on-chain privacy.

Ideal fungibility requires every Bitcoin transaction to be indistinguishable from each other, but it is an unrealistic goal. ZeroLink's objective is to break all links between separate sets of coins. ZeroLink presents a wallet privacy framework coupled with Chaumian CoinJoin, which was first introduced in 2013 by Gregory Maxwell. A mixing round runs within seconds, its anonymity set can go beyond a single CoinJoin transaction's if needed, and its DoS resilience presumes a transaction fee environment above $1 Bitcoin.

Zero Link is implemented in Wasabi and Samourai Wallet.

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