Dash (formerly known as Darkcoin and XCoin) is an open source peer-to-peer cryptocurrency that uses a system called Darksend to add privacy to transactions.It was rebranded from "Darkcoin" to "Dash" on March 25, 2015, a portmanteau of "Digital Cash". Dash uses a chained hashing algorithm approach called X11 for the proof-of-work. Instead of using the SHA-256 (from well-known Secure Hash Algorithm family) or scrypt it uses 11 rounds of different hashing functions.

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Darksend is a coin-mixing service originally based on CoinJoin. Later iterations used a more advanced method of pre-mixing denominations built into the user's wallet.

In its current implementation it adds privacy to transactions by combining identical inputs from multiple users into a single transaction with several outputs. Due to the identical inputs, transactions usually cannot be directly traced, obfuscating the flow of funds. A heuristic (based on inputs/outputs order) was suggested for partial tracing the transactions, but neither formal proof nor counter-proof was presented. More info: www.dash.org