Hidden coins and amounts

Coins that cannot be traced to their mint, and amounts that add up without being shown.

Zerocoin: spending a coin without saying which (2013)

Zerocoin: spending a coin without saying which (2013)

Confidential transactions: amounts that add up unseen (2015)

Confidential transactions: amounts that add up unseen (2015)

RingCT: hiding the input and the amounts together (2016)

RingCT: hiding the input and the amounts together (2016)

Mimblewimble: transactions with no addresses, and cut-through (2016)

Mimblewimble: transactions with no addresses, and cut-through (2016)