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The Basics
Ring CT was implemented in block #1220516 in January 2017. After September 2017, this feature became mandatory for all transactions on the network.
RingCT, short for Ring Confidential Transactions, is how transaction amounts are hidden in Monero.
["ringCT", "ring-CT"]
RingCT introduces an improved version of @ring-signatures called "A Multi-layered Linkable Spontaneous Anonymous Group signature", which allows for hidden amounts, origins and destinations of transactions with reasonable efficiency and verifiable, trustless coin generation.
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For more information, please read the creator Shen Noether's paper [here](https://eprint.iacr.org/2015/1098).
a way to hide the amount sent in a Monero transaction