It is a bullish signal in technical candlestick pattern by comparing two lines of short-term moving average and long-term average. It is a golden cross when the short term moving average broke its long-term moving average because it means the short-term momentum is above its long-term momentum. There are three stages to a golden cross, where the first stage is when the downtrend has bottomed out. The second stage is when short-term moving average moves from below to above the long-term moving average. The last one is a sustained uptrend to higher prices. The opposite movement of golden cross is called death cross.
An acronym for Zero-Knowledge Succinct Non-Interactive Argument of Knowledge, zk-SNARKs refers to a protocol where one can prove posession of a given piece of information (eg a string or hash) without revealing that information and also without any interaction between both the prover & verifier.