Bitcoin (CRYPTO: BTC) briefly popped up above the $20,000 mark on Friday when the S&P 500 spiked higher, before running into a group of sellers who pushed the crypto back under the level. Dogecoin (CRYPTO: DOGE) followed suit, temporarily rising up above Thursday’s 24-hour trading session high, while Ethereum Classic (CRYPTO: ETC), the weaker of the three cryptos, was unable to move notably higher.