The evidence from the provided high-authority sources strongly and consistently supports the statement. The claim that 'US markets increased in value' at the open is directly confirmed by a major financial news report, which states the S&P 500 and Nasdaq rose 'shortly after the opening bell'. This is further corroborated by multiple other sources describing a broad 'rally' and a 're-open rally'.The second part of the claim, regarding 'gains in technology... stocks,' is also very well-supported. One report explicitly identifies 'big tech stocks' as the leaders of the gains. Another highlights a significant 2.3% rise in the 'tech-heavy Nasdaq index'. Furthermore, data for the Invesco QQQ ETF, a key proxy for the technology sector, shows a positive gain, reinforcing this point.The final part of the claim, concerning 'gains in... blockchain stocks,' is not explicitly mentioned in any source summary. However, these stocks are a subset of the technology sector and are predominantly listed on the Nasdaq exchange. The powerful, broad-based rally in the Nasdaq and the tech sector as a whole makes it highly probable that blockchain stocks also participated in the gains. While this point relies on inference rather than direct confirmation, the strength of the supporting evidence for the broader market and tech sector creates a high likelihood for its truthfulness. There is no contradictory evidence across any of the provided sources.