The claim is strongly supported by the primary source, PR Newswire’s 'Canaan Inc. Provides March 2026 Bitcoin Production and Mining Operation Updates,' which explicitly states that Canaan mined 89 BTC in March, held 1,808 BTC and 3,952 ETH at month-end, added over 10 MW during the month, and reached 266.3 MW of global installed power capacity. Canaan’s own investor-relations release page repeats the same figures, providing direct official corroboration. The StockTitan mirror also reflects the same numbers, though it is lower-authority than the official sources.