According to @cas_abbe, BlackRock has started buying BTC and ETH, executing about $51 million in ETH and $44 million in BTC on Coinbase, as stated in an X post dated Nov 28, 2025 (source: @cas_abbe on X). According to the source, the post specifies Coinbase as the venue but does not include on-chain transaction IDs or official confirmation, a factor traders may consider when assessing signal reliability (source: @cas_abbe on X).