The assessment is based on a strong convergence of evidence from multiple, high-authority sources. The statement is directly and precisely supported by a social media post from the on-chain analysis account EyeOnChain, which states Machibigbrother deposited $249,839.40 in USDC for his ETH long position. This claim is independently corroborated by another reputable on-chain analytics firm, Lookonchain, which reported the same event with a rounded figure of "~250K USDC".The credibility of these claims is significantly bolstered by the inclusion of the primary source: a link to the machibigbrother.eth wallet on a blockchain explorer. This link allows for direct, public verification of the on-chain transaction. The reporting from EyeOnChain and Lookonchain is an interpretation of this raw data, and their agreement on the event provides high confidence in its accuracy.Further contextual support comes from a news article that, while not specifying the amount, confirms that Machibigbrother was indeed increasing his Ethereum long position around this time. Other sources that mention different transaction amounts are clearly reporting on older, separate events and do not contradict the specific claim in question. The absence of any conflicting evidence, combined with strong, consistent, and verifiable primary and secondary sources, makes the statement highly likely to be true.