Coinbase predicts strong growth in altcoins in September According to Assemble AI, Coinbase's report predicts that September will usher in a significant counterfeit season as Bitcoin's dominant position declines. The report points out that Bitcoin's market share has declined from 65% to 59%, and early signals of capital rotation towards altcoins have been observed. Although the current altcoin season index is only 40, far below the threshold of 75, Coinbase remains optimistic due to the expected increase in liquidity.