Arkham has transferred $487 million worth of ARKM tokens to Coinbase Prime for tax compliance and regulatory purposes. This transfer involved withdrawing 304.5 million ARKM tokens from Arkham's vesting contract and moving them to Coinbase Prime custody. The transaction also included 115.8 million ARKM tokens owned by Arkham's CEO, Miguel Morel. The move is aimed at ensuring tax compliance and enhancing the security and regulatory supervision of the assets.