Japanese investment firm Metaplanet has increased its Bitcoin put options, adjusting the strike price to $66K from $62K.Metaplanet expects this move to boost its option sale yield and generate an additional premium income of 57.9 million yen ($388,123).Metaplanet's total holdings have reached 861.387 BTC after a recent transaction that generated a net income of 5.9095 BTC.Metaplanet has gained prominence as 'Asia's MicroStrategy' for its consistent BTC acquisitions and recently purchased an additional 106.976 BTC.