A whale address (bc1q9) deposited 438.37 BTC, worth approximately $35.38 million, to Coinbase Prime over the past night, according to Arkham monitoring data. The same wallet had withdrawn 615.4 BTC from Coinbase Prime custody 16 months ago at an average price of $105,271. With Bitcoin now trading at $80,807, the position carries an unrealized loss exceeding $15 million. The whale still holds approximately $14.31 million worth of BTC.