Goldshell CKB Nervos miner control board replacement The CK6 replacement control board is used to repair and replace the damaged Goldshell CKB Nervos miner control board, helping the miner to resume operation. GoldShell CK6 miner uses the Eaglesong algorithm, which is only used to mine Nervos coins. All control boards are rigorously tested before shipment to ensure proper operation.