A latest block associated with a blockchain is received at a blockchain node device, where the blockchain node device includes a first storage system and a second storage system, and where the second storage system is interconnected with the first storage system. The latest block is stored at the blockchain node device and in the first storage system. Whether a migration trigger event for block data stored in the first storage system is detected determining by the blockchain node device. The block data stored in the first storage system and exists prior to a migration reference time is migrated to the second storage system.