<prompt> Akaretsa hore na Blockchain ke eng ka polelo e le ngoe.nan  <response>: Instruction in English: Summarize what a Blockchain is in a single sentence. . Response in English: A blockchain is a decentralized and distributed digital ledger used to record transactions across numerous computers, ensuring transparency and security through cryptographic means. . Response in Sesotho: Blockchain ke ledja ea dijithale e arolelanoeng le e ajoang e sebelisetsoang ho rekota litšebelisano ka hara likhomphutha tse ngata, ho netefatsa pepenene le tsireletso ka mokhoa oa cryptographic. 