<prompt> Hlalosa hore na blockchain ke eng ka mantsoe a ka tlase ho 20.nan  <response>: Instruction in English: Describe what a blockchain is in less than 20 words. . Response in English: A blockchain is a decentralized, digital ledger of transactions recorded on multiple computers and secured through cryptography. . Response in Sesotho: Blockchain ke ledger e arolelanoeng, ea dijithale ea litšebelisano tse tlalehiloeng ho likhomphutha tse ngata mme e sirelelitsoe ka mokhoa oa ho ngola. 