This can be understood to be "records" (called "blocks") that are linked together to record transactions between two parties but cannot be altered.
Tan waxaa loo fahmi karaa inay tahay "diiwaanno" (oo loo yaqaan "baloogyo") oo ku wada xiran si ay u duubaan macaamil dhexmara laba dhinac laakiin aan la beddeli karin.