Bitcoin diploma book 
Thanks to nostr:nprofile1qqs0l09hq60h4fwkmvffavu70k9f0z2xd5j45cmm4s0tlpshkpt5q3qpr3mhxue69uhkvunewd5kzm3wdehhxarjd93kstnrv9ekztcpr3mhxue69uhkjmnwv4ezuum9vfshxarf0qh8xmmrd9skctcpzamhxue69uhhyetvv9ujuurjd9kkzmpwdejhgtcahyfg0 got it at the meetup
#BitcoinFriesland
