check signature last bytes for duplicates
check signature last bytes for duplicates

duckx/nxt,Ziftr/nxt,dmkaplan2000/nxt_dmk,fimkrypto/nxt,fimkrypto/nxt,metrospark/czarcraft,metrospark/czarcraft,metrospark/czarcraft,Ziftr/nxt,dmkaplan2000/nxt_dmk,duckx/nxt,fimkrypto/nxt,duckx/nxt,Ziftr/nxt,fimkrypto/nxt,dmkaplan2000/nxt_dmk