18tunlkx51rgfyqyjmqgre3zz6ankdawc5

echo "18tunlkx51rgfyqyjmqgre3zz6ankdawc5" > reference.lit litcheck --file mydata.bin --lit reference.lit

The string 18TunLkX51RgFYQyjmqgRE3zZ6ankDawC5 belongs to the format. This format was the original address standard introduced by Satoshi Nakamoto in 2009. Every legacy address features specific identifier traits: 18tunlkx51rgfyqyjmqgre3zz6ankdawc5

Which are you currently using to manage it? echo "18tunlkx51rgfyqyjmqgre3zz6ankdawc5" > reference