Do you know how bitcoin addresses are constructed?
This a number. A big number specifically. If it were a bitcoin secret key, what would its (uncompressed) address be?
Test VectorTest that your implementation is working. The following are some secret keys and their associated uncompressed bitcoin addresses.
1 -> 1EHNa6Q4Jz2uvNExL497mE43ikXhwF6kZm 2 -> 1LagHJk2FyCV2VzrNHVqg3gYG4TSYwDV4m 3 -> 1NZUP3JAc9JkmbvmoTv7nVgZGtyJjirKV1 4 -> 1MnyqgrXCmcWJHBYEsAWf7oMyqJAS81eC 5 -> 1E1NUNmYw1G5c3FKNPd435QmDvuNG3auYk