This could be in the form of a 'pass' (=password) argument given at encoding and needed to decode a given link, which otherwise would prevent you from accessing the decoded value.
[ ] Add 'password' argument to /encode and /decode
[ ] Add 'password' (hashed?) to the links table
[ ] This would propably require a "passphrase" secret if the passwords in the DB are encoded
This could be in the form of a 'pass' (=password) argument given at encoding and needed to decode a given link, which otherwise would prevent you from accessing the decoded value.