Goldsmiths from other towns became curious about his activities and one day they called to see him. He told them what he was doing, but was very careful to emphasize the need for secrecy.
If their plan was exposed, the scheme would fail, so they agreed to form their own secret alliance. Each returned to his own town and began to operate as Fabian had taught.
People now accepted the receipts as being as good as gold itself, and many receipts were deposited for safe keeping in the same way as coins. When a merchant wished to pay another for goods, he simply wrote a short note instructing Fabian to transfer money from his account to that of the second merchant. It took Fabian only a few minutes to adjust the figures.