Created in sixteenth-century Europe by a handful of merchant-bankers, fair-money was the first example of a fully virtual currency functioning within a specific historical context. It enabled increasingly efficient international payments in a fragmented monetary landscape and functioned through a stakeholder-based consensus mechanism reminiscent of the proof-of-stake systems underpinning many contemporary cryptocurrencies. Fair money operated as a peer-to-peer unit of account, defined and accepted by its users, and was used to settle multilateral obligations without the need for physical cash settlements. The fully decentralized nature of its ledgers and accounting systems ensured the auditability of transactions while maintaining privacy, stability, and interoperability across different currencies and markets. Initially designed to support international trade within the Genoese exchange fairs, fair-money eventually assumed the characteristics of an investment vehicle and later became a target of speculation, leading to its transformation into a highly opaque capital market serving a restricted circle of merchant-bankers aligned with the interests of the Spanish crown. This case study provides a historical genealogy of virtual currency, illustrating the tensions between international monetary stability, speculation, and governance that continue to shape debates around cryptocurrencies and stablecoins today.