FOAM Protocol is a personal spatial location tracking protocol and associated data marketplace, based on Ethereum. FOAM aims to solve three key problems of existing spatial protocols: inconsistent location encoding standards, poor user experience for spatial applications, and secure verification of the authenticity of the location data. Location data will be accessible and verifiable within an Ethereum smart contract. The platform will also develop a token curated registry (TCR) for geographic points of interest. The native FOAM token will provide curation rights to this TCR and to incentivize user maintenance of hardware beacon nodes that maintain local location data.