The registry contains supporting pages wri en in Markdown hosted on GitHub (github.com/nanocommons/identifiers) and a central registry of materials in Turtle (github.com/NanoCommons/identifiers/blob/master/registry). The webpage was autogenerated by GitHub Pages. The European Registry of Materials Identifier was registered with FAIRSharing and identifiers.org . The la er provided us with an official compact identifier structure . The registry Turtle uses the RDF Schema specification for storing labels and types of nanomaterials as chemical substances, using the CHEBI_59999 term from the ChEBI ontology .