F1 Unique identfiers

(Meta)data are assigned a globally unique and persistent identifier. Learn more

An UUID is a 128-bit number used to identify information in computer systems RFC4122

Digital Object Identifier (DOI) ISO 26324:2012 Digital object identifier system

An URI is a string of characters that unambiguously identifies a particular resource. To guarantee uniformity, all URIs follow a predefined set of syntax rules, but also maintain extensibility through a separately defined hierarchical naming scheme (e.g. http://). RFC3986

Each material entry in the database is assigned a unique identifier in the form of a UUID doi:10.3762/bjnano.6.165

A reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it. A URL is a specific type of URI. RFC3986

The European Registry of Materials is a simple registry with the sole purpose to mint material identifiers to be used by research projects throughout the life cycle of their project. ERM@github

The primary identifiers for the Substance, Compound and BioAssay databases are SID (SubstanceID), CID (CompoundID) and AID (AssayID), respectively. PubChem Substance and Compound databases

ORCID provides a persistent digital identifier (an ORCID iD) that you own and control, and that distinguishes you from every other researcher. ORCID