[Digital object identifiers (DOIs)](https://en.wikipedia.org/wiki/Digital_object_identifier) are handles that uniquely and persistently identify various objects, particularly academic and scientific information.

The aim of DOIs is to provide a fixed identifier for the life of an object even if the object's location or address (also known as a uniform recourse identifier or URI) changes over time. If systems which reference this object use its DOI, the publisher of the URI can change the address in one location and all references to that URI will reflect the change while the original reference, or DOI, remains constant.

Current handle services which require a single authority to issue DOIs make existing services prone to centralization and a yearly subscription fee negates one of the most important use cases for permanent identifiers; permanence. Quadratic Identifiers solve both these shortcomings by handing of management, payment and resolution of digital identifiers to a smart contract, providing decentralization of architecture and true permanance via the blockchain.

A more in-depth discussion about Quadratic Identifiers and the problem that they solve can be viewed at https://quadratic.systems/.

A working testnet version of Quadratic Identifier Registration is available at https://registrar.quadratic.systems/. It is currently being internally tested and will be available to a select number of key users in the near future.