New arXiv articles are now automatically assigned DOIs | arXiv.org blog

"New articles submitted to arXiv are now automatically assigned DOIs that align with their arXiv ID. This makes research articles more discoverable across search engines because associated metadata is made available to the community in a reusable format. DOIs (digital object identifiers) are unique and unchanging, just like the original arXiv ID number already assigned to every arXiv article. However, because DOIs are used across many different platforms, they enable greater interoperability with other services...."