Motivated by questions such as Double blind review allowing arXiv submissions :

is there a respectable e-print website (ideally Arxiv itself) that allows me to submit a "blind preprint", i.e., post a preprint without revealing its authors publicly? This would allow authors to have a preprint published, without breaking double-blind for journal submissions.

Ideally, the website would then include a way to contact the authors anonymously to discuss the paper.