No, CoinDesk, Satoshi’s Local Time Zone Wasn’t UTC+8

  • Satoshi used’s webmail client to send emails, making the timezone in the Date header field therein irrelevant.
  • This time zone is naturally the same as the one in the Received header field of the same emails.

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In one of their latest articles, CoinDesk reveals previously-unseen email correspondence between Satoshi Nakamoto and Hal Finney. The article quickly lays out the data, showing several screenshots of the emails — headers included.

Writer Michael Kapilkov then brings attention to the time zone of the Date header field in the emails, which, in all emails from Nakamoto to Finney, is set to UTC+8 — a time zone of the far-east regions of Asia.

Screenshot of an email from Satoshi Nakamoto to Hal Finney
Screenshot of an email from Satoshi Nakamoto to Hal Finney. CoinDesk

On first glance, this appears to support the theory that Satoshi was located somewhere in Asia, however, a close examination of the emails disproves that.

The Date header in emails is set by the mail client that is used to create the email, e.g., Thunderbird, Mailbird, Postbox, or any webmail service. In the case of desktop applications like Thunderbird and Mailbird, the time zone that is applied to the Date header field is the local time zone of the computer.

However, when a webmail client is used, the time zone is taken from the server where the webmail is hosted. For his vistomail correspondence, Satoshi used’s webmail client. It took us 10 minutes of research to confirm that beyond reasonable doubt.

First of all, is a platform specifically designed for sending anonymous emails — their slogan is “Leader in Anonymous Email”. We know Satoshi used that platform because the Received header of the emails specifies an mail server:

Received: from ( [])

Second, supports vistomail, even to this day. Third, the X-Mailer header of the emails defines the mail client Satoshi used to send the emails — Chilkat Software Inc. Chilkat Software is a cross-platform API for “many Internet protocols”, including email. It is reasonable to assume that’s webmail client was using Chilkat’s .NET API. This is reaffirmed by’s use of .NET, which is obvious from the URL for the Send Anonymous Email page.

Lastly, a research recently published by The Chain Bulletin unequivocally proves that Satoshi didn’t live in Asia while working on Bitcoin.

Why is UTC+8? We can see from a November 2006 web archive: LLC specializes in international law and IT security consulting, based in Tokyo, Japan since 1996. We are mainly active in Japanese, consulting clients on international legal issues and internet security.

Long story short, the sender time zone in those newly-released emails between Satoshi and Hal Finney — in cases when Satoshi was the sender — is not the local time zone of Satoshi’s computer, but rather, the time zone of’s webmail client, which is naturally the same time zone as’s mail server.

Related Coverage
Satoshi Nakamoto Lived in London While Working on Bitcoin. Here’s How We Know.
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  • Other available data gave us clues that helped us determine, with reasonable confidence, where he lived.
November 23, 2020, 1:56 PM

Image from Shutterstock

Satoshi Used Timestamps For Early Bitcoin Source Code Versioning
  • We analyse early Bitcoin source code archives – a preliminary version from November 2008, 0.1.0 (both RAR and TGZ), and 0.1.3.
  • We conclude that Satoshi used timestamps as a versioning scheme, before the SourceForge repository was established in mid-2009.
The “Unmasking Satoshi” Aftermath
  • A YouTube video creator who goes by the moniker Barely Sociable has given the community his take on the identity of Satoshi Nakamoto.
  • His work has received disappointing responses, focusing more on partisanship than arguments.