Revealing Obscure Digital Breadcrumbs: Past Gold Mines in Online Investigations

Navigating the vast expanse of the internet, experienced OSINT professionals understand that the most precious clues often emerge from the most unexpected sources. We reached out to the OSINT community to ask what obscure digital breadcrumbs have proven to be the golden keys to past investigations. In this blog post, we summarise the collective wisdom, disclosing the hidden gems that can lead to profound breakthroughs in online investigation.

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1. Certain Animals, Jewelry, and Server HTTP Response Headers:

Believe it or not, some online investigations have taken an unexpected turn when investigators noticed certain animals or jewelry in images posted online. These seemingly unrelated elements have led to the identification of locations and individuals. Additionally, paying attention to server HTTP response headers can reveal information about the technology stack used by a website, providing valuable clues about its origin.

2. Sidewalks:

An overlooked but highly informative breadcrumb is the sidewalk. Examining details of sidewalks in images can help determine locations , as the patterns and materials used often vary from one country to another. Most importantly, sidewalks can be unique to specific countries or regions, thus helping the investigator to narrow down the location.

3. Elements Hidden Within Source Code, XML Data, and Certificate Components:

Digital breadcrumbs can be found in the source code. By meticulously combing through website source code, investigators can uncover hidden details, links to other websites, and even security vulnerabilities. Additionally, XML data gathered during uploads and certificate components can reveal information about the infrastructure and security protocols of a website.

4. Geolocation Clues:

When it comes to geolocation, minor details can be game-changers. Reflections, angles, and landscape features in photographs can provide valuable hints about the location where the image was taken. These seemingly insignificant details can help investigators narrow down their search significantly.

5. Phone Carrier:

In a world where smartphones are ubiquitous, a phone carrier can be a key breadcrumb. Identifying the phone carrier can lead to discovering the user's location or even their identity.

6. Exif Data:

Photographers and investigators are well aware of the importance of Exif data. This hidden treasure trove of information, embedded in image files, can reveal the camera used, GPS coordinates, and even the time and date the image was captured.

7. SMTP & Message Header Metadata:

When it comes to email investigations, examining SMTP and message header metadata can be enlightening. These headers contain information about the path an email took to reach its destination, potentially exposing the sender's IP address and intermediary servers.

8. Linguistic Slips:

In the world of online investigations, language is a powerful breadcrumb. Analyzing linguistic patterns, grammatical errors, or unique vocabulary used in online communications can help in identifying and tracking individuals, especially when pseudonyms are used.

9. Comments in Website Code:

Hidden in the source code of websites, comments left by developers or users can be revealing. These comments might contain references to vulnerabilities, insider knowledge, or even contact details that were not meant to be public.

10. Social Media Clues:

When investigating social media accounts, consider the value of likes, check-ins, and user IDs. These seemingly mundane actions can connect individuals, track their movements, and reveal social connections that might not be evident at first glance.

11. Photos from Conventions and Conferences:

A lesser-known gold mine of information is photos taken at conventions and conferences. Attendees often share these images online, unknowingly disclosing their affiliations, whereabouts, and even the individuals they associate with.


Obscure digital breadcrumbs are often hidden in plain sight, and the keen eye of an OSINT professional can turn these breadcrumbs into gold mines of information. By paying attention to seemingly trivial details such as animal icons, server headers, and linguistic slips, investigators can unveil valuable insights that may lead to major breakthroughs in their online investigations.

These breadcrumbs are not only the domain of experts but can be harnessed by anyone willing to explore the digital world with a curious and discerning eye. So, remember, the next time you embark on an online investigation, keep an eye out for these obscure digital breadcrumbs; you might just strike gold.

And let us know if we've missed any other obscure breadcrumbs, so we can add it to the list, keeping it as a living repository of digital breadcrumbs that we can all benefit from! Simply email us at!