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Star Wars: The Bad Batch Shows the Origin of The Mandalorian's Chain Codes
The Star Wars Underworld - #QOTD: “I want you to take a look at something. My chain code has been encoded in this armor for 25 years. You see, this is me.
star wars - What is a chain code and how do they work? - Science Fiction & Fantasy Stack Exchange
Explained: What are chain codes in the Star Wars universe?