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Reference.org
Linked timestamping
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<p>Linked timestamping is a type of <a href="/facts/Trusted_timestamping/eRjuYGTM">trusted timestamping</a> where issued time-stamps are related to each other. Each time-stamp would contain data that authenticates the time-stamp before it, the authentication would be authenticating the entire message, including the previous time-stamps authentication, making a chain. This makes it impossible to add a time-stamp in to the middle of the chain, as any time-stamps afterwards would be different. </p>