We examine the possibility of device-independent relativistic quantum bitcommitment. We note the potential threat of {\it location attacks}, in whichthe behaviour of untrusted devices used in relativistic quantum cryptographydepends on their space-time location. We describe relativistic quantum bitcommitment schemes that are immune to these attacks, and show that theseschemes offer device-independent security against hypothetical post-quantumadversaries subject only to the no-signalling principle. We compare arelativistic classical bit commitment scheme with similar features, and notesome possible advantages of the quantum schemes.
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