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If it starts M, its almost certainly ASN.1 DER starting with a SEQUENCE. If it starts MI its probably an X.509 certificate (its a biig sequence).

LS0t is the base64 encoding of --- which is the start of a PEM block. It’ll probably be followed by LS(something) because there are five dashes to a PEM block.

dW5kZWZpbmVkCg== is just undefined and that one is in my brain as the result of an append only database, a buggy JavaScript frontend and a backend with insufficient validation at a previous job…