# In order to get a Blob from Keep, you have to prove either
# [a] you have recently written it to Keep yourself, or
# In order to get a Blob from Keep, you have to prove either
# [a] you have recently written it to Keep yourself, or
if !timestamp.match /^[\da-f]+$/
raise Blob::InvalidSignatureError.new 'Timestamp is not a base16 number.'
end
if !timestamp.match /^[\da-f]+$/
raise Blob::InvalidSignatureError.new 'Timestamp is not a base16 number.'
end