SSB Log Entry 161

bamboo is such a cool project! I was very excited to find it last night. Great work!

I had a question after reading the README.md file: Why does a #bamboo message have a backlink and a lipmaalink property? Would it be insecure / inconvenient to only provide the lipmaalink? Since the lipmaalink is deterministic, wouldn't knowing the current message's sequence number (n) be enough to perform verification and prevent tampering (eg: prevSequence = lipmaa_iterative(MY_SEQUENCE_NUMBER))?