Update table of contents (spam proposals)

4 years ago · 2c85bb20da
1 changed files with 1 additions and 0 deletions
--- a/spam-prevention.md
+++ b/spam-prevention.md
@ -15,6 +15,7 @@ spamming attempts.
 * [Proposals](#proposals)
  * [Naive upfront payment](#naive-upfront-payment)
  * [Reverse upfront payment](#reverse-upfront-payment)
+  * [Bidirectional upfront payment](#bidirectional-upfront-payment)
  * [Web of trust HTLC hold fees](#web-of-trust-htlc-hold-fees)

 ## Description of the attack