diff --git a/ch01.asciidoc b/ch01.asciidoc
index aad4a105a168f..c49488694c4b8 100644
--- a/ch01.asciidoc
+++ b/ch01.asciidoc
@@ -18,7 +18,10 @@ Due to the use of onion routing, which is also used in Tor, even the nodes that
 // The following is working draft and suggested mail stones in the history of the Lightning Network.
 
 * Satoshis nSequence number
-* unidirectional payment channels  (Jeremy Spilman 2013 - https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2013-April/002433.html)
+* unidirectional payment channels  
+** http://web.archive.org/web/20190419103457/https://bitcointalk.org/index.php?topic=91732.0[bitcoin talk discussion]. 
+** 2012 http://web.archive.org/web/20190730234737/http://gavintech.blogspot.com/web/20150510204329/http://gavintech.blogspot.com/2012/07/off-chain-transactions.html[[Blogpost by Gavin Andresen]]
+** (Mike Hearn, Jeremy Spilman 2013 - http://web.archive.org/web/20190501234757/https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2013-April/002433.html
 * Multiple white papers (Joseph Poon, Thaddeus Dryja - https://lightning.network/lightning-network-paper.pdf / Christian Decker, Roger Wattenhoffer -  https://tik-old.ee.ethz.ch/file/716b955c130e6c703fac336ea17b1670/duplex-micropayment-channels.pdf)
 * Milan meeting and creation of BOLTs
 * segwit activation