diff --git a/ch12.asciidoc b/ch12.asciidoc
index 43d0b7db..e63067cb 100644
--- a/ch12.asciidoc
+++ b/ch12.asciidoc
@@ -117,9 +117,7 @@ As an example, I created and issued a MasterBTC asset using colored coins. The M
 
 For this particular example, I used the wallet and explorer at http://coinprism.info/[https://coinprism.info], which uses the Open Assets colored coin protocol.
 
-<<the_issuance_transaction_as_viewed_on_coinprismio>> shows the issuance transaction using the Coinprism block explorer:
-
-https://www.coinprism.info/tx/10d7c4e022f35288779be6713471151ede967caaa39eecd35296aa36d9c109ec[https://www.coinprism.info/tx/10d7c4e022f35288779be6713471151ede967caaa39eecd35296aa36d9c109ec]
+<<the_issuance_transaction_as_viewed_on_coinprismio>> shows the issuance transaction using the https://www.coinprism.info/tx/10d7c4e022f35288779be6713471151ede967caaa39eecd35296aa36d9c109ec[Coinprism block explorer].
 
 [[the_issuance_transaction_as_viewed_on_coinprismio]]
 .The issuance transaction as viewed on coinprism.info