ch-11: tighten up verification, mention checking UTXO size w/ chan amt

11_gossip_channel_graph.asciidoc

@@ -412,9 +412,9 @@ First, the verifier will use the short channel ID to find which Bitcoin block co
 
 Next, the verifier uses the transaction index number to identify the transaction ID of the transaction containing the payment channel. Most modern Bitcoin libraries will allow indexing into the transaction of a block based on the index of the transaction within the greater block. 
 
-Next, the verifier requests the raw transaction from a Bitcoin node, by reference to the transaction ID. The verifier will validate the transaction (checking that it is properly signed and produces the same transaction ID when hashed).
+Next, uses a Bitcoin library (in the verifier's language) to extract the relevant transaction according to its index within the block. The verifier will validate the transaction (checking that it is properly signed and produces the same transaction ID when hashed).
 
-Next, the verifier will extract the Pay-to-Witness-Script-Hash output referenced by the output index number of the short channel ID. This is the address of the channel funding output.
+Next, the verifier will extract the Pay-to-Witness-Script-Hash output referenced by the output index number of the short channel ID. This is the address of the channel funding output. Additionally, the verified will ensure that the size of the allegd channel matches the value of the output produced at the specified output index.
 
 Finally, the verifier will reconstruct the multisig script from +bitcoin_key_1+ and +bitcoin_key_2+ and confirm that it produces the same address as in the output.