ch06: a -> this

ch06.asciidoc

@@ -311,7 +311,7 @@ Fee estimation algorithms calculate the appropriate fee, based on capacity and t
 ((("static fees")))((("fees", "static fees")))Static fees are no longer viable on the bitcoin network. Wallets that set static fees will produce a poor user experience as transactions will often get "stuck" and remain unconfirmed. Users who don't understand bitcoin transactions and fees are dismayed by "stuck" transactions because they think they've lost their money.
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-The chart in <<bitcoinfeesearncom>> shows the real-time estimate of fees in 10 satoshi/byte increments and the expected confirmation time (in minutes and number of blocks) for transactions with fees in each range. For each fee range (e.g., 61&#x2013;70 satoshi/byte), two horizontal bars show the number of unconfirmed transactions (1405) and total number of transactions in the past 24 hours (102,975), with fees in that range. Based on the graph, the recommended high-priority fee at this time was 80 satoshi/byte, a fee likely to result in the transaction being mined in the very next block (zero block delay). For perspective, the median transaction size is 226 bytes, so the recommended fee for a transaction size would be 18,080 satoshis (0.00018080 BTC).
+The chart in <<bitcoinfeesearncom>> shows the real-time estimate of fees in 10 satoshi/byte increments and the expected confirmation time (in minutes and number of blocks) for transactions with fees in each range. For each fee range (e.g., 61&#x2013;70 satoshi/byte), two horizontal bars show the number of unconfirmed transactions (1405) and total number of transactions in the past 24 hours (102,975), with fees in that range. Based on the graph, the recommended high-priority fee at this time was 80 satoshi/byte, a fee likely to result in the transaction being mined in the very next block (zero block delay). For perspective, the median transaction size is 226 bytes, so the recommended fee for this transaction size would be 18,080 satoshis (0.00018080 BTC).
 
 The fee estimation data can be retrieved via a simple HTTP REST API, at https://bitcoinfees.earn.com/api/v1/fees/recommended[https://bitcoinfees.earn.com/api/v1/fees/recommended]. For example, on the command line using the +curl+ command: