Edited appendix-bitcoin-fundamentals-review.asciidoc with Atlas code …

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jacobburrell · Nov 19, 2021 · e6c9cc2 · e6c9cc2
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@@ -192,16 +192,17 @@ While the transactions created by the Lightning Network have multiple outputs, t
 
 ((("Bitcoin transactions","transaction chains")))((("transaction chains")))Every output can be spent as an input in a subsequent transaction. So, for example, if Bob decided to spend 10,000 satoshi in a transaction paying Chan, and Chan spent 4,000 satoshi to pay Dina, it would play out as shown in <<tx_chain>>.
 
-[[tx_chain]]
-.Alice pays Bob who pays Chan who pays Dina
-image::images/mtln_aa06.png["Alice pays Bob who pays Chan who pays Dina"]
-
 An output is considered _spent_ if it is referenced as an input in another transaction that is recorded on the blockchain. An output is considered _unspent_ (and available for spending) if no recorded transaction references it.
 
 The only type of transaction that doesn't have inputs is a special transaction created by Bitcoin miners called the _coinbase transaction_. The coinbase transaction has only outputs and no inputs because it creates new bitcoin from mining. Every other transaction spends one or more previously recorded outputs as its inputs.
 
 Since transactions are chained, if you pick a transaction at random, you can follow any one of its inputs backward to the previous transaction that created it. If you keep doing that, you will eventually reach a coinbase transaction where the bitcoin was first mined.
 
+[[tx_chain]]
+.Alice pays Bob who pays Chan who pays Dina
+image::images/mtln_aa06.png["Alice pays Bob who pays Chan who pays Dina"]
+
+
 ==== TxID: Transaction Identifiers
 
 ((("Bitcoin transactions","transaction identifiers")))((("TxID (transaction identifiers)")))Every transaction in the Bitcoin system is identified by a unique identifier (assuming the existence of BIP-0030), called the _transaction ID_ or _TxID_ for short. To produce a unique identifier, we use the SHA-256 cryptographic hash function to produce a hash of the transaction's data. This "fingerprint" serves as a universal identifier. A transaction can be referenced by its transaction ID, and once a transaction is recorded on the Bitcoin blockchain, every node in the Bitcoin network knows that this transaction is valid.