Document duplicate txid behavior (#161)

ordinals · Feb 21, 2022 · 1fdaed5 · 1fdaed5
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@@ -35,6 +35,8 @@ Every satoshi is serially numbered, starting at 0, in the order in which it is m
 
 The ordinal numbers of transaction inputs are transferred to outputs in first-in-first-out order, according to the size and order of the transactions inputs and outputs.
 
+If a transaction is mined with the same transaction ID as outputs currently in the UTXO set, following the behavior of Bitcoin Core, the new transaction outputs displace the older UTXO set entries, destroying the ordinals contained in any unspent outputs of the first transaction.
+
 For the purposes of the assignment algorithm, the coinbase transaction is considered to have an implicit input equal in size to the subsidy, followed by an input for every fee-paying transaction in the block, in the order that those transactions appear in the block. The implicit subsidy input carries the block's newly created ordinals. The implicit fee inputs carry the ordinals that were paid as fees in the block's transactions.
 
 Underpaying the subsidy does not change the ordinal numbers of satoshis mined in subsequent blocks. Ordinals depend only on how many satoshis could have been mined, not how many actually were.