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2019-12-30 17:26:16 -05:00
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 # Network-Level Validation Rules
+
+In some cases, transactions may be rejected by the network despite the fact that they successfully unlock their inputs, spend valid UTXOs, and do not conflict with other transactions.  That is, a node may receive the transaction and consider it valid, but it may choose not to relay it to its peers or reject it outright.  In particular, custom, or non-standard, transactions are often treated this way by the Bitcoin Cash network at large.  Custom transactions are defined as those which are not considered standard.
+
+## Standard Transactions
+
+Standard transactions are those that:
+
+ - Only have outputs that use [standard locking scripts](/protocol/blockchain/transaction/locking-script#Standard%20Scripts)
+ - Are below the maximum transaction size of 100,000 bytes
+ - Have a valid version number (currently only version 2 is valid)
+ - Have input scripts that only contain push operations
+ - Have input scripts with unlocking scripts below the 1650 byte maximum
+ - Have at most one data (OP_RETURN) output
+ - Have non-data outputs with amount above the [dust](#dust) threshold
+
+Be aware, however, that these rules may vary from node-to-node as they are often configurable.  Some nodes may also accept and relay non-standard transactions.  For this reason, among others, it is always wise to send transactions to many nodes.
+
+### Dust