[#IsBIP30Unspendable]
= IsBIP30Unspendable
:mrdocs:

Identifies blocks which coinbase output was subsequently overwritten in the UTXO set (see BIP30).

== Synopsis

Declared in `<validation.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
IsBIP30Unspendable(
    xref:uint256.adoc[uint256] const& block_hash,
    int block_height);
----

== Return Value

true if the block's coinbase output is unspendable under BIP30.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block_hash*
| Hash of the block being checked.
| *block_height*
| Height of the block being checked.
|===


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