[#BaseSignatureChecker]
= BaseSignatureChecker
:mrdocs:

Interface for verifying signatures and time locks encountered during script evaluation.

== Synopsis

Declared in `<script/interpreter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class BaseSignatureChecker;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BaseSignatureChecker/2destructor.adoc[`~BaseSignatureChecker`] [.small]#[destructor]# [.small]#[virtual]#
| Virtual destructor for safe polymorphic deletion.
| xref:BaseSignatureChecker/CheckECDSASignature.adoc[`CheckECDSASignature`]  [.small]#[virtual]#
| Verify an ECDSA signature against a public key and script code.
| xref:BaseSignatureChecker/CheckLockTime.adoc[`CheckLockTime`]  [.small]#[virtual]#
| Check an absolute lock time (CHECKLOCKTIMEVERIFY) against the spending transaction.
| xref:BaseSignatureChecker/CheckSchnorrSignature.adoc[`CheckSchnorrSignature`]  [.small]#[virtual]#
| Verify a BIP340 Schnorr signature for Taproot spends.
| xref:BaseSignatureChecker/CheckSequence.adoc[`CheckSequence`]  [.small]#[virtual]#
| Check a relative lock time (CHECKSEQUENCEVERIFY) against the spending input.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:DeferringSignatureChecker.adoc[`DeferringSignatureChecker`] 
| Signature checker that forwards every check to a wrapped checker.
| xref:GenericTransactionSignatureChecker-03.adoc[`GenericTransactionSignatureChecker`] 
| Signature checker that validates against a concrete spending transaction.
|===


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