[#CExtPubKey]
= CExtPubKey
:mrdocs:

A BIP32 extended public key: a public key plus the chain code and metadata needed for derivation.

== Synopsis

Declared in `<pubkey.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct CExtPubKey;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:CExtPubKey/Decode.adoc[`Decode`] 
| Deserialize this extended public key from the BIP32 byte encoding (without version).
| xref:CExtPubKey/DecodeWithVersion.adoc[`DecodeWithVersion`] 
| Deserialize this extended public key from the BIP32 byte encoding including the version prefix.
| xref:CExtPubKey/Derive.adoc[`Derive`] 
| Derive a BIP32 child extended public key.
| xref:CExtPubKey/Encode.adoc[`Encode`] 
| Serialize this extended public key into the BIP32 byte encoding (without version).
| xref:CExtPubKey/EncodeWithVersion.adoc[`EncodeWithVersion`] 
| Serialize this extended public key into the BIP32 byte encoding including the version prefix.
| xref:CExtPubKey/id_key_fingerprint.adoc[`id_key_fingerprint`] 
| Compute the fingerprint of this key's own public key.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:CExtPubKey/chaincode.adoc[`chaincode`] 
| Chain code accompanying the public key.
| xref:CExtPubKey/fingerprint.adoc[`fingerprint`] 
| Fingerprint of the parent key.
| xref:CExtPubKey/nChild.adoc[`nChild`] 
| Child index used to derive this key from its parent.
| xref:CExtPubKey/nDepth.adoc[`nDepth`] 
| Depth of this key in the BIP32 derivation tree.
| xref:CExtPubKey/pubkey.adoc[`pubkey`] 
| The extended public key material.
| xref:CExtPubKey/version.adoc[`version`] 
| Version bytes prefixed to the serialized extended key.
|===


== Friends

[cols="1,4"]
|===
| Name| Description
| `xref:operator_lt-0e.adoc[operator<]`
| Order two extended public keys by public key, then by chain code.
| `xref:operator_eq-012.adoc[operator==]`
| Compare two extended public keys for equality of all fields (excluding version).
|===

== Non-Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:CreateMuSig2SyntheticXpub.adoc[`CreateMuSig2SyntheticXpub`]
| Construct the BIP 328 synthetic xpub for a pubkey
| xref:DecodeExtPubKey.adoc[`DecodeExtPubKey`]
| Decode a Base58Check‐encoded extended public key.
| xref:EncodeExtPubKey.adoc[`EncodeExtPubKey`]
| Encode an extended public key in Base58Check format.
| xref:wallet/GenerateWalletDescriptor.adoc[`wallet::GenerateWalletDescriptor`]
| Builds a new wallet descriptor for the given key and output type.
|===


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