[#wallet-CHDChain]
= xref:wallet.adoc[wallet]::CHDChain
:relfileprefix: ../
:mrdocs:

Simple HD chain data model.

== Synopsis

Declared in `<wallet/walletdb.h>`

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

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:wallet/CHDChain/2constructor.adoc[`CHDChain`]         [.small]#[constructor]#
| Constructs an HD chain initialized to the null state.
| xref:wallet/CHDChain/SetNull.adoc[`SetNull`] 
| Resets all fields to their default null state.
| xref:wallet/CHDChain/operator_eq.adoc[`operator==`] 
| Compares two HD chains for equality by seed id.
| xref:wallet/CHDChain/operator_lt.adoc[`operator<`] 
| Orders HD chains by seed id.
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:wallet/CHDChain/m_next_external_index.adoc[`m_next_external_index`] 
| Next external index in the keypool to be used. Memory only.
| xref:wallet/CHDChain/m_next_internal_index.adoc[`m_next_internal_index`] 
| Next internal index in the keypool to be used. Memory only.
| xref:wallet/CHDChain/nExternalChainCounter.adoc[`nExternalChainCounter`] 
| Counter for the next external chain child key index.
| xref:wallet/CHDChain/nInternalChainCounter.adoc[`nInternalChainCounter`] 
| Counter for the next internal chain child key index.
| xref:wallet/CHDChain/nVersion.adoc[`nVersion`] 
| Serialized version of this HD chain.
| xref:wallet/CHDChain/seed_id.adoc[`seed_id`] 
| seed hash160
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:wallet/CHDChain/CURRENT_VERSION.adoc[`CURRENT_VERSION`] 
| Version number written for new HD chains.
| xref:wallet/CHDChain/VERSION_HD_BASE.adoc[`VERSION_HD_BASE`] 
| Version number for the original HD chain format.
| xref:wallet/CHDChain/VERSION_HD_CHAIN_SPLIT.adoc[`VERSION_HD_CHAIN_SPLIT`] 
| Version number for HD chains with separate internal and external counters.
|===



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