xrpl-dev-portal/docs/references/protocol/ledger-data/ledger-header.md

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ledger-header.html	ledger-data-formats.html	description A unique header that describes the contents of a ledger version.	Data Retention Blockchain

Ledger Header

[Source]

Every ledger version has a unique header that describes the contents. You can look up a ledger's header information with the [ledger method][]. The contents of the ledger header are as follows:

Field	JSON Type	[Internal Type][]	Description
ledger_index	String	UInt32	The [ledger index][Ledger Index] of the ledger. Some API methods display this as a quoted integer; some display it as a native JSON number.
ledger_hash	String	UInt256	The [SHA-512Half][] of this ledger version. This serves as a unique identifier for this ledger and all its contents.
account_hash	String	UInt256	The [SHA-512Half][] of this ledger's state tree information.
close_flags	Number	UInt8	A bit-map of flags relating to the closing of this ledger.
close_time	Number	UInt32	The approximate time this ledger version closed, as the number of seconds since the Ripple Epoch of 2000-01-01 00:00:00 UTC. This value is rounded based on the close_time_resolution.
close_time_resolution	Number	Uint8	An integer in the range [2,120] indicating the maximum number of seconds by which the close_time could be rounded.
closed	Boolean	Boolean	If true, this ledger version is no longer accepting new transactions. (However, unless this ledger version is validated, it might be replaced by a different ledger version with a different set of transactions.)
parent_hash	String	UInt256	The ledger_hash value of the previous ledger version that is the direct predecessor of this one. If there are different versions of the previous ledger index, this indicates from which one the ledger was derived.
total_coins	String	UInt64	The total number of [drops of XRP][] owned by accounts in the ledger. This omits XRP that has been destroyed by transaction fees. The actual amount of XRP in circulation is lower because some accounts are "black holes" whose keys are not known by anyone.
transaction_hash	String	UInt256	The [SHA-512Half][] of the transactions included in this ledger.

Ledger Index

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Close Flags

The ledger has only one flag defined for closeFlags: sLCF_NoConsensusTime (value 1). If this flag is enabled, it means that validators had different close times for the ledger, but built otherwise the same ledger, so they declared consensus while "agreeing to disagree" on the close time. In this case, official close_time value of the ledger is 1 second after that of the parent ledger.

See Also

For ledger basics, see Ledgers.

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