Ledger Header
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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:
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
Hash256
The [SHA-512Half][] of this ledger version. This serves as a unique identifier for this ledger and all its contents.
account_hash
String
Hash256
The [SHA-512Half][] of this ledger's state tree information.
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. This value is rounded based on the close_time_resolution.
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
Hash256
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 XAH][] owned by accounts in the ledger. This omits XAH that has been destroyed by transaction fees. The actual amount of XAH in circulation is lower because some accounts are "black holes" whose keys are not known by anyone.
transaction_hash
String
Hash256
The [SHA-512Half][] of the transactions included in this ledger.
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.
closeFlags
(Omitted)
UInt8
A bit-map of flags relating to the closing of this ledger.
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.
The closeFlags field is not included in any JSON representations of a ledger, but is included in the binary representation of a ledger, and is one of the fields that determine the ledger's hash.
For ledger basics, see Ledgers.