[#BlockStatus]
= BlockStatus
:mrdocs:

Bit flags describing how far a block has been validated and which data is available for it.

== Synopsis

Declared in `<chain.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
enum BlockStatus : uint32_t;
----

== Members

[cols="1,4"]
|===
| Name| Description
| `BLOCK_VALID_UNKNOWN` 
| Unused.
| `BLOCK_VALID_RESERVED` 
| Reserved (was BLOCK_VALID_HEADER).
| `BLOCK_VALID_TREE` 
| All parent headers found, difficulty matches, timestamp >= median previous. Implies all parents are also at least TREE.
| `BLOCK_VALID_TRANSACTIONS` 
| Only first tx is coinbase, 2 <= coinbase input script length <= 100, transactions valid, no duplicate txids, sigops, size, merkle root. Implies all parents are at least TREE but not necessarily TRANSACTIONS.
| `BLOCK_VALID_CHAIN` 
| Outputs do not overspend inputs, no double spends, coinbase output ok, no immature coinbase spends, BIP30. Implies all previous blocks back to the genesis block or an assumeutxo snapshot block are at least VALID_CHAIN.
| `BLOCK_VALID_SCRIPTS` 
| Scripts & signatures ok. Implies all previous blocks back to the genesis block or an assumeutxo snapshot block are at least VALID_SCRIPTS.
| `BLOCK_VALID_MASK` 
| All validity bits.
| `BLOCK_HAVE_DATA` 
| full block available in blk*.dat
| `BLOCK_HAVE_UNDO` 
| undo data available in rev*.dat
| `BLOCK_HAVE_MASK` 
| combined mask of the block‐data availability flags
| `BLOCK_FAILED_VALID` 
| stage after last reached validness failed
| `BLOCK_FAILED_CHILD` 
| Unused flag that was previously set when descending from failed block
| `BLOCK_OPT_WITNESS` 
| block data in blk*.dat was received with a witness‐enforcing client
| `BLOCK_STATUS_RESERVED` 
| Unused flag that was previously set on assumeutxo snapshot blocks and their ancestors before they were validated, and unset when they were validated.
|===



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