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validation: Add minimum witness commitment size constant

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Per BIP 141, the witness commitment structure is atleast 38 bytes,
OP_RETURN (0x6a) + 36 (0x24) + 4 byte header (0xaa21a9ed) + 32 byte
SHA256 hash. It can be longer, however any additional data has no
consensus meaning.
This commit is contained in:
fanquake
2020-04-26 20:01:46 +08:00
parent ba348dbc51
commit 06442549f8
2 changed files with 11 additions and 2 deletions
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2
src/validation.h
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@@ -92,6 +92,8 @@ static const unsigned int DEFAULT_CHECKLEVEL = 3;
// one 128MB block file + added 15% undo data = 147MB greater for a total of 545MB
// Setting the target to >= 550 MiB will make it likely we can respect the target.
static const uint64_t MIN_DISK_SPACE_FOR_BLOCK_FILES = 550 * 1024 * 1024;
/** Minimum size of a witness commitment structure. Defined in BIP 141. **/
static constexpr size_t MINIMUM_WITNESS_COMMITMENT{38};
struct BlockHasher
{