These docs are for v2.0. Click to read the latest docs for v3.0.

Retreive the 32 byte namespace biased SHA512H of the last closed ledger

Behaviour

  • Write the 32 byte Hash to the write_ptr

Definition

int64_t ledger_last_hash (
    uint32_t write_ptr,
    uint32_t write_len
);

Example

uint8_t hash[32];
int64_t bytes_written = 
    ledger_last_hash(hash, 32);

Parameters

NameTypeDescription
write_ptruint32_tPointer to a buffer of a suitable size to store the output. Should be at least 32 bytes.
write_lenuint32_tLength of the output buffer.

Return Code

TypeDescription
int64_tThe number of bytes written

If negative, an error:
OUT_OF_BOUNDS
- pointers/lengths specified outside of hook memory.