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

Name

Type

Description

write_ptr

uint32_t

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

write_len

uint32_t

Length of the output buffer.

Return Code

Type

Description

int64_t

The number of bytes written

If negative, an error:
OUT_OF_BOUNDS

  • pointers/lengths specified outside of hook memory.