ledger_last_hash

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

Behaviour

C

• Write the 32 byte Hash to the write_ptr

Javascript

• Retrieves the hash of the last ledger.

Definition

C

int64_t ledger_last_hash (
    uint32_t write_ptr,
    uint32_t write_len
);

Javascript

function ledger_last_hash(): ErrorCode | ByteArray

Example

C

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

Javascript

const hash = ledger_last_hash()

Parameters

C

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.

Javascript

Return Code

C

Type	Description
int64_t	The number of bytes written If negative, an error: OUT_OF_BOUNDS - pointers/lengths specified outside of hook memory.

Javascript

Type	Description
number	Returns an error code if an error occurs, or an array representing the hash of the last ledger.