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Generate a 32 byte nonce for use in an emitted transaction

Concepts

Behaviour

  • Write the 32 byte Hash to the write_ptr

Definition

int64_t etxn_nonce (
    uint32_t write_ptr,
    uint32_t write_len
);

Example

uint8_t n[32];
int64_t bytes_written = 
    etxn_nonce(n, 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.