Function token_burn_from_pool_extra_sighash_data_v0 

pub fn token_burn_from_pool_extra_sighash_data_v0(
    token_id: &[u8; 32],
    burner_id: &[u8; 32],
    amount: u64,
) -> Vec<u8> 

Version 0 layout: token_id (32) || burner_id (32) || amount (8, little endian).