// We assume we have a namada_impl object that is already initialized
 
let bond_tx_builder = namada_impl
            
            .new_bond(validator_address.clone(), amount)
            .source(source_address.clone())
            .signing_keys(vec![source_public_key]);
 
let (mut bond_tx, signing_data) = bond_tx_builder
    .build(&namada_iml)
    .await
    .expect("unable to build bond");
 
namada_impl
    .sign(
        &mut bond_tx,
        &bond_tx_builder.tx,
        signing_data,
        default_sign,
        (),
    )
    .await
    .expect("unable to sign reveal bond");
 
let tx = namada_iml.submit(bond_tx, &bond_tx_builder.tx).await;