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sponsored-transactions

The transaction block builder can support sponsored transaction blocks by using the onlyTransactionKind flag when building the transaction block.

const txb = new TransactionBlock();

// ... add some transactions...

const kindBytes = await txb.build({ provider, onlyTransactionKind: true });

// construct a sponsored transaction from the kind bytes
const sponsoredTxb = TransactionBlock.fromKind(kindBytes);

// you can now set the sponsored transaction data that is required
sponsoredTxb.setSender(sender);
sponsoredTxb.setGasOwner(sponsor);
sponsoredTxb.setGasPayment(sponsorCoins);