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PR #112 added a second parameter, namely String reference, to GetTransactionsToApproveResponse.

This parameter can also be set in sendTrytes. The Javadoc there says

Hash of transaction to start random-walk from, used to make sure the tips returned reference a given transaction in their past.

When and why would I set this parameter, instead of leaving it null?

/**
 * Facade method: Gets transactions to approve, attaches to Tangle, broadcasts and stores.
 *
 * @param trytes             The trytes.
 * @param depth              The depth.
 * @param minWeightMagnitude The minimum weight magnitude.
 * @param reference          Hash of transaction to start random-walk from, used to make sure the tips returned reference a given transaction in their past.
 * @return Transactions objects.
 * @throws ArgumentException is thrown when invalid trytes is provided.
 */
public List<Transaction> sendTrytes(final String[] trytes, final int depth, final int minWeightMagnitude, final String reference) throws ArgumentException;
mike
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    I can think of two reasons: 1) when you want to promote another transaction with your transaction/bundle. 2) when you try to spend a balance you received but which was not confirmed, to make sure that other transaction confirms too before/when your transaction confirms. – mihi Oct 11 '18 at 18:29
  • Thx. To 1: What does 'promote' mean in this context. To 2: Okay, understood. This translates to payments within sub-tangles. – mike Oct 12 '18 at 09:22
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    Promote = reference an old transaction by a more recent one to increase the chance of it (or more precisely, both of them) getting confirmed by the coordinator. – mihi Oct 12 '18 at 19:10

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