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.to(dummyAddress, 0) .fee(req.body.fee) .change(from) .addData(`${messagePrefix}${req.body.message}`) .sign(req.account.privateKeyWIF); broadcast(transaction.uncheckedSerialize()).then(body => { if(req.webtaskContext.secrets.debug) { res.json({ status: 'Message sent!', transactionId: body, transaction: transaction.toString(), dummyPrivateKeyWIF: dummyPrivateKey.toWIF() }); } else { res.json({ status: 'Message sent!', transactionId: body }); } }, error => { res.status(500).send(error.toString()); }); }, error => { res.status(500).send(error.toString()); }); The code is fairly simple: 1. Gets the unspent transactions for an address (i.e. the coins available, the balance). 2. Build a new transaction using the unspent transactions as input. 3. Point the transaction to a new, empty address. Assign 0 coins to that address (do not send money unnecessarily). 4. Set the fee. 5. Set the address where the unspent money will get sent back (the change address). 6. Add our message. 7. Broadcast the transaction. Bitcoin requires transactions to be constructed using the money from previous transactions. That is, when coins are sent, it is not the origin address that is specified, rather it is the transactions pointing to that address that are included in a new transaction that points to a different destination address. From these transactions is subtracted the money that is then sent to the destination. In our case, we use these transactions to pay for the fee. Everything else gets sent back to our address. 23PDF Image | Intro to Ethereum and Smart Contracts
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