Broadcasting transaction with multiple recipients using BDK-Kotlin

A quick guide on how to use the BDK-Kotlin 0.7.0 library to create a send transaction with multiple recipients. You can use the Padawan Wallet and dev-kit open-source projects as reference.

TxBuilder

With the TxBuilder() you can create the transaciton as per usual.

var txBuilder = TxBuilder()
for (recipient in recipientList) {
	txBuilder = txBuilder.addRecipient(address = recipient.first, amount = recipient.second)
}
txBuilder = txBuilder.feeRate(satPerVbyte = feeRate)
return txBuilder.finish(wallet)

You can write this piece of logic however you want, but to give an example of using scopes to read the recipientList data :

val psbt = recipientList.fold(TxBuilder()) { builder, recipient ->
    builder.addRecipient(recipient.address, recipient.amount)
}.finish(wallet)

Sign & Broadcast

After you have the PSBT object you can do whatever you want with it! Sign and broadcast with the Wallet and Blockchain object to send out the transaction.