func newBlock(prev coin.Block, currentTime uint64, unspent coin.UnspentPool,
txns coin.Transactions, calc coin.FeeCalculator) coin.Block {
if len(txns) == 0 {
log.Panic("Refusing to create block with no transactions")
}
fee, err := txns.Fees(calc)
if err != nil {
// This should have been caught earlier
log.Panicf("Invalid transaction fees: %v", err)
}
body := coin.BlockBody{txns}
return coin.Block{
Head: newBlockHeader(prev.Head, unspent, currentTime, fee, body),
Body: body,
}
}
