From 0cf3552515847de170bf1cb94644b8cb69f2797b Mon Sep 17 00:00:00 2001
From: eugene <elzeigel@gmail.com>
Date: Fri, 25 Aug 2023 12:43:40 -0400
Subject: [PATCH] funding: wait for coinbase maturity before sending
 channel_ready

---
 funding/manager.go | 48 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/funding/manager.go b/funding/manager.go
index 2e27051b6..f88644f0d 100644
--- a/funding/manager.go
+++ b/funding/manager.go
@@ -8,6 +8,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/btcsuite/btcd/blockchain"
 	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/btcsuite/btcd/btcec/v2/ecdsa"
 	"github.com/btcsuite/btcd/btcec/v2/schnorr/musig2"
@@ -1286,6 +1287,53 @@ func (f *Manager) advancePendingChannelState(
 			channel.FundingOutpoint, err)
 	}
 
+	if blockchain.IsCoinBaseTx(confChannel.fundingTx) {
+		// If it's a coinbase transaction, we need to wait for it to
+		// mature. We wait out an additional MinAcceptDepth on top of
+		// the coinbase maturity as an extra margin of safety.
+		maturity := f.cfg.Wallet.Cfg.NetParams.CoinbaseMaturity
+		numCoinbaseConfs := uint32(maturity)
+
+		if channel.NumConfsRequired > maturity {
+			numCoinbaseConfs = uint32(channel.NumConfsRequired)
+		}
+
+		txid := &channel.FundingOutpoint.Hash
+		fundingScript, err := makeFundingScript(channel)
+		if err != nil {
+			log.Errorf("unable to create funding script for "+
+				"ChannelPoint(%v): %v",
+				channel.FundingOutpoint, err)
+
+			return err
+		}
+
+		confNtfn, err := f.cfg.Notifier.RegisterConfirmationsNtfn(
+			txid, fundingScript, numCoinbaseConfs,
+			channel.BroadcastHeight(),
+		)
+		if err != nil {
+			log.Errorf("Unable to register for confirmation of "+
+				"ChannelPoint(%v): %v",
+				channel.FundingOutpoint, err)
+
+			return err
+		}
+
+		select {
+		case _, ok := <-confNtfn.Confirmed:
+			if !ok {
+				return fmt.Errorf("ChainNotifier shutting "+
+					"down, can't complete funding flow "+
+					"for ChannelPoint(%v)",
+					channel.FundingOutpoint)
+			}
+
+		case <-f.quit:
+			return ErrFundingManagerShuttingDown
+		}
+	}
+
 	// Success, funding transaction was confirmed.
 	chanID := lnwire.NewChanIDFromOutPoint(&channel.FundingOutpoint)
 	log.Debugf("ChannelID(%v) is now fully confirmed! "+