1 files changed, 6 insertions, 0 deletions

diff --git a/src/main.h b/src/main.h
index 22be3dc..6b1ff0a 100644
--- a/src/main.h
+++ b/src/main.h
@@ -41,6 +41,12 @@ static const int64 MAX_MONEY = 21000000 * COIN;
 inline bool MoneyRange(int64 nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }
 static const int64 CENT = 1000000;
 static const int COINBASE_MATURITY = 100;
+// Depth at which a coinbase we mined is actually usable. CMerkleTx::GetCredit
+// values a coinbase at zero until GetBlocksToMaturity() reaches 0, which is
+// this depth -- not COINBASE_MATURITY. Anything that plans to *spend* mined
+// coin must gate on this, or it will try to pay out of a balance the wallet
+// still reports as zero. Both rules live here so they cannot drift apart.
+static const int COINBASE_SPENDABLE_DEPTH = COINBASE_MATURITY + 20;
 
 // Bitflash difficulty floor. The PoW is RandomX (memory-hard), ~1000x slower
 // per hash than SHA-256d, so the target is much easier than Bitcoin's to let a