feat: add vuln reproduction and detection scripts

backend/script/mine_blocks.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+# mine_blocks.sh — Mine N blocks on the custom Signet
+set -euo pipefail
+
+N="${1:-1}"
+source "$HOME/.bitcoin/signet_keys.env"
+
+MINER="/home/renato/Desktop/bitcoin/bitcoin/contrib/signet/miner"
+GRIND="bitcoin-util grind"
+CLI="bitcoin-cli -signet"
+
+CURRENT=$($CLI getblockcount)
+TARGET=$((CURRENT + N))
+echo "Mining $N blocks (from $CURRENT to $TARGET)..."
+
+BLOCK_TIME=$(date +%s)
+for i in $(seq 1 $N); do
+    BLOCK_TIME=$((BLOCK_TIME + 1))
+    $MINER \
+      --cli="bitcoin-cli -rpcwallet=miner" \
+      generate \
+      --grind-cmd="$GRIND" \
+      --address="$MINER_ADDR" \
+      --min-nbits \
+      --set-block-time="$BLOCK_TIME" \
+      2>&1 >/dev/null
+done
+echo "Done. Block height: $($CLI getblockcount)"