add pdf command, show block time in verify command

cmd/ots/verify.go

@@ -2,8 +2,10 @@ package main
 
 import (
 	"crypto/sha256"
+	"fmt"
 	"log/slog"
 	"os"
+	"strings"
 	"time"
 
 	"git.intruders.space/public/opentimestamps"
@@ -137,8 +139,21 @@ func runVerifyCmd(cmd *cobra.Command, args []string) {
 		}
 
 		att := seq.GetAttestation()
+
+		// Get the block time
+		blockHash, err := bitcoin.GetBlockHash(int64(att.BitcoinBlockHeight))
+		blockTime := ""
+		if err == nil {
+			blockHeader, err := bitcoin.GetBlockHeader(blockHash)
+			if err == nil {
+				// Format the block time
+				blockTime = fmt.Sprintf(" (%s)", blockHeader.Timestamp.Format(time.RFC3339))
+			}
+		}
+
 		slog.Info("Verification successful",
-			"block_height", att.BitcoinBlockHeight)
+			"block_height", att.BitcoinBlockHeight,
+			"block_time", strings.TrimPrefix(blockTime, " "))
 
 		if tx != nil {
 			slog.Info("Bitcoin transaction", "txid", tx.TxHash().String())