refactor

2025-04-11 13:31:02 +02:00
parent ba1196a962
commit 03f30f1968
48 changed files with 1685 additions and 474 deletions
--- a/cmd/example/main.go
+++ b/cmd/example/main.go
@@ -0,0 +1,158 @@
+package main
+
+import (
+	"context"
+	"crypto/sha256"
+	"fmt"
+	"os"
+	"time"
+
+	"git.intruders.space/public/opentimestamps"
+	"git.intruders.space/public/opentimestamps/ots"
+)
+
+func main() {
+	// Read a file to timestamp
+	fileData, err := os.ReadFile("document.txt")
+	if err != nil {
+		fmt.Println("Error reading file:", err)
+		return
+	}
+
+	// Calculate the digest
+	digest := sha256.Sum256(fileData)
+	fmt.Printf("File digest: %x\n", digest)
+
+	// Define calendar servers
+	calendars := []string{
+		"https://alice.btc.calendar.opentimestamps.org",
+		"https://bob.btc.calendar.opentimestamps.org",
+		"https://finney.calendar.eternitywall.com",
+	}
+
+	// Create a timestamp using each calendar
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	var sequences []ots.Sequence
+	for _, calendarURL := range calendars {
+		fmt.Printf("Submitting to %s...\n", calendarURL)
+		seq, err := opentimestamps.Stamp(ctx, calendarURL, digest)
+		if err != nil {
+			fmt.Printf("Failed to submit to %s: %v\n", calendarURL, err)
+			continue
+		}
+		fmt.Printf("Submission to %s successful\n", calendarURL)
+		sequences = append(sequences, seq)
+	}
+
+	if len(sequences) == 0 {
+		fmt.Println("Failed to create any timestamps")
+		return
+	}
+
+	// Create the timestamp file
+	file := &ots.File{
+		Digest:    digest[:],
+		Sequences: sequences,
+	}
+
+	// Save the OTS file
+	otsData := file.SerializeToFile()
+	if err := os.WriteFile("document.txt.ots", otsData, 0644); err != nil {
+		fmt.Println("Failed to save OTS file:", err)
+		return
+	}
+	fmt.Println("Timestamp file created successfully")
+
+	// Display initial timestamp info
+	fmt.Println("\nInitial timestamp info:")
+	fmt.Println(file.Human(false))
+
+	// Attempt to upgrade the timestamp every 20 minutes
+	fmt.Println("\nWill check for upgrades every 20 minutes...")
+
+	maxAttempts := 12 // Try for about 4 hours (12 * 20 minutes)
+	for attempt := 0; attempt < maxAttempts; attempt++ {
+		if attempt > 0 {
+			fmt.Printf("\nWaiting 20 minutes before next upgrade attempt (%d/%d)...\n", attempt+1, maxAttempts)
+			time.Sleep(20 * time.Minute)
+		}
+
+		upgraded := false
+		pendingSequences := file.GetPendingSequences()
+		if len(pendingSequences) == 0 {
+			fmt.Println("No pending sequences to upgrade")
+			break
+		}
+
+		fmt.Printf("Attempting to upgrade %d pending sequences...\n", len(pendingSequences))
+
+		upgradeCtx, upgradeCancel := context.WithTimeout(context.Background(), 30*time.Second)
+		for _, seq := range pendingSequences {
+			att := seq.GetAttestation()
+			fmt.Printf("Trying to upgrade sequence from %s...\n", att.CalendarServerURL)
+
+			upgradedSeq, err := opentimestamps.UpgradeSequence(upgradeCtx, seq, digest[:])
+			if err != nil {
+				fmt.Printf("Failed to upgrade sequence from %s: %v\n", att.CalendarServerURL, err)
+				continue
+			}
+
+			// Replace the sequence in the file
+			for i, origSeq := range file.Sequences {
+				origAtt := origSeq.GetAttestation()
+				if origAtt.CalendarServerURL == att.CalendarServerURL {
+					file.Sequences[i] = upgradedSeq
+					upgraded = true
+
+					newAtt := upgradedSeq.GetAttestation()
+					if newAtt.BitcoinBlockHeight > 0 {
+						fmt.Printf("Sequence upgraded! Confirmed in Bitcoin block %d\n", newAtt.BitcoinBlockHeight)
+					} else {
+						fmt.Println("Sequence updated but still pending")
+					}
+					break
+				}
+			}
+		}
+		upgradeCancel()
+
+		if upgraded {
+			// Save the upgraded file
+			otsData = file.SerializeToFile()
+			if err := os.WriteFile("document.txt.ots", otsData, 0644); err != nil {
+				fmt.Println("Failed to save upgraded OTS file:", err)
+			} else {
+				fmt.Println("Upgraded timestamp file saved")
+			}
+		}
+
+		// If all sequences are confirmed, we're done
+		if len(file.GetPendingSequences()) == 0 {
+			fmt.Println("All sequences are now confirmed in the Bitcoin blockchain!")
+			break
+		}
+	}
+
+	// Final report
+	fmt.Println("\nFinal timestamp status:")
+
+	confirmedSeqs := file.GetBitcoinAttestedSequences()
+	pendingSeqs := file.GetPendingSequences()
+
+	fmt.Printf("Confirmed attestations: %d\n", len(confirmedSeqs))
+	for _, seq := range confirmedSeqs {
+		att := seq.GetAttestation()
+		fmt.Printf("- Confirmed in Bitcoin block %d\n", att.BitcoinBlockHeight)
+	}
+
+	fmt.Printf("Pending attestations: %d\n", len(pendingSeqs))
+	for _, seq := range pendingSeqs {
+		att := seq.GetAttestation()
+		fmt.Printf("- Still pending at %s\n", att.CalendarServerURL)
+	}
+
+	fmt.Println("\nDetailed timestamp info:")
+	fmt.Println(file.Human(true))
+}
--- a/cmd/ots/create.go
+++ b/cmd/ots/create.go
@@ -0,0 +1,130 @@
+package main
+
+import (
+	"context"
+	"crypto/sha256"
+	"fmt"
+	"log/slog"
+	"os"
+	"strings"
+	"time"
+
+	"git.intruders.space/public/opentimestamps"
+	"git.intruders.space/public/opentimestamps/ots"
+	"github.com/spf13/cobra"
+)
+
+// Default calendar servers
+var defaultCalendars = []string{
+	"https://alice.btc.calendar.opentimestamps.org",
+	"https://bob.btc.calendar.opentimestamps.org",
+	"https://finney.calendar.eternitywall.com",
+}
+
+var (
+	// Create command flags
+	createOutput       string
+	createCalendarsStr string
+	createTimeout      time.Duration
+)
+
+// createCmd represents the create command
+var createCmd = &cobra.Command{
+	Use:   "create [flags] <file>",
+	Short: "Create a timestamp for a file",
+	Long: `Create a timestamp for a file by submitting its digest to OpenTimestamps calendar servers.
+The resulting timestamp is saved to a .ots file, which can later be verified or upgraded.`,
+	Args: cobra.ExactArgs(1),
+	Run:  runCreateCmd,
+}
+
+func init() {
+	// Local flags for the create command
+	createCmd.Flags().StringVarP(&createOutput, "output", "o", "", "Output filename (default: input filename with .ots extension)")
+	createCmd.Flags().StringVar(&createCalendarsStr, "calendar", strings.Join(defaultCalendars, ","), "Comma-separated list of calendar server URLs")
+	createCmd.Flags().DurationVar(&createTimeout, "timeout", 30*time.Second, "Timeout for calendar server connections")
+}
+
+func runCreateCmd(cmd *cobra.Command, args []string) {
+	inputPath := args[0]
+
+	// Determine output file path
+	outputPath := createOutput
+	if outputPath == "" {
+		outputPath = inputPath + ".ots"
+	}
+
+	// Parse calendar servers
+	calendars := strings.Split(createCalendarsStr, ",")
+	if len(calendars) == 0 {
+		calendars = defaultCalendars
+	}
+
+	// Read the input file
+	fileData, err := os.ReadFile(inputPath)
+	if err != nil {
+		slog.Error("Failed to read input file", "file", inputPath, "error", err)
+		os.Exit(1)
+	}
+
+	// Compute the file digest
+	digest := sha256.Sum256(fileData)
+	slog.Info("Computed file digest", "digest", fmt.Sprintf("%x", digest))
+
+	// Create context with timeout
+	ctx, cancel := context.WithTimeout(context.Background(), createTimeout)
+	defer cancel()
+
+	// Create timestamps using all calendar servers
+	var sequences []ots.Sequence
+	var errors []string
+
+	for _, calendarURL := range calendars {
+		calendarURL = strings.TrimSpace(calendarURL)
+		if calendarURL == "" {
+			continue
+		}
+
+		slog.Info("Submitting to calendar", "url", calendarURL)
+		seq, err := opentimestamps.Stamp(ctx, calendarURL, digest)
+		if err != nil {
+			slog.Warn("Calendar submission failed", "url", calendarURL, "error", err)
+			errors = append(errors, fmt.Sprintf("%s: %v", calendarURL, err))
+			continue
+		}
+
+		sequences = append(sequences, seq)
+		slog.Info("Calendar submission successful", "url", calendarURL)
+	}
+
+	if len(sequences) == 0 {
+		slog.Error("All calendar submissions failed", "errors", errors)
+		os.Exit(1)
+	}
+
+	// Create the timestamp file
+	file := &ots.File{
+		Digest:    digest[:],
+		Sequences: sequences,
+	}
+
+	// Write the OTS file
+	otsData := file.SerializeToFile()
+	err = os.WriteFile(outputPath, otsData, 0644)
+	if err != nil {
+		slog.Error("Failed to write OTS file", "file", outputPath, "error", err)
+		os.Exit(1)
+	}
+
+	slog.Info("Timestamp file created successfully",
+		"file", outputPath,
+		"timestamps", len(sequences),
+		"size", len(otsData))
+
+	// Print human-readable representation
+	slog.Debug("Timestamp details", "info", file.Human(false))
+
+	slog.Info("Timestamp creation complete",
+		"status", "pending",
+		"note", "Use 'ots upgrade' to upgrade this timestamp when it's confirmed in the Bitcoin blockchain")
+}
--- a/cmd/ots/info.go
+++ b/cmd/ots/info.go
@@ -0,0 +1,108 @@
+package main
+
+import (
+	"encoding/hex"
+	"fmt"
+	"log/slog"
+	"os"
+	"strings"
+
+	"git.intruders.space/public/opentimestamps"
+	"git.intruders.space/public/opentimestamps/ots"
+	"github.com/spf13/cobra"
+)
+
+// infoCmd represents the info command
+var infoCmd = &cobra.Command{
+	Use:   "info [flags] <file.ots>",
+	Short: "Display information about a timestamp",
+	Long: `Display detailed information about a timestamp file in human-readable format.
+Shows the file digest and the sequence of operations and attestations.`,
+	Args: cobra.ExactArgs(1),
+	Run:  runInfoCmd,
+}
+
+func init() {
+	// No specific flags needed for info command
+}
+
+func runInfoCmd(cmd *cobra.Command, args []string) {
+	otsPath := args[0]
+
+	// Read and parse the OTS file
+	otsData, err := os.ReadFile(otsPath)
+	if err != nil {
+		slog.Error("Failed to read OTS file", "file", otsPath, "error", err)
+		os.Exit(1)
+	}
+
+	timestampFile, err := opentimestamps.ReadFromFile(otsData)
+	if err != nil {
+		slog.Error("Failed to parse OTS file", "file", otsPath, "error", err)
+		os.Exit(1)
+	}
+
+	// Print the timestamp information in the requested format
+	fmt.Printf("File sha256 hash: %s\n", hex.EncodeToString(timestampFile.Digest))
+	fmt.Println("Timestamp:")
+
+	// Format and print each sequence
+	for i, seq := range timestampFile.Sequences {
+		if i > 0 {
+			// Add a separator between sequences if needed
+			fmt.Println()
+		}
+		printSequenceInfo(seq, 0, timestampFile.Digest)
+	}
+}
+
+func printSequenceInfo(seq ots.Sequence, depth int, initialDigest []byte) {
+	prefix := strings.Repeat(" ", depth)
+
+	// Track the current result as we apply operations
+	current := initialDigest
+
+	// For the first level (depth 0), don't add the arrow
+	arrowPrefix := ""
+	if depth > 0 {
+		arrowPrefix = " -> "
+	}
+
+	for _, inst := range seq {
+		// Skip attestation for now, we'll handle it at the end
+		if inst.Attestation != nil {
+			continue
+		}
+
+		// Print operation
+		if inst.Operation != nil {
+			line := fmt.Sprintf("%s%s%s", prefix, arrowPrefix, inst.Operation.Name)
+			if inst.Operation.Binary {
+				line += fmt.Sprintf(" %s", hex.EncodeToString(inst.Argument))
+			}
+			fmt.Println(line)
+
+			// Update current result
+			current = inst.Operation.Apply(current, inst.Argument)
+
+			// Only show arrow prefix for the first line
+			arrowPrefix = ""
+		}
+	}
+
+	// Check if there's an attestation at the end
+	if len(seq) > 0 && seq[len(seq)-1].Attestation != nil {
+		att := seq[len(seq)-1].Attestation
+		var attLine string
+
+		if att.BitcoinBlockHeight > 0 {
+			attLine = fmt.Sprintf("verify BitcoinAttestation(block %d)", att.BitcoinBlockHeight)
+		} else if att.CalendarServerURL != "" {
+			attLine = fmt.Sprintf("verify PendingAttestation('%s')", att.CalendarServerURL)
+		}
+
+		if attLine != "" {
+			fmt.Printf("%s%s\n", prefix, attLine)
+		}
+	}
+}
--- a/cmd/ots/main.go
+++ b/cmd/ots/main.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	if err := rootCmd.Execute(); err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+}
--- a/cmd/ots/root.go
+++ b/cmd/ots/root.go
@@ -0,0 +1,64 @@
+package main
+
+import (
+	"log/slog"
+	"os"
+	"strings"
+
+	"github.com/spf13/cobra"
+)
+
+var (
+	// Global flags
+	jsonLog  bool
+	logLevel string
+)
+
+// rootCmd represents the base command when called without any subcommands
+var rootCmd = &cobra.Command{
+	Use:   "ots",
+	Short: "OpenTimestamps CLI tool",
+	Long: `A command-line interface for OpenTimestamps operations.
+It allows creating, verifying and upgrading timestamps for files.`,
+	PersistentPreRun: setupLogging,
+}
+
+func init() {
+	// Global flags for all commands
+	rootCmd.PersistentFlags().BoolVar(&jsonLog, "json", false, "Use JSON format for logging")
+	rootCmd.PersistentFlags().StringVar(&logLevel, "log-level", "info", "Log level: debug, info, warn, error")
+
+	// Add subcommands
+	rootCmd.AddCommand(createCmd)
+	rootCmd.AddCommand(verifyCmd)
+	rootCmd.AddCommand(upgradeCmd)
+	rootCmd.AddCommand(infoCmd)
+}
+
+// setupLogging configures the global logger based on the flags
+func setupLogging(cmd *cobra.Command, args []string) {
+	loggerOptions := slog.HandlerOptions{}
+
+	switch strings.ToLower(logLevel) {
+	case "debug":
+		loggerOptions.Level = slog.LevelDebug
+	case "info":
+		loggerOptions.Level = slog.LevelInfo
+	case "warn":
+		loggerOptions.Level = slog.LevelWarn
+	case "error":
+		loggerOptions.Level = slog.LevelError
+	default:
+		loggerOptions.Level = slog.LevelInfo
+	}
+
+	var logHandler slog.Handler
+	if jsonLog {
+		logHandler = slog.NewJSONHandler(os.Stdout, &loggerOptions)
+	} else {
+		logHandler = slog.NewTextHandler(os.Stdout, &loggerOptions)
+	}
+
+	logger := slog.New(logHandler)
+	slog.SetDefault(logger)
+}
--- a/cmd/ots/upgrade.go
+++ b/cmd/ots/upgrade.go
@@ -0,0 +1,138 @@
+package main
+
+import (
+	"context"
+	"log/slog"
+	"os"
+	"time"
+
+	"git.intruders.space/public/opentimestamps"
+	"github.com/spf13/cobra"
+)
+
+var (
+	// Upgrade command flags
+	upgradeOutput  string
+	upgradeTimeout time.Duration
+	upgradeDryRun  bool
+)
+
+// upgradeCmd represents the upgrade command
+var upgradeCmd = &cobra.Command{
+	Use:   "upgrade [flags] <file.ots>",
+	Short: "Upgrade a timestamp",
+	Long: `Upgrade a timestamp by checking if pending attestations have been confirmed in the Bitcoin blockchain.
+If confirmed, the timestamp will be updated with the Bitcoin block information.`,
+	Args: cobra.ExactArgs(1),
+	Run:  runUpgradeCmd,
+}
+
+func init() {
+	// Local flags for the upgrade command
+	upgradeCmd.Flags().StringVarP(&upgradeOutput, "output", "o", "", "Output filename (default: overwrites the input file)")
+	upgradeCmd.Flags().DurationVar(&upgradeTimeout, "timeout", 30*time.Second, "Timeout for calendar server connections")
+	upgradeCmd.Flags().BoolVar(&upgradeDryRun, "dry-run", false, "Don't write output file, just check if upgrade is possible")
+}
+
+func runUpgradeCmd(cmd *cobra.Command, args []string) {
+	inputPath := args[0]
+
+	// Determine output file path
+	outputPath := upgradeOutput
+	if outputPath == "" {
+		outputPath = inputPath
+	}
+
+	// Read and parse the OTS file
+	otsData, err := os.ReadFile(inputPath)
+	if err != nil {
+		slog.Error("Failed to read OTS file", "file", inputPath, "error", err)
+		os.Exit(1)
+	}
+
+	timestampFile, err := opentimestamps.ReadFromFile(otsData)
+	if err != nil {
+		slog.Error("Failed to parse OTS file", "file", inputPath, "error", err)
+		os.Exit(1)
+	}
+
+	// Get pending sequences to upgrade
+	pendingSequences := timestampFile.GetPendingSequences()
+	if len(pendingSequences) == 0 {
+		slog.Info("No pending timestamps found, file is already fully upgraded", "file", inputPath)
+		os.Exit(0)
+	}
+
+	slog.Info("Found pending timestamps", "count", len(pendingSequences))
+
+	// Create context with timeout
+	ctx, cancel := context.WithTimeout(context.Background(), upgradeTimeout)
+	defer cancel()
+
+	// Try to upgrade each pending sequence
+	upgradedCount := 0
+	for i, seq := range pendingSequences {
+		att := seq.GetAttestation()
+		slog.Info("Attempting to upgrade timestamp",
+			"index", i+1,
+			"calendar", att.CalendarServerURL)
+
+		upgraded, err := opentimestamps.UpgradeSequence(ctx, seq, timestampFile.Digest)
+		if err != nil {
+			slog.Warn("Upgrade failed",
+				"calendar", att.CalendarServerURL,
+				"error", err)
+			continue
+		}
+
+		// Replace the pending sequence with the upgraded one
+		for j, origSeq := range timestampFile.Sequences {
+			if origSeq[len(origSeq)-1].Attestation != nil &&
+				origSeq[len(origSeq)-1].Attestation.CalendarServerURL == att.CalendarServerURL {
+				timestampFile.Sequences[j] = upgraded
+				break
+			}
+		}
+
+		upgradedCount++
+
+		newAtt := upgraded.GetAttestation()
+		if newAtt.BitcoinBlockHeight > 0 {
+			slog.Info("Timestamp upgraded successfully",
+				"calendar", att.CalendarServerURL,
+				"block", newAtt.BitcoinBlockHeight)
+		} else {
+			slog.Info("Timestamp replaced but still pending", "calendar", att.CalendarServerURL)
+		}
+	}
+
+	if upgradedCount == 0 {
+		slog.Warn("No timestamps could be upgraded at this time. Try again later.", "file", inputPath)
+		if !upgradeDryRun {
+			os.Exit(1)
+		}
+		os.Exit(0)
+	}
+
+	// In dry run mode, don't write the file
+	if upgradeDryRun {
+		slog.Info("Dry run completed", "upgraded", upgradedCount, "total", len(pendingSequences))
+		os.Exit(0)
+	}
+
+	// Write the updated OTS file
+	newOtsData := timestampFile.SerializeToFile()
+	err = os.WriteFile(outputPath, newOtsData, 0644)
+	if err != nil {
+		slog.Error("Failed to write updated OTS file", "file", outputPath, "error", err)
+		os.Exit(1)
+	}
+
+	slog.Info("Timestamp file upgraded successfully",
+		"file", outputPath,
+		"upgraded", upgradedCount,
+		"total", len(pendingSequences))
+
+	// Print human-readable representation
+	slog.Debug("Updated timestamp details", "info", timestampFile.Human(false))
+}
--- a/cmd/ots/verify.go
+++ b/cmd/ots/verify.go
@@ -0,0 +1,155 @@
+package main
+
+import (
+	"crypto/sha256"
+	"log/slog"
+	"os"
+	"time"
+
+	"git.intruders.space/public/opentimestamps"
+	"git.intruders.space/public/opentimestamps/verifyer"
+	"github.com/btcsuite/btcd/rpcclient"
+	"github.com/spf13/cobra"
+)
+
+var (
+	// Verify command flags
+	verifyEsploraURL   string
+	verifyBitcoindHost string
+	verifyBitcoindUser string
+	verifyBitcoindPass string
+	verifyTimeout      time.Duration
+)
+
+// verifyCmd represents the verify command
+var verifyCmd = &cobra.Command{
+	Use:   "verify [flags] <file> <file.ots>",
+	Short: "Verify a timestamp",
+	Long: `Verify a timestamp against the Bitcoin blockchain.
+It computes the file digest, checks it against the timestamp,
+and verifies the timestamp against Bitcoin using either Esplora API or bitcoind.`,
+	Args: cobra.ExactArgs(2),
+	Run:  runVerifyCmd,
+}
+
+func init() {
+	// Local flags for the verify command
+	verifyCmd.Flags().StringVar(&verifyEsploraURL, "esplora", "https://blockstream.info/api", "URL of Esplora API")
+	verifyCmd.Flags().StringVar(&verifyBitcoindHost, "bitcoind", "", "Host:port of bitcoind RPC (e.g. localhost:8332)")
+	verifyCmd.Flags().StringVar(&verifyBitcoindUser, "rpcuser", "", "Bitcoin RPC username")
+	verifyCmd.Flags().StringVar(&verifyBitcoindPass, "rpcpass", "", "Bitcoin RPC password")
+	verifyCmd.Flags().DurationVar(&verifyTimeout, "timeout", 30*time.Second, "Connection timeout")
+}
+
+func runVerifyCmd(cmd *cobra.Command, args []string) {
+	filePath := args[0]
+	otsPath := args[1]
+
+	// Read the original file
+	fileData, err := os.ReadFile(filePath)
+	if err != nil {
+		slog.Error("Failed to read file", "file", filePath, "error", err)
+		os.Exit(1)
+	}
+
+	// Compute the file digest
+	digest := sha256.Sum256(fileData)
+	slog.Debug("Computed file digest", "digest", digest)
+
+	// Read and parse the OTS file
+	otsData, err := os.ReadFile(otsPath)
+	if err != nil {
+		slog.Error("Failed to read OTS file", "file", otsPath, "error", err)
+		os.Exit(1)
+	}
+
+	timestampFile, err := opentimestamps.ReadFromFile(otsData)
+	if err != nil {
+		slog.Error("Failed to parse OTS file", "file", otsPath, "error", err)
+		os.Exit(1)
+	}
+
+	// Setup Bitcoin connection
+	var bitcoin verifyer.Bitcoin
+	if verifyBitcoindHost != "" {
+		if verifyBitcoindUser == "" || verifyBitcoindPass == "" {
+			slog.Error("Bitcoind RPC credentials required with --bitcoind")
+			os.Exit(1)
+		}
+
+		// Create bitcoind connection config
+		config := rpcclient.ConnConfig{
+			Host:         verifyBitcoindHost,
+			User:         verifyBitcoindUser,
+			Pass:         verifyBitcoindPass,
+			HTTPPostMode: true,
+			DisableTLS:   true,
+		}
+
+		btc, err := verifyer.NewBitcoindInterface(config)
+		if err != nil {
+			slog.Error("Failed to connect to bitcoind", "error", err)
+			os.Exit(1)
+		}
+		bitcoin = btc
+		slog.Info("Using bitcoind", "host", verifyBitcoindHost)
+	} else {
+		// Use Esplora API
+		bitcoin = verifyer.NewEsploraClient(verifyEsploraURL, verifyTimeout)
+		slog.Info("Using Esplora API", "url", verifyEsploraURL)
+	}
+
+	// Check if digests match
+	if string(digest[:]) != string(timestampFile.Digest) {
+		slog.Warn("File digest doesn't match timestamp digest",
+			"file_digest", digest,
+			"timestamp_digest", timestampFile.Digest)
+	}
+
+	// Get Bitcoin-attested sequences
+	bitcoinSequences := timestampFile.GetBitcoinAttestedSequences()
+	if len(bitcoinSequences) == 0 {
+		// If no Bitcoin sequences, check if there are pending sequences
+		pendingSequences := timestampFile.GetPendingSequences()
+		if len(pendingSequences) > 0 {
+			slog.Info("Timestamp is pending confirmation in the Bitcoin blockchain")
+			slog.Info("Use 'ots upgrade <file.ots>' to try upgrading it")
+
+			for _, seq := range pendingSequences {
+				att := seq.GetAttestation()
+				slog.Info("Pending at calendar", "url", att.CalendarServerURL)
+			}
+		} else {
+			slog.Error("No valid attestations found in this timestamp")
+		}
+		os.Exit(1)
+	}
+
+	// Verify each Bitcoin-attested sequence
+	verificationSuccess := false
+	for i, seq := range bitcoinSequences {
+		slog.Info("Verifying sequence", "index", i+1, "total", len(bitcoinSequences))
+
+		tx, err := seq.Verify(bitcoin, timestampFile.Digest)
+		if err != nil {
+			slog.Warn("Verification failed", "error", err)
+			continue
+		}
+
+		att := seq.GetAttestation()
+		slog.Info("Verification successful",
+			"block_height", att.BitcoinBlockHeight)
+
+		if tx != nil {
+			slog.Info("Bitcoin transaction", "txid", tx.TxHash().String())
+		}
+		verificationSuccess = true
+	}
+
+	if !verificationSuccess {
+		slog.Error("All verification attempts failed")
+		os.Exit(1)
+	}
+
+	slog.Info("Timestamp successfully verified")
+}