948e7d9d70
- Rename post-commit-ots → post-commit - Rename pre-commit-ots → pre-commit - Remove legacy post-commit and pre-commit symlinks - Update install.sh and documentation - Simplified: only 2 hook files with standard names Hooks are now named exactly as git expects them, making manual installation more intuitive.
112 lines
2.8 KiB
Markdown
112 lines
2.8 KiB
Markdown
# Git OpenTimestamp Hook
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Automatically generate [OpenTimestamp](https://opentimestamps.org/) proofs for git commits with full Bitcoin attestation.
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## ⚠️ Requirements
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**Required:** `opentimestamps-client` (ots CLI)
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```bash
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pipx install opentimestamps-client
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```
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> **Note:** The Node.js `@opentimestamps/ots` package is **not supported** - it only creates local proofs without calendar submission or Bitcoin attestation. For tamper-evident timestamps, you must use the Python `opentimestamps-client`.
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## Quick Install
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```bash
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# Clone this repository
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git clone <repository-url>
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cd git-ots-hook
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# Install hooks (requires ots CLI)
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./hooks/install.sh /path/to/your/repo
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# Commit the proofs
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cd /path/to/your/repo
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git add .ots/
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git commit -m "Add OpenTimestamp proofs"
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```
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That's it! Every commit will now be timestamped and anchored to Bitcoin.
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## Manual Installation
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```bash
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# Copy hooks
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cp hooks/post-commit .git/hooks/post-commit
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cp hooks/pre-commit .git/hooks/pre-commit
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chmod +x .git/hooks/post-commit .git/hooks/pre-commit
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# Setup .gitignore
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echo ".ots/.attestation-cache" >> .gitignore
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```
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## What You Get
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- **Automatic timestamping** - Every commit gets a cryptographic proof
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- **Bitcoin attestation** - Proofs anchored to Bitcoin blockchain (~10 min)
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- **Full history** - Backfill hook upgrades all historical commits
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- **Smart caching** - Minimal network overhead after initial setup
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- **Tamper-evident** - Anyone can verify your commit history
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## Generated Files
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```
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repo/
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├── .ots/
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│ ├── <commit-hash>.ots # Individual proof (commit this)
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│ ├── proof.ots # Latest proof (commit this)
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│ ├── prev-commit.txt # Chain link (commit this)
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│ ├── commit-chain.txt # Full chain (commit this)
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│ └── .attestation-cache # Local cache (ignore this)
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└── ...
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```
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## Verification
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**Check a proof:**
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```bash
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ots info .ots/<commit-hash>.ots
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```
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**Verify attestation:**
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```bash
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ots verify .ots/<commit-hash>.ots
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```
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**Upgrade pending proofs:**
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```bash
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ots upgrade .ots/<commit-hash>.ots
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```
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## How It Works
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1. You make a git commit
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2. Post-commit hook extracts commit hash
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3. Hash submitted to 4+ remote calendar servers
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4. Calendars aggregate and anchor to Bitcoin
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5. After ~10 min: proof becomes Bitcoin-attested
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6. Pre-commit hook upgrades old proofs before new commits
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## Performance
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- **First backfill:** 30-60s (full history scan)
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- **Normal commits:** 10-15s (cached, minimal network)
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- **Attestation:** ~10 min (Bitcoin block time)
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## Uninstall
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```bash
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rm .git/hooks/post-commit .git/hooks/pre-commit
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```
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## Links
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- [OpenTimestamp](https://opentimestamps.org/)
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- [opentimestamps-client](https://github.com/opentimestamps/opentimestamps-client)
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- [Bitcoin anchoring explained](https://petertodd.org/2016/opentimestamps-announcement)
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## License
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MIT
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