cross-chain-bridge-guide SKILL.md skillA
cross-chain-bridge-guide from nirholas/three.ws is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add nirholas/three.ws/cross-chain-bridge-guide@git:20260501.87cefc9Pins git:20260501.87cefc9 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- nirholas/three.ws
- Path
data/skills/defi/cross-chain-bridge-guide/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260501.87cefc9, committed May 1, 2026
- Size
- 7,964 bytes
- Repository stars
- 269
- License
- Apache-2.0
Guide to cross-chain bridges — bridge architectures, trust assumptions, security risks, major bridges comparison, and bridging best practices. Covers Stargate, Across, Hop, Wormhole, and official L2 bridges. Use when helping users move assets between chains safely.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Cross-Chain Bridge Guide
Bridges move assets between blockchains. This guide covers how they work, which to use, and how to stay safe.
## Why Bridges Exist
Each blockchain is an isolated system. Bridges connect them:
```
Ethereum ←──Bridge──→ Arbitrum
↕ ↕
Bridge Bridge
↕ ↕
Base ←──Bridge──→ Polygon
```
**Use cases**:
- Move ETH from Ethereum to Arbitrum for cheaper DeFi
- Access protocols only available on specific chains
- Consolidate assets scattered across chains
## Bridge Architectures
### Type 1: Native Bridges (Official L2 Bridges)
Used by rollup L2s to move between L1 and L2.
| Bridge | Route | Deposit Time | Withdrawal Time |
|--------|-------|-------------|-----------------|
| **Arbitrum Bridge** | ETH ↔ Arbitrum | ~10 min | **7 days** (fraud proof) |
| **Optimism Bridge** | ETH ↔ Optimism | ~10 min | **7 days** (fraud proof) |
| **Base Bridge** | ETH ↔ Base | ~10 min | **7 days** |
| **zkSync Bridge** | ETH ↔ zkSync | ~10 min | ~1 hour (ZK proof) |
**The 7-day problem**: Optimistic rollups require a 7-day challenge period for withdrawals to L1. This is why third-party bridges exist.
…Read the whole file at its exact version.
How to install
mdr add nirholas/three.ws/cross-chain-bridge-guide@sha256:8ce38e4795e6c941The line at the top of this page pins the label git:20260501.87cefc9, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_xs3ke6ggiozjqs4t)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on May 1, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7964 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
nirholas/three.ws · 269 stars · license Apache-2.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_xs3ke6ggiozjqs4t GET https://markdownregistry.com/api/v1/resolve?ref=nirholas/three.ws/cross-chain-bridge-guide GET https://markdownregistry.com/api/v1/blob/8ce38e4795e6c9414b6d15dea742a031fd61a7eb3856eb4176505f1a1119870d
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.