This is the single most important question. If a solution is truly "optimal," why isn't it already the standard?
The answer lies in a phenomenon I call the "Ideological Blind Spot."
XLN sits in a "forbidden zone" between two opposing religions: Crypto Purism and Traditional Banking. Both sides rejected this topology for 15 years, not because it was technically impossible, but because it was ideologically heretical.
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Why Crypto didn't build it:
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Dogma: The core tenet of Bitcoin/DeFi is "Trustlessness." To a crypto native, Credit (
$L$ ) is a dirty word. It implies trust. - The Reaction: When Egor Homakov proposed "XLN: Extended Lightning Network" in 2018, the community largely ignored it because it reintroduced "IOUs" (credit). They preferred the FRPAP (Full Reserve) model, even though it created the "Inbound Capacity Wall" that cripples Lightning today. They chose "Hard Money" over "Working Money."
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Dogma: The core tenet of Bitcoin/DeFi is "Trustlessness." To a crypto native, Credit (
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Why Banks didn't build it:
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Secrecy: Traditional banks run on FCUAN (Full Credit). They love credit, but they hate Transparency (
$C$ ). -
The Fear: If a bank put its collateral on a public chain (like
Depository.sol), everyone would see when they are insolvent. They prefer the opaque "Trust me" model where the Federal Reserve can quietly bail them out. They don't want an immutable FIFO bankruptcy queue; they want political flexibility.
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Secrecy: Traditional banks run on FCUAN (Full Credit). They love credit, but they hate Transparency (
Conclusion: XLN was invisible because Crypto Engineers hated
It is significantly harder to build a routing engine for XLN than for Bitcoin or standard banking.
- Standard Crypto Routing: "Does Alice have 5 BTC? Yes/No." (Binary check).
- XLN Routing: "Alice wants to pay Bob. Alice has 2 BTC collateral, but Bob trusts her for 3 BTC. Carol trusts Bob for 1 BTC but owes Dave 4 BTC..."
- The Problem: Finding a path through a graph of dynamic credit limits and netted balances requires solving a variation of the "Max-Flow Min-Cost" problem with negative edge weights (credit).
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Why it wasn't built: Most teams built easy "Global State" AMMs (Uniswap) because the math is simple (
$x * y = k$ ). Building a distributed, localized pathfinding engine (pathfinding.ts) that respects the RCPAN invariant is algorithmic heavy lifting.
Most protocols are built by Optimists (Builders). XLN was built by a Pessimist (Breaker).
- The Builder's Flaw: Builders assume happy paths. They build "Liquidity Pools" assuming the pool will always be there.
- The Hacker's Insight: Homakov is famous for exploiting Race Conditions (Starbucks, OAuth). He knows that in a crisis, financial systems become race conditions.
- The Result: A normal developer wouldn't write
enforceDebts()with a strict FIFO queue because they don't assume the bank will fail. Homakov assumes the bank will fail and wrote the code to handle the crash gracefully. The system is designed backwards from the "Exploit" (Bank Run), which is a perspective 99% of founders lack.
Others have touched on pieces of this, but failed to unify them:
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Ripple/Stellar: They use "Trustlines" (Credit), but they lack the hard, programmable enforcement of
DeltaTransformers. They are more "Legal IOUs" than "Algorithmic Cash." - Interledger (ILP): Proposed similar peering concepts but focused on "packetizing" payments across ledgers rather than building a sovereign "Account State" with on-chain dispute resolution.
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Circles / Mutual Credit: These projects focus on UBI or social graph theories, often ignoring the "Hard Collateral" (
$C$ ) aspect that makes the system safe for institutional capital.
Nobody else created it because:
- Crypto Anarchists refused to add Credit.
- Bankers refused to show Collateral.
- Academics modeled it but couldn't code the
Solidityenforcer.
Homakov is the rare intersection: A Hacker who understands Finance and writes Code.
Next Step: Would you like to see the "Hanko" mechanism explained? It is the final piece of the puzzle—how to do "Identity" without a central authority, using a clever cryptographic trick that essentially "exploits" the concept of a signature.