> For the complete documentation index, see [llms.txt](https://docs.bsquared.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bsquared.network/core_architecture/u2.md).

# U2 Stablecoin (BTC-Collateralized Settlement Layer)

## Overview

**U2** is the native stablecoin of B² Network, designed as a **BTC-collateralized, AI-native settlement asset**. It bridges the gap between Bitcoin’s role as a volatile reserve currency and the need for **stable, predictable pricing** in AI-driven and DeFi economies. U2 enables **AI Agents, miners, and users** to transact, collaborate, and settle with a consistent unit of account while maintaining Bitcoin exposure.

![U2](https://github.com/user-attachments/assets/58c3232d-96d2-4992-a974-2aea52b067ff)

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## Design Principles

* **BTC as Collateral**: Every U2 is minted against over-collateralized Bitcoin, ensuring trustless solvency.
* **Stability via Hedging**: Delta-neutral strategies (futures, perpetual swaps, basis trades) offset BTC volatility while preserving yield.
* **AI-Native**: Built for high-frequency, machine-to-machine (M2M) micropayments required by autonomous agents.
* **Transparent & Verifiable**: Collateral reserves and hedging operations are fully auditable on-chain, with anchoring into Bitcoin mainnet.

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## Minting & Redemption

1. **Minting**
   * Users or AI Agents deposit BTC into the protocol vault.
   * U2 is minted at a collateral ratio ≥150% to ensure system safety.
2. **Redemption**
   * U2 can be burned to redeem locked BTC at any time.
   * Automated liquidation mechanisms protect solvency during BTC price drawdowns.
3. **Dual Pathways**
   * **Classic Mint**: Conservative, fully backed by BTC reserves, 1:1 collateral.
   * **Innovative Mint**: BTC + derivative hedges expand U2 supply while maintaining peg stability.

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## Stability Mechanisms

* **Over-Collateralization**: Ensures solvency and resilience during market stress.
* **Delta-Neutral Hedging**: Offsets BTC volatility with market-neutral derivative strategies.
* **Funding Rate Arbitrage**: Captures yield from perpetual swap markets, distributing income to U2 stakers and the ecosystem.
* **Automated Liquidations**: Protect against under-collateralization, maintaining peg and system integrity.

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## Technical Features

* **BTC-Denominated Collateral**: Reinforces Bitcoin’s role as the ultimate reserve asset.
* **Cross-Layer Anchoring**: Collateral proofs and hedging records anchored periodically to Bitcoin via Taproot inscriptions.
* **Integration with AI Signal**: AI Agents can hold and transact in U2 as their stable settlement asset, while still holding BTC as reserve capital.
* **Developer APIs**: Enables dApp builders to integrate U2 into DeFi protocols, agent marketplaces, and cross-chain applications.

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## Use Cases

* **AI Agents**:
  * Settle micro-tasks, data exchange, or inference services with predictable pricing.
  * Engage in multi-agent collaboration without BTC volatility risk.
* **BTC Holders**:
  * Unlock liquidity by minting U2 against BTC while retaining BTC price exposure.
  * Earn BTC-native yield from hedging and arbitrage strategies.
* **Miners**:
  * Collateralize future hashrate or block rewards to mint U2.
  * Access immediate liquidity without selling mined BTC.
* **DeFi & Traders**:
  * Use U2 as a stable unit of account in lending, AMMs, and derivatives.
  * Perform arbitrage or structured strategies with BTC as reserve and U2 as settlement currency.

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## Role in B² Network

U2 is the **settlement backbone** of the Bitcoin + AI economy:

* Provides **price stability** for agents and users.
* Links **BTC’s reserve value** with **AI’s transactional demands**.
* Enables the closed economic loop: **BTC → Collateral → U2 → AI Agents → Settlement → back to BTC.**

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**In summary**: U2 transforms Bitcoin from a passive “digital gold” into an **active settlement medium** — making the vision of **“Put Bitcoin in Every AI’s Wallet”** a practical reality.