update YBTC description

Author: Nanyan

docs/YBTCFamily/YBTC/introducing-ybtc.md

@@ -5,7 +5,7 @@ image: https://static.bitlayer.org/images/covers/Bitlayer_YBTC_White.png?t=16884
 
 # Introducing YBTC
 
-YBTC is a trust-minimized bridged Bitcoin engineered for maximum security, serving as the core asset in Bitlayer's Bitcoin DeFi roadmap.
+A next-generation, trust-minimized Bitcoin-pegged asset. Positioned as the future of Bitcoin within the DeFi ecosystem in multiple blockchains.
 
 - **Trust-Minimized Minting**: YBTC can only be minted through the official [Bitlayer BitVM Bridge](https://bitvmbridge.bitlayer.org/home). This bridge is built on the BitVM2 paradigm, inheriting its trust-minimized properties.
 - **Native Multi-Chain Asset**: Leveraging the bridge's advanced architecture, YBTC is designed as a multi-chain asset. Support begins with Ethereum and will expand to other blockchains, including:

docs/YBTCFamily/ybtc_family.md

@@ -7,4 +7,4 @@ sidebar_label: YBTC Family
 
 - **Bitlayer Native BTC**: The native, Bitcoin-pegged asset for Bitlayer Network V1. It is integrated directly at the protocol level, functioning as a first-class system currency similar to ETH on Ethereum or BTC on the Bitcoin mainnet, rather than as a traditional ERC-20-style token.
 - **YBTC.B**: A wrapped token representation of Bitlayer Native BTC.
-- **YBTC**: A next-generation, trust-minimized Bitcoin-pegged asset. Positioned as the future of Bitcoin within the DeFi ecosystem, YBTC is slated to become the native currency for the upcoming Bitlayer Network V2 and V3 upgrades.
+- **YBTC**: A next-generation, trust-minimized Bitcoin-pegged asset. Positioned as the future of Bitcoin within the DeFi ecosystem in multiple blockchains.