Steem Dollars are liquid stable-value currency tokens designed to be pegged to $1 USD. Steem Dollars can be traded with STEEM and transferred to other accounts for commerce or exchange.
Wrapped Bitcoin Tokens (WBTC) is an ERC20 token fully backed by real BTC. The proof of reserves is on-chain, showing the exact 1:1 ratio between minted WBTC tokens and BTC stored by the custodians. A collaborative effort with a community of partners to bring Bitcoin to the Ethereum network will bring the stability and value of Bitcoin to Ethereum's expansive ecosystem of decentralized applications.