Shadows is a decentralized synthetic asset issuance protocol debeloped based on Substrate. These synthetic assets are guaranteed by the Shadows Network pass DOS. As long as DOS is locked in a smart contract, synthetic assets can be issued. Unique debt pool design mechanism. The transaction of synthetic assets is essentially a transfer between debts. The smart contract automatically executes the conversion of a synthetic asset into another synthetic asset. There is no need for an order book, no counterparty, and no Liquidity and transaction slippage issues.