Deadstock, an on-chain marketplace and liquidity layer for physical collectibles, has raised $2.5 million in seed funding led by Bullish Capital, the venture arm of Bullish, with participation from several angel investors. Created by ATH Labs and built on Arbitrum, Deadstock combines physical inventory, tokenization, marketplace trading and redemption infrastructure. The funding will support its transition to public testing and the next phase of building infrastructure for the globally liquid trading card market.