What is the polkadot $DED coin?
Could you please elaborate on the concept of the Polkadot $DED coin? I'm particularly interested in understanding its unique features, the role it plays within the Polkadot ecosystem, and any potential benefits it offers to investors or users. Additionally, I'd like to know about its issuance mechanism, market performance, and any challenges or opportunities it faces in the current cryptocurrency landscape. Could you provide a concise yet comprehensive overview of the $DED coin?