Specie-backed Cryptocurrencies

Silver-backed cryptocurrencies

• SilverCoin (SILVER)
• SilverToken (SLVT)
• Silgonex (SIL)

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Good review:
"The Top 3 Silver-Backed Cryptocurrencies".

Gold-backed cryptocurrencies

• Perth Mint Gold Token (PMGT)
• DigixGlobal (DGX)
• Gold Coin (GLC)
• Tether Gold (XAUT)
• Meld Gold (MCAU)
• Pax Coin (PAXG)
• Hayek Coin

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Good review: "Top Five Gold-Backed Cryptocurrencies in 2020".

Long list of gold-backed cryptos.

Firms offering both gold and silver coins

• Lode (AUX and AGX)
• Kinesis (KAU and KAG)
• Elbaite (AUS and AGS)
• Tether intends to offer Tether Silver.