StateChain
StateChains are a cryptographic structure that consists of a chain of digital signatures transfering ownership of a specific statecoin (a bitcoin UTO) between owners. Similar to a blockchain or sidechain, the statechain acts as immutable cryptographic proof of ownership and a proof that a statecoin(bitcoin UTXO) has not been double spent.
In of February 2022, MercuryWallet was the first implementation has been deployed.