The pinned address, the proxy for MoveUSD and MintFx; null until deployed.
<chainId>:<contract>.
From the proxy's ERC-1967 slot; null on anything else.
The upgrade on a proxy or the delay change on the timelock, while one is in flight.
Whether wallet-api signs on this chain; false is read-only.
One contract on one chain of this stage, with its drift derived from the chain.