Washington State Senators have sponsored a blockchain bill, introduced it to the Senate, and it is now in Committee.
The bill (SB 5638 – 2019-20 Recognizing the validity of distributed ledger technology), in short, recognizes blockchain and other DLT technology as valid… as the name implies.
This makes it so rules generally applied to other technologies can be applied to blockchain, for example so transactions and messages sent on blockchain would be legally recognized in WA state.
So for example, a blockchain-based contract would be enforceable.
For details, click the above link and read the bill yourself.
The benefit of bills like this is that they can set a precedent for other states and/or for future federal legislation.