Researcher StarkWare Avi Levy says that the main idea of the proposal is to replace the existing elliptic curve digital signature algorithm (ECDSA) of Bitcoin with hash-based proofs that will be difficult to imitate even with a quantum computer. Levy added that the main advantage of the QSB method is that it provides instant results. "The main advantage of QSB is immediate result delivery. Since it operates within Bitcoin's existing consensus rules, it does not require soft forks, miner confirmations, or activation deadlines." However, according to Levy, there are practical limitations to this proposal. Because QSB shifts Bitcoin's network security from signatures to computations, each transaction requires intensive processing on off-chain graphics processors. The cost of creating a valid transaction using cloud-based graphics processors is estimated at between $75 and $200 per transaction. This is more than 600 times higher than Bitcoin's current average transaction fee of about 33 cents. This makes the QSB method difficult to implement. In conclusion, Levy states that although this method could theoretically work within Bitcoin's current rules, it is experimental and not intended for widespread use. Levy also added that not all use cases, such as Lightning Network channels, are currently supported.