According to the source, Fidelity filed an updated S-1 for a proposed Solana (SOL) ETF and removed the Rule 473 delaying amendment, which would allow the registration to become effective automatically after the statutory period; traders should verify on SEC EDGAR before acting (source: public post on X; verification via SEC EDGAR). Under SEC Rule 473, removing the delaying amendment permits automatic effectiveness after 20 days unless a new delay is filed or the SEC acts, which can compress the timeline to market launch once exchange approvals are in place (source: SEC, Securities Act Rule 473). Spot crypto ETPs typically require both an effective S-1 and an approved 19b-4 exchange rule change before trading begins, so monitoring the EDGAR docket and exchange rule filings is critical for timing signals (source: SEC orders for spot BTC and ETH ETPs, 2024). The source also suggested additional SOL ETFs may follow, indicating potential competitive filings that could influence fee structures and liquidity if confirmed (source: public post on X).