Grayscale withdrew its proposed spot ETFs for Cardano, Hedera and Polkadot on Aug. 7, filing all three withdrawal requests with the SEC within 190 seconds of each other: 4:33:37 p.m. ET for the Cardano trust, 4:34:55 p.m. for Hedera, 4:36:47 p.m. for Polkadot. A direct review of ...