@Test public void keyRecovery() { ECKey key = new ECKey(); String message = "Hello World!"; byte[] hash = HashUtil.sha256(message.getBytes()); ECKey.ECDSASignature sig = key.doSign(hash); key = ECKey.fromPublicOnly(key.getPubKeyPoint()); boolean found = false; for (int i = 0; i < 4; i++) { ECKey key2 = ECKey.recoverFromSignature(i, sig, hash); checkNotNull(key2); if (key.equals(key2)) { found = true; break; } } assertTrue(found); }