ALTER TABLE {$NAMESPACE}_legalpad.legalpad_documentsignature
ADD secretKey VARCHAR(20) NOT NULL COLLATE utf8_bin;
ALTER TABLE {$NAMESPACE}_legalpad.legalpad_documentsignature
ADD verified TINYINT(1) DEFAULT 0;
ALTER TABLE {$NAMESPACE}_legalpad.legalpad_documentsignature
ADD KEY `secretKey` (secretKey);