MADRID (Reuters) – Spain’s stock market supervisor said on Wednesday it had opened its first case relating to a possible infringement of recent rules governing mass advertising campaigns of cryptoassets. Madrid took steps to regulate the rampant advertising of cryptoassets at the start of 2022, tasking the CNMV stock market supervisor with authorising mass campaigns and making sure investors are aware of the risks involved. The CNMV said on Wednesday that it had opened disciplinary proceedings against Spanish technology provider Miolos S.L. over two mass campaigns advertising cryptoassets. It …