RecruitingProcedureWATCH (Wearable Artificial inTelligence for Cardiac Function and Health Monitoring)The purpose of this study is to find a cost effective cardiovascular (CV) surveillance of cancer survivors over long periods of time to prevent the risk of progression of heart failure (HF) and related morbidity and mortality. Mobile device-based artificial intelligence (AI)-electrocardiogram (ECG) can reliably detect cardiac dysfunction in lymphoma and sarcoma survivors and smart watch based surveillance for cardiotoxicity is feasible and reliable.