Bitcoin Security: ✅Crazy large numbers ✅ ECDSA ✅ Private key set up ✅ Private key management tools ✅ UTXOs stored on widely distributed nodes ✅fee market: responsively resistant to attacks ✅ coin emission and time stamping via POW ✅ node consensus enforcing monetary policy ✅voluntary updates with backwards compatibility ✅ mining incentives: soaking up low cost energy ✅ energy producers ✅humans who embrace personal responsibility