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How to make safety saving private keys to mongodb? JavaScript, node.js

using the web3.eth.account.create() method returns: { address: "0xb8CE9ab6943e0eCED004cDe8e3bBed6568B2Fa01", privateKey: "0x348ce564d427a3311b6536bbcff9390d69395b06ed6c486954e971d960fe8709", signTransaction: function(tx){...}, sign: function(data){...}, encrypt: function(password){...} } How to make safety saving private keys to mongodb? I was researching bcrypt, hashcode, but hascode is not safety and bcrypt encoding requires…

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