k - https://github.com/nebulasio/wiki/blob/master/tutorials/%5BEnglish%5D%20Nebulas%20101%20-%2003%20Smart%20Contracts%20JavaScript.md { 'source': '\"use strict\";var DepositeContent=function(t){if(t){let n=JSON.parse(t);' + 'this.balance=new BigNumber(n.balance),this.expiryHeight=new BigNumber(n.expiryHeight)' + '}else this.balance=new BigNumber(0),this.expiryHeight=new BigNumber(0)};' + 'DepositeContent.prototype={toString:function(){return JSON.stringify(this)}};' + 'var BankVaultContract=function(){Loca