duanjingwen
@duanjingwen
@simayunguang47 Can you tell the exact purpose for which you are asking this question because I still find your question vague. File extension is highly subjective matter and differs from wallet to wallet, for example Electrum wallet file doesn't even have the extension. By the way, this page covers wallet formats for few notable wallets: https://en.bitcoin.it/wiki/Wallet And what exactly do you mean by 'online wallet'? All wallets need to be online to broadcast the transaction. Or do you mean 'web wallet'? In that case, unlike blockchain.info, most of the web wallets are custodial wallets and don't create wallet file for users. They rather save users' keys in centralized database. Moreover, I doubt whether there were many notable web wallets in 2009-2012 period. Anyhow, you need to be more clear with your question and tell us what exactly are you trying to achieve to get more relevant answers.
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duanjingwen
@duanjingwen
am not a developer mate , am just a business man who's entering the crypto world , now am just doing what is called " a business documentation " , which is basically info gathering about the history of the field that am entering to , i choose bitcoin as a sample , and now am stucking in : '' Bitcoin Wallets database storing file formates and its structure '' !!! so if any one can help with that it would be appreciated ... and he could get hired officially in the future if he proves more deep knowledge about bitcoin .
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