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Here are what I knew about them:

  1. eth.accounts.create: Generate an address and private key for transaction but did not stored in anywhere.
  2. personal.newAccount: Create an account under node, so that we could get these accounts by eth.getAccounts(). But before transaction, the account need to be unlocked.
  3. eth.accounts.wallet.add: Create an account and private key stored in memory wallet, can get them by eth.accounts.wallet._accounts.

As the topic, which one is more secure, easier to mange in node and recommended to use for erc20 tokens transfer.

Thanks.

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