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I see that Mt. Gox now supports the Google Authenticator app (on Android, iOS - iPhone, iPad, iPod Touch, and on Blackberry) for 2-factor authentication (in addition to support for Yubikey, of course).

What are all the various 2-factor (also referred to as multi-factor) methods available for Bitcoin-related sites (exchanges, eWallets, mining pools, other services, etc.)?

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Good post - "A plea to exchanges ... lets do 2 factor right!": bitcointalk.org/index.php?topic=109424.0 – Stephen Gornick Nov 5 '12 at 16:56

2 Answers

up vote 10 down vote accepted

Bitcoin Currency Exchanges:

  • Mt. Gox: OTP using YubiKey or Google Authenticator
    1. Options: [On Login] | [For WIthdrawals] | [For Changes To Security]
  • Camp BX: OTP/Google Authenticator
  • Bitstamp: OTP/Google Authenticator
  • Bitcoin-24: OTP using Google Authenticator and for withdrawal SMS messaging
  • Bitcoin-otc: GPG authentication with gribble bot
  • BitMarket.eu: OTP/Google Authenticator
  • Coinbase - OTP/Authy
  • FYB-SG (Singapore) - OTP/Google Authenticator
  • VirWoX - OTP/Google Authenticator
  • WeExchange.co - OTP/Google Authenticator
  • Local Bitcoins - OTP/Google Authenticator

Other Exchanges:

Other Services:

  • BitPay: OTP/Google Authenticator

EWallets:

  • Blockchain.info/wallet - Google Authenticator, e-mail verification, SMS, and YubiKey (but not Mt. Gox YubiKey).
  • WalletBit - SecureCard (or perhaps OTP/Google Auth has been added now?)
  • Coinbase - SMS text messaging-based two-factor, Authy (Android/iOS app similar to Google's)
  • Paytunia - OTP/Google Authenticator or Yubikey (but not Mt. Gox Yubikey)
  • bitZino - OTP/Google Authenticator

Mining Pools:

  • MaxBTC - Yubikey and Google Authenticator
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Blockchain.info also supports "email 2-factor auth". You are sent a code to a predefined email address whenever you try to open your wallet. – ripper234 Jul 5 '12 at 4:54
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Awesome, thanks. I've added it. – Stephen Gornick Jul 5 '12 at 5:21
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Actually to be pedantic blockchain also supports SMS and yubikey as well ;) – Ben Reeves Jul 10 '12 at 9:12
Added, thanks!! – Stephen Gornick Jul 10 '12 at 23:07
Actually, to be extremely pedantic, blockchain.info does not support Yubikey, at least, not properly. – David Feb 1 at 13:56
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up vote -1 down vote

They use 2 Factor ID at ZIGGAP which I found to be one of the best new exchanges out there.

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Hello and welcome to the StackExchange. Please keep your answers on topic - singing praises about Ziggapp is tangential to what is being asked. Please specify which two-factor authentication methods are available in the site mentioned. – ThePiachu Feb 25 at 10:33
Moreover, please link it. – Lohoris Feb 25 at 14:05
ZIGGAP is now ZIGGONE, as in no longer serving customers. – Stephen Gornick Jun 9 at 0:12

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