Entering your Bitcoin address is safe. Because it's open information and have not perform any problems. You can check any Bitcoin address for private key leak.
We have a huge database of private keys, with following rules of generating this base:

• Couple of thousands ordinal keys in the beginning and the end of Bitcoin range
  
• Some keys are from the middle, quarters and fifth parts of Bitcoin range
  
• Every 100 keys are from numerical ranks.
• There are nice address combinations, like a 1AAAAAA..., 1BBBBBB..., 1CCCCCC... etc.
• There are well-turned private key combinations in HEX and decimal (yes it is weird but it can be)
  For example: FFFFFFFFFFFF or 1234567890
• We use a Dictionary atack to Brain Wallets.
  Brain wallet is a standard wallet that generates its address by hashing a words passphrase to create a private key and therefore a Bitcoin address. Memorizing passphrases is simple enough for people then strong passwords with different symbols. But most peoples use simple and repeatly words to easy keep in mind. It is this type of lackluster precaution that makes brain wallets inherently insecure, as the foundation for the password is far too weak. We collect simple words into dictionary and randomly combinate to creation private keys.
  It's like a: "Home sweat home..."
• Open forums and documentation examples etc... leaked to internet
• White Hat's hackers gotten keys as a proof of hack.
  Yes, we leave in crypto currency age. And sometimes hackers found valnurability in Exchangers, Traders, Wallet websites and crypto storages. White Hat hackers got access and pass it to website owner, as a bounty hunter. Owner fix valnurability breach and pay fee to hacker.

You can check your address in our database. And if your private key is in secure, we can monitor and notify you about any leaks by email.

We are honest comunity and we make history all together with you !