is that danger to bitcoin blockchain in any way ?
There many altcoins that use the same method for generating public addresses as other alt coins and bitcoin. For example, Teracoin and Bitcoin addresses are 100% compatible. There have been several cases of people sending bitcoins to an address in a Teracoin wallet at BTC-e. They were actually sending to a Bitcoin address because the two systems are completely separate, but you can imagine the confusion it caused.