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This address "
has unreachable spending condition due to RIPEMD-160" ? Could you elaborate please because I read this topic about this address and I didn't find a post telling that.
https://bitcointalk.org/index.php?topic=5418492_Counselor said "
no one knows its key, and it may well be that such a key does not exist at all" but he's not affirmative.
This address - 1111111111111111111114oLvT2, created from RIPE160 hash with all zero bits "0000000000000000000000000000000000000000"
Because there is no known attacks on ripe160, it is nearly impossible that someone found such input, that will produce that hash, even if you do not take into account double hashing when generating an address.
To get this address, you have to find a such EC point, that will produce such SHA256 hash, which in turn will produce 160 zero-bits RIPEMD.
So, 1111111111111111111114oLvT2 is valid BTC address, but no one knows its key, and it may well be that such a key does not exist at all.
Here's an explanation about it.
I don't read RIPEMD specification or how it works in detail, but did you mean RIPEMD-160 output always higher than zero?
RIPEMD-160, as the name suggests, always outputs a 160 bit/20 byte number. If it was to output 0000000000000000000000000000000000000000, then that would give the address 1111111111111111111114oLvT2 as has been discussed above, which is not provably unspendable however unlikely it is that someone knows one of the private keys. However, because it always outputs a 160 bit number, it will never output 0, and so there is no private key which will be able to unlock this script and move these coins.