if you use normal wallet, there will be no such message("Unable to decode output address").
we have sent over 350,000 transactions so far, no such transactions have ever occurred.
you must have generated a transaction for double-spending purposes.
Why do you refer to blockchain.info ?
Ask them why can not they decode addresses, not me.
You accepted my bets and my bets won.
Please give me my payout
Take any block, for example
https://blockchain.info/block/000000000000000001f923ff7aafed53c31b0c06717eca7a4c877d343175fb72and search for a string "Unable to decode output address" there
You will see that a lot of normal transatrions can not be decoded
Do you think all of thems are doublespend attempts?