...I seek the transaction id in blockchain and says: "Sorry We Could not find any blocks or transactions matching this hash",
but I seek the same id in tradeblock and says that the transaction has not been confirmed.
I check in my wallet in blockchain and shows no pending transaction, but in tradeblock shows that the value I sent is pending.
Can someone explain to me what happened? It is normal that happen?
Normally, if you pay too little of a miner fee for the size of your tx,
blockchain.info will drop that pending tx from their mempool because they think it is spam,
but Tradeblock and some others will sometimes still carry yours in their mempool.
That is why you can find your tx in one site and not the other.
Normally, it is because you paid too little of a miner's fee (or in this case Xapo paid too little).