Quote from: Jatmin on August 26, 2016, 04:54:39 PM

I sent 4 bitcoin and pay only $0.08 fee. It depends on the transaction size and age of the coin. I do use my own full node.

It doesn't matter that you're using your own node though. There's still a decent amount of nodes that both receive and relay low fee transactions. This policy changes a bit in 0.13.0 as the nodes will share minrelayfee information, e.g. node A won't relay transactions to Node B which node B wouldn't relay anyways (this is a waste of bandwidth).

Quote from: Ayers on August 26, 2016, 04:56:14 PM

can the confirmation be done by one node only?

No. Confirmations have nothing to do with nodes. Confirmations are related to mined blocks; nodes are used for relaying TX's and blocks.

Quote from: Ayers on August 26, 2016, 04:56:14 PM

how this can do against sybil attach? i thought that there were the need of multiple node to verify the ttransaction and confirm it

No. Read this book: Bitcoin For Dummies.

Quote from: sabbirshm on August 26, 2016, 04:59:27 PM

If you want to use premium wallets like blockchain you have to give them good fees.

No. Blockchain.info is not a premium wallet; it's just a web wallet. Those should be generally avoided.