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SegWit wasn't fully activated until yesterday, so that time you payed the lower fee was during a time of less transaction traffic.
But if Segwit is activated now, is there any way to become a part of this upgrade? Do I have to do something for it to happen? Or will blockchain.info make transactions have segwit automatically? Can anyone help me with this?
Different wallets will have different roadmaps on when they are ready to support SegWit. I know that SatoshiLabs are planning to add Bitcoin SegWit support to their Trezor beta-wallet in a few days, so I guess other wallet providers won't be far behind. The way I understood it you'll have to move your BTC to a SegWit enabled address first (starting with a "3", like a multi-sig address) before being able to send a SegWit transaction, so that part of the process will probably be manual and require action on your side.
I still see the spam problem and nobody was able to explain it to me yet.
If a majority of the transactions we see at the moment are spam, and segwit needs to be activated by the user, how will segwit help to decrease the mempool?
The guys who make the spam transactions will simply not activate segwit.
Or have I missed something?
I'm sorry, I haven't found any sufficient explanation of this problem in this thread. What is it about? Why are you saying that most transactions are actually spam?
There's rumour that since that BTC has been under a spam transaction attack since at least the beginning of the year (ie. since the scaling debate started to get serious). Thus making the network seem more over capacity than it actually is. One thing that speaks for this rumor is that the spam attacks subseded late Juli when SegWit (or was it Segwit2x?) locked in.