Quote from: beterhans on December 18, 2017, 04:19:10 PM

One is Electrum.
it's address is start with bc1 yeah it's great and it gave you private keys
BUT. blockchain.info can't search it's transaction.

seems like bc1 address is not compatible with old wallet and system.

Blockchain.info does not yet properly support SegWit. Stop using blockchain.info and you won't have that problem.

Quote from: beterhans on December 18, 2017, 04:19:10 PM

1. is an address start with 3 is a multi sign address?

No. An address that starts with 3 is a P2SH address.

P2SH can be used for multi-sig, but it can be used for other purposes as well (such as SegWit).

Quote from: beterhans on December 18, 2017, 04:19:10 PM

that means you don't have full rights on you coins?

That depends on the address. If it is multi-sig and you don't have exclusive access to enough of the keys, then you don't have full rights. If it is not multi-sig and/or you do have exclusive access to enough of the keys, then you do have full rights.

Quote from: beterhans on December 18, 2017, 04:19:10 PM

2. is an segwit address need to be a multi sign address?

No. It can be, but is doesn't have to be.

Quote from: beterhans on December 18, 2017, 04:19:10 PM

3. which segwit wallet will give me the full right? (don't need others to approve)

Electrum is one. There are probably others. I haven't built a list yet.

Quote from: beterhans on December 18, 2017, 04:19:10 PM

4. if No.3 is no is that means segwit is a system that need someone to approve you transaction?

No. SegWit does not require someone to approve your transactions.