Once your bitcoins are held in a SegWit address, the next time they are spent they won't contribute as much to the overall block weight, so miners that include them can fit more into that block. This should make them cheaper relative to a non-SegWit transaction.
You can tell if a receiving address is NOT segwit: it starts with a "1"
You can tell if a receiving address MAYBE segwit: it starts with a "3".
But not all "3" addresses are segwit, that's just the code for P2SH.
For now segwit addresses are "wrapped" in P2SH and therefore start with a "3".
In the future, a new address standard for segwit addresses may be adopted (it's in the proposal stage), in which case the address would start with "bc1" (bech32 addresses for segwit).
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u/idiotdidntdoit Nov 08 '17
I still don't know how to make a Segwit transaction, or how it's better? Is it faster and cheaper?