As far as I know, Segregated Witness and OP_CHECKSEQUENCEVERIFY are the last features needed to be able to fully implement a trustless bi-directional payment channel, from start to finish. (Technically you don't need OP_CHECKSEQUENCEVERIFY, it just makes channels a lot better)

Does testnet3 support those features?

If not, is there another public development chain which has those features?

  1. Yes, testnet3 supports SegWit as of block 834624.
  2. Yes, testnet3 supports both OP_CSV and OP_CLTV.

You might also be interested to know that there is a segnet test network on another port number. See https://bitcointalk.org/index.php?topic=1453392.0 for more details.

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    Segwit activated on testnet3 in block 834624 (may 13th), and segnet was deprecated after that... – Pieter Wuille Jul 20 '16 at 21:09
  • @Pieter -- If we run Core wallet v.0.13.0-rc1 on Testnet now, does it mean the transactions we make are segwit transactions? And how can I find out they're segwit transactions? Thank you. – moli Jul 20 '16 at 21:55
  • You need to use addwitnessaddress <normaladdress> to make the wallet produce a witness P2SH address. If you're paid through that address, and then spend those coins, then yes, it will be a segwit transaction. – Pieter Wuille Jul 20 '16 at 22:50

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