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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?

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  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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