Segregated Witness: Exchanges, Wallets, Miners, and Companies Planning Integration
Segregated Witness is a proposal by Bitcoin Core developer Pieter Wuille. It uses a new data type to decrease the amount of data stored for each Bitcoin transaction. As a result, more transactions will fit into each block. Wuille’s Segregated Witness (or SegWit) allows for a practical increase in block space without the need for a hardfork.
In addition to scalability improvements, Segregated Witness helps with transaction malleability and decreases the cost to run a full node since less data needs to be stored. For more details, listen to this interview with Eric Lombrozo, or read this explainer.
The following list tracks wallets, exchanges, miners, and other Bitcoin companies that plan to implement Segregated Witness.
Initial Announcement
Eric Lombrozo, a Bitcoin Core dev and contributor to SegWit, announced on the bitcoin-dev mailing list that a number of wallets have already expressed support for SegWit: mSIGNA, GreenAddress, GreenBits, Blocktrail, and NBitcoin.
Ledger
Nicolas Bacca (btchip), an employee of Bitcoin security company Ledger, announced support for SegWit on reddit:
“We (Ledger) will be working on it soon - the changes to support SegWit are quite limited so I expect every hardware wallet to be compatible with it quickly.”
breadwallet
Aaron Voisine is the CEO and founder of breadwallet, perhaps the most popular Bitcoin wallet for iPhone. In an interview with Bitcoin Magazine, Voisine stated that breadwallet will support SegWit.
Full List
| # | Name | Planned | Ready | Notes |
|---|---|---|---|---|
| 1 | BitcoinJ | yes | no | library |
| 2 | Bitcoinjs | yes | no | library |
| 3 | BitGo | yes | no | wallet |
| 4 | Blocktrail | yes | no | wallet, block explorer |
| 5 | BreadWallet | yes | no | wallet |
| 6 | Coinfloor | yes | no | exchange |
| 6 | Coinkite | yes | no | wallet, hardware wallet |
| 7 | Coinomi | yes | no | wallet |
| 8 | Digitalbitbox | yes | no | hardware wallet |
| 9 | EI8HT | yes | no | wallet |
| 10 | Electrum | yes | no | wallet |
| 11 | GreenAddress | yes | no | wallet |
| 12 | GreenBits | yes | no | wallet |
| 13 | Ledger | yes | no | hardware wallet |
| 14 | libbtc | yes | no | library |
| 15 | libbitcoin | yes | no | library |
| 16 | mSIGNA | yes | yes | wallet |
| 17 | Mycelium | yes | no | wallet |
| 18 | NBitcoin | yes | no | library |
| 19 | OmniCore | yes | no | wallet |
| 20 | python-bitcoinlib | yes | no | library |
| 21 | pycoin | yes | no | library |
| 22 | Samourai Wallet | yes | no | wallet |
| 23 | Trezor | yes | no | hardware wallet |
What is Segregated Witness?
This inforgraph from Holy Transaction breaks down SegWit:
