Nowadays we can buy and sell bitcoins through the exchanges or some centralized platforms (e.g., localbitcoins.com). Usually The exchanges will ask for your identification and the platforms will hold your bitcoins before the trade starts. It’s not so reliable for your privacy or the safety of your coins.

We are planning to build a P2P market in YardWallet with multisig escrow. And these are the steps:

• The sellers can post advertisements in the market. They will set the price, payment methods and other necessary information.
• The buyers choose a seller in the market and send him/her the buying request with amount.
• The seller can accept the request and escrow bitcoins into a 2-of-3 multisig address which is generated by  3 keys. One is held by the seller, one by the buyer, the last by our platform. Any 2 of them can transfer the escrowed bitcoins.
• Now it’s safe for the buyer to complete the payment to the seller because the escrowed bitcoins can’t be transferred only by the seller.
• Once the seller receives the payment, he/she will release the bitcoins to the buyer and the trade is completed.

What if the buyer or the seller want to scam?

• If the buyer claims  to have completed the payment who actually not, the seller can start a dispute to get support from the platform. We’ll ask the buyer to send us the evidence about the payment. If there’s no evidence or response the seller will get back the escrowed bitcoins with his/her key and the platform’s.
• If the seller doesn’t release bitcoins in time after receiving the payment, the buyer can start a dispute to get support from the platform. We will check the evidence about the payment that the buyer provides. Once we confirm the payment, the buyer will get the escrowed bitcoins with his/her key and the platform’s.

With these measures, the sellers can hold bitcoins in their local wallet at ordinary times. Only when a trade is started the seller needs to escrow bitcoins which will be jointly controlled by the seller, the buyer and the platform instead of only by the platform. So it’s much safer for the bitcoins and more convenient than the centralized platforms.

What do you think? Any suggestion is heavily appreciated. Thank you.

Update - June 3, 2015

- Local merchants map: Showing merchants accepting bitcoin and bitcoin ATMs in your local area

http://i.imgur.com/BBnhMUM.jpg   http://i.imgur.com/wg8QSw9.jpg

你可以向我们的保险柜发款，你会发现，每次使用的是不同的3方地址，而且你可以查询这个3方地址的组成，每次都是由不同的3把私钥形成的，我不太明白您说的“没有在私钥层面上做到这一点”是什么意思，我们采用的时标准且安全的多方签名。
关于开源，请务必放心。版本目前处于小范围公测阶段，我们的计划是每次在下一个重大更新发布时，开源上一个版本。而且下一个版本很快就会来临。所以很快我们就会开源，我们目标肯定要上bitcoin.org。约在1到2个月内肯定开源。另外您可以去我们网站试用in house版本，有新功能哟~~，app store版本大概会在这周5、6上线。
其实你从我们产品的设计、UI、交互逻辑上都可以看出我们的努力与认真。我们还在努力解决比特币的使用，一个易用安全的钱包，只是我们的第一步~~
我们公司其实不是一个新公司，去年我们就从事比特币的支付业务yardpay.com，与国内多家上市公司都有合作，比如神州付、金象网等。
最后，请您给我们您注册的邮箱地址，我们会赠送2mbtc给您玩玩~~
非常感谢您的支持

try out YardWallet. I will send 1mbtc for you to test it out.

Thank you all the feedback so far.

I will offer 1mbtc for you to test our product.

Just let me know your registration email, I will send the coin right away.

Yes it's a wallet app for iPhone. The addresses of the wallet rely on the seed value on your phone and you can control your bitcoins completely.
Only some features just like sending bitcoins with email accounts need the external servers.

If you are interested in the app, please download it and have a try. Thanks.

There's a feature that YardWallet users can send bitcoins with their email accounts. So users will be asked to create an account at first.

We just live one key on the phone and the rest will only show once when you open the vault account. Users should keep the second key in a safe place very carefully.

You can try our app with a tiny amount or leave your email account and I will send you some btcs for the trial.

YardWallet is a decentralized bitcoin wallet based on HD Wallet (BIP32) technology. It gives you 100% control of your bitcoins.

In YardWallet there is a 2-of-3 multi-sig vault with 2FA. You take 2 keys and we take one that only you can completely control your bitcoins.
When sending and requesting bitcoins, you can add your encrypted account information in the transaction so that others can confirm your identity.
Also you can add encrypted message in the transaction that only the recipient can decrypt and read it.

Website: http://yardwallet.com
AppStore: https://itunes.apple.com/us/app/yardwallet-bitcoin-wallet/id977152922

http://i.imgur.com/TSdHz9x.pnghttp://i.imgur.com/Wyehz5p.pnghttp://i.imgur.com/zGgftcz.pnghttp://i.imgur.com/2nJ3tQ6.pnghttp://i.imgur.com/JB6rpLE.png

Features:
- Send and receive bitcoin payments
- Store bitcoins securely in the 2-of-3 multisig vault with 2FA
- Each transaction generates a new address for maximum privacy
- Send bitcoin via email, QR code and bitcoin address
- Transaction password protection
- Add encrypted identity information in the transaction
- Add encrypted message in the transaction
- Transaction history with full transaction details
- Display of Bitcoin amount in BTC and mBTC
- Multiple fiat currency supported

It will be open source soon.
For more information, please see http://yardwallet.com

Update - June 3, 2015
- Local merchants map: Showing merchants accepting bitcoin and bitcoin ATMs in your local area

http://i.imgur.com/BBnhMUM.jpg   http://i.imgur.com/wg8QSw9.jpg