Coldcard 固件更新：共享 Mk4 和 Q新功能：? PushTX

PushTX.org 推出了一项新功能，允许 Coldcard 硬件钱包用户使用近场通信 (NFC) 技术广播新签名的比特币交易。

hardware wallet Coldcard users now have a new way to broadcast their freshly signed Bitcoin transactions, thanks to a new feature introduced by PushTX.org.

得益于 PushTX.org 推出的一项新功能，硬件钱包 Coldcard 用户现在可以通过一种新方式来广播他们新签名的比特币交易。

This feature, which is available for Coldcard Mk4 and Q models, aims to streamline the transaction process with a focus on security and privacy.

此功能适用于 Coldcard Mk4 和 Q 型号，旨在简化交易流程，重点关注安全和隐私。

Here's a closer look at how the NFC Push TX feature works and its technical considerations.

下面详细介绍了 NFC Push TX 功能的工作原理及其技术注意事项。

PushTX.org service now supports Coldcard Mk4 & Q models with a new feature: NFC Push TX. Once enabled with a service provider's URL, you can tap the COLDCARD and your phone will open a webpage that transmits your freshly-signed transaction onto the blockchain.

PushTX.org 服务现在支持 Coldcard Mk4 和 Q 型号，并具有新功能：NFC Push TX。使用服务提供商的 URL 启用后，您可以点击 COLDCARD，您的手机将打开一个网页，将您新签名的交易传输到区块链上。

See Settings > NFC Push Tx to enable… pic.twitter.com/6sajvEzT7G

请参阅“设置”>“NFC Push Tx”以启用... pic.twitter.com/6sajvEzT7G

— COLDCARD (@Coldcardwallet) August 11, 2023

- COLDCARD (@Coldcardwallet) 2023 年 8 月 11 日

NFC Push TX for Coldcard Hardware Wallets

Coldcard 硬件钱包的 NFC Push TX

The NFC Push TX feature can be enabled in the Coldcard device settings. Once activated, the Coldcard will display an NFC animation after a transaction is signed, indicating that it is ready to be broadcast.

可以在 Coldcard 设备设置中启用 NFC Push TX 功能。激活后，Coldcard 将在交易签署后显示 NFC 动画，表明已准备好进行广播。

When the user taps the Coldcard against a compatible smartphone, the phone's browser will detect an NFC tag that contains a URL. This URL includes the signed transaction encoded in base64url format, along with a truncated SHA-256 checksum for verification.

当用户将 Coldcard 触碰兼容的智能手机时，手机的浏览器将检测到包含 URL 的 NFC 标签。此 URL 包含以 base64url 格式编码的签名交易，以及用于验证的截断的 SHA-256 校验和。

As the URL is loaded in the phone's browser, it connects to a Bitcoin node and broadcasts the transaction to the network. This process simplifies the steps required to send Bitcoin transactions, potentially enhancing the user experience.

当 URL 加载到手机浏览器中时，它会连接到比特币节点并将交易广播到网络。此过程简化了发送比特币交易所需的步骤，可能会增强用户体验。

Public Services and Customization Options

公共服务和定制选项

PushTX.org offers support for various public services to broadcast transactions, including mempool.space/pushtx, coldcard.com/pushtx, and its own platform (pushtx.org/pushtx).

PushTX.org 为各种公共服务广播交易提供支持，包括 mempool.space/pushtx、coldcard.com/pushtx 及其自己的平台 (pushtx.org/pushtx)。

Moreover, users can host their own backend, which may be鏽 for those who prioritize privacy.

此外，用户可以托管自己的后端，这对于那些优先考虑隐私的人来说可能会被腐蚀。

Technical Considerations for NFC Push TX

NFC Push TX 的技术注意事项

There are some technical considerations to be aware of when using the NFC Push TX feature.

使用 NFC Push TX 功能时需要注意一些技术注意事项。

The complete URL for the NFC Push TX feature can be as large as 8,000 bytes, which may exceed the capacity of some web servers that do not support URLs beyond 4,000 bytes.

NFC Push TX 功能的完整 URL 可以长达 8,000 字节，这可能超出某些不支持超过 4,000 字节的 URL 的 Web 服务器的容量。

Additionally, the NFC implementation on some smartphones may also have limits. Any truncation errors in the URL will be detected by the checksum included with the transaction.

此外，某些智能手机上的 NFC 实施也可能存在限制。 URL 中的任何截断错误都将通过事务中包含的校验和进行检测。

The service URL provided must end with a ?, #, or &. While honest backends are expected not to log the IP address of incoming transactions, there is no way to enforce this, and it is important to note that services like CloudFlare will still see all traffic.

提供的服务 URL 必须以 ?、# 或 & 结尾。虽然诚实的后端不会记录传入交易的 IP 地址，但没有办法强制执行这一点，并且需要注意的是，像 CloudFlare 这样的服务仍然会看到所有流量。

With the introduction of NFC-based transaction broadcasting by PushTX.org, Coldcard users now have a new method for sending Bitcoin transactions.

随着 PushTX.org 推出基于 NFC 的交易广播，Coldcard 用户现在有了一种发送比特币交易的新方法。