Coldcard 韌體更新：共享 Mk4 和 Q新功能：? PushTX

PushTX.org 推出了一項新功能，讓 Coldcard 硬體錢包用戶使用近場通訊 (NFC) 技術廣播新簽署的比特幣交易。

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.

由於 PushTX.org 推出的一項新功能，硬體錢包 Coldcard 用戶現在可以透過一種新方式來廣播他們新簽署的比特幣交易。

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

此功能適用於 Coldcard Mk4 和 Q 型號，旨在簡化交易流程，並專注於安全和隱私。

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

以下詳細介紹了 NFC Push TX 功能的工作原理及其技術注意事項。

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 服務現在支援 Coldcard Mk4 和 Q 型號，並具有新功能：NFC Push TX。使用服務提供者的 URL 啟用後，您可以點擊 COLDCARD，您的手機將開啟一個網頁，將您新簽署的交易傳輸到區塊鏈上。

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

請參閱“設定”>“NFC Push Tx”以啟用... 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 硬體錢包的 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 設備設定中啟用 NFC Push TX 功能。啟動後，Coldcard 將在交易簽署後顯示 NFC 動畫，表示已準備好進行廣播。

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.

當使用者將 Coldcard 觸碰相容的智慧型手機時，手機的瀏覽器將偵測到包含 URL 的 NFC 標籤。此 URL 包含以 base64url 格式編碼的簽章交易，以及用於驗證的截斷的 SHA-256 校驗和。

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.

當 URL 載入到手機瀏覽器時，它會連接到比特幣節點並將交易廣播到網路。此過程簡化了發送比特幣交易所需的步驟，可能會增強用戶體驗。

Public Services and Customization Options

公共服務和自訂選項

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 為各種公共服務廣播交易提供支持，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，用戶可以託管自己的後端，這對於優先考慮隱私的人來說可能會被腐蝕。

Technical Considerations for NFC Push TX

NFC Push TX 的技術注意事項

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

使用 NFC Push TX 功能時需要注意一些技術注意事項。

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 可以長達 8,000 字節，這可能超出某些不支援超過 4,000 位元組的 URL 的 Web 伺服器的容量。

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，某些智慧型手機上的 NFC 實作也可能有限制。 URL 中的任何截斷錯誤都將透過交易中包含的校驗和進行檢測。

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.

提供的服務 URL 必須以 ?、# 或 & 結尾。雖然誠實的後端不會記錄傳入交易的 IP 位址，但沒有辦法強制執行這一點，需要注意的是，像 CloudFlare 這樣的服務仍然會看到所有流量。

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

隨著 PushTX.org 推出基於 NFC 的交易廣播，Coldcard 用戶現在有了一種發送比特幣交易的新方法。