HyperLedger Fabric v1.1：向现有通道添加组织及config transaction签名问询

Great question—let's walk through how to properly handle config transactions and cross-org collaboration when adding a new organization to a Hyperledger Fabric v1.1 channel, sticking to real-world operational practices instead of the simplified test setup you referenced.

First, let's anchor this in the official Hyperledger Fabric v1.1 documentation:

在组织间切换以签署config transaction（或执行其他操作）并不反映Fabric的真实运行场景。单个容器绝不会挂载整个网络的crypto material。相反，配置更新需要通过安全的带外方式传递给Org2管理员进行检查和批准。

For your scenario with four existing organizations (Org1, Org2, Org3, Org4) adding a new org, here's the step-by-step collaborative workflow for config transaction handling:

1. Initiate the Config Proposal #

• An admin from one of the existing channel orgs (say, Org1) takes the lead to generate the config update proposal. This process uses only Org1's own crypto material—admin certificates, private keys, and MSP files—no sharing with other orgs allowed.
• Use the configtxlator tool to export the current channel config block, modify it to include the new org's MSP definition, anchor peer details, and any required policy updates, then generate the config proposal file.

2. Securely Share the Proposal Off-Band #

• The initiating org (Org1) sends the config proposal to Org2, Org3, and Org4 via a secure off-band channel. This could be encrypted file transfer, a secure inter-org messaging platform, or an authenticated API—whatever you use, it must prevent unauthorized access and tampering during transit.
• Each receiving org's admin first validates the proposal locally: they'll check that the new org's MSP config is correct, anchor peer info is accurate, and the changes won't negatively impact their own org's channel permissions or operations.

3. Distributed, Org-Specific Signing #

• Each org that approves the proposal signs it using their own crypto material—no cross-org sharing of private keys or full crypto material, and definitely no switching identities in a single container (that's just a test shortcut, not production-safe).
• After signing, each org sends their signed proposal fragment back to the initiating org (or a pre-agreed coordinator) via the same secure off-band channel.

4. Assemble & Submit the Final Config Transaction #

• Once the initiating org collects enough valid signatures (meeting the channel's ModPolicy—usually a majority of existing orgs), use configtxlator to assemble all signed fragments into a complete config transaction.
• Finally, the initiating org (or any org with channel write permissions) submits the full config transaction to the channel's orderer nodes using their own crypto material, completing the new org's addition to the channel.

Key Operational Rules to Follow #

• Crypto Material Isolation: Each org's crypto assets (private keys, certificates, MSP directories) must be strictly isolated—only authorized admins within the org should have access, never shared across orgs.
• Signature Authorization: Only each org's designated admins can sign config proposals, enforced by Fabric's MSP and channel policy rules.
• Off-Band Channel Security: Always use encrypted, authenticated channels to share proposals and signatures to avoid man-in-the-middle attacks or tampering.

内容的提问来源于stack exchange，提问作者Sarageorge