Update dbEncryptionKey setup

[humanagent]

Update dbEncryptionKey setup in create-a-client documentation to define keys and compute hex-based dbEncryptionKey in create-a-client.mdx

The documentation for creating a client is updated to define key variables and compute the database encryption key from a hex string while adjusting headings and examples in create-a-client.mdx. • Add fromString import from uint8arrays/from-string and compute dbEncryptionKey using fromString(encryptionKey, "hex") in create-a-client.mdx.
• Introduce walletKey and encryptionKey constants and replace inline literals in the first code example in create-a-client.mdx.
• Update user creation to use walletKey and remove creation of signer while leaving signer referenced in Agent.create in create-a-client.mdx.
• Remove the 0x prefix from the XMTP_DB_ENCRYPTION_KEY example value and change section headings to level 2 for "Generate random keys" and "Use environment variables"; remove the "Configure an XMTP client" heading in create-a-client.mdx.

📍Where to Start

Start with the updated code example that defines walletKey, encryptionKey, and computes dbEncryptionKey using fromString in create-a-client.mdx, then review the Agent.create snippet for the missing signer definition.

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Project	Deployment	Preview	Comments	Updated (UTC)
docs-xmtp-org	Ready	Preview	Comment	Oct 27, 2025 11:20pm

[humanagent]

hey @bennycode , added a way to explain how to load an existing encryption key. needs

import { fromString } from "uint8arrays/from-string";