Outdated wallet RPC usage: `dumpwallet` and legacy wallet no longer supported in modern Bitcoin Core

[muhahahmad68]

Summary

Chapter 3 of the course material rely on legacy wallet behavior that is no longer supported in recent versions of Bitcoin Core. Commands like dumpwallet fail with unhelpful errors, and legacy wallet creation is entirely blocked, making it impossible for learners on current default setups to follow along.

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Reproduction

Issue 1 — dumpwallet in the chapter no longer exists

Running the tutorial command:

bitcoin-cli dumpwallet ~/mywallet.txt

Returns:

error code: -32601
error message:
Method not found

Issue 2 — Legacy wallet creation is blocked

bitcoin-cli -named createwallet wallet_name="my_wallet" descriptors=false

Returns:

error code: -4
error message:
descriptors argument must be set to "true"; it is no longer possible to create a legacy wallet.

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Root cause

• Bitcoin Core now uses descriptor wallets by default since v23
• Legacy (non-descriptor) wallet creation was fully removed in v30+
• RPC methods like dumpwallet are tied to the legacy key-store model and do not exist in descriptor wallets

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Suggested fixes

1. Migrate to descriptor-based workflow

Replace dumpwallet with the modern equivalent:

bitcoin-cli listdescriptors

Add a brief explanation of descriptor structure (pkh, wpkh, tr) and derivation paths.

2. Add context

A short note on the legacy → descriptor wallet transition would help learners understand why the change happened, not just what changed.

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Closing note

Updating the course to descriptor-based workflows would make the material more accurate for anyone running a current Bitcoin Core installation.