BA-00P · LESSON 06

Defend against scams and signing mistakes

Recognize seed phishing, clipboard replacement, address substitution, fake support, malicious approvals, and irreversible-payment pressure.

45 min Difficulty 1/5 Not started

VISUAL MODEL

See the whole mechanism before going step by step

Use the diagrams to orient yourself. Then the guided explanation below teaches every part in depth.

4 explanatory views

CONCEPT-SPECIFIC MAP · signing scamVerify the destination on the device that signsSelect any state to inspect its exact role.

RELATIONSHIP MAPOrdered mechanism flow

01
INTENTPay Bob's bc1q... address
The intended destination should come through an authenticated channel.
02
COMPUTERConstructs Bob output
Clipboard and browser content are not trustworthy enough to authorize by themselves.
03
SIGNER DISPLAYShows Bob's address
The hardware signer parses and displays the exact output it will sign.
04
HUMAN CHECKMatch, approve
Compare the complete or safely abbreviated destination using a known-good reference.
05
OUTCOMESigned payment to Bob
Confirmations cannot undo an authorized payment to the wrong destination.

Rule shown: A compromised computer can replace a copied address; only a trusted signing display can show what the key is actually authorizing.

STAGE 1 OF 5INTENT: Pay Bob's bc1q... address

The intended destination should come through an authenticated channel.

Governing relationship: A compromised computer can replace a copied address; only a trusted signing display can show what the key is actually authorizing. Complete path: 1. INTENT, Pay Bob's bc1q... address. The intended destination should come through an authenticated channel. 2. COMPUTER, Constructs Bob output. Clipboard and browser content are not trustworthy enough to authorize by themselves. 3. SIGNER DISPLAY, Shows Bob's address. The hardware signer parses and displays the exact output it will sign. 4. HUMAN CHECK, Match, approve. Compare the complete or safely abbreviated destination using a known-good reference. 5. OUTCOME, Signed payment to Bob. Confirmations cannot undo an authorized payment to the wrong destination.

1. State transitionWhat exists, what changes, and what results

BEFORE

A fake support agent sends a wallet download, asks for seed words, and supplies an address for a required verification payment.

MECHANISM

No legitimate helper needs recovery words or a private key. Treat any request to type them into a website, chat, remote-support tool, or giveaway as theft.

AFTER

Cryptographic validity cannot repair mistaken human intent, so the signing workflow must independently verify what the user means to authorize.

Text equivalent: Starting from A fake support agent sends a wallet download, asks for seed words, and supplies an address for a required verification payment. The mechanism begins when No legitimate helper needs recovery words or a private key. Treat any request to type them into a website, chat, remote-support tool, or giveaway as theft. The resulting lesson is Cryptographic validity cannot repair mistaken human intent, so the signing workflow must independently verify what the user means to authorize.

2. Mechanism pathSelect a stage to inspect its job

STAGE 1 OF 5

Classify the request

No legitimate helper needs recovery words or a private key. Treat any request to type them into a website, chat, remote-support tool, or giveaway as theft.

Complete path: 1. Classify the request: No legitimate helper needs recovery words or a private key. Treat any request to type them into a website, chat, remote-support tool, or giveaway as theft. 2. Verify software and identity: Start from a bookmarked or independently verified source. Check release signatures or reproducible evidence when available, and never trust a search advertisement as identity proof. 3. Compare destination independently: Clipboard malware and compromised screens can replace an address. For meaningful value, verify on a trusted signing display and confirm with the recipient through another channel. 4. Understand what is being signed: A Bitcoin transaction signature authorizes protocol fields. A message signature proves key control for a message. Neither proves that a business, investment, or price claim is true. 5. Slow down irreversible actions: Refuse artificial deadlines, test with a small amount, separate devices or people for high value, and stop when the transaction review differs from intent.

3. Rule and failure boundaryWhat accepts the result and where it can stop

ACCEPTED PATH

The user approves only independently verified software and exact transaction details, while recovery secrets never enter an online support or payment flow.

CHANGED CONDITION

A perfectly valid Bitcoin signature still sends funds to an attacker's output if the human approves the substituted destination.

Important distinction: A hardware wallet makes every displayed transaction safe. It protects keys and can provide a trusted display, but the user must still compare the address, amount, and fee with independent intent.

Text equivalent: The accepted path is enforced by The user approves only independently verified software and exact transaction details, while recovery secrets never enter an online support or payment flow. If the required condition changes, A perfectly valid Bitcoin signature still sends funds to an attacker's output if the human approves the substituted destination.

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Learn the idea

Most Bitcoin theft does not break cryptography. It tricks a person into revealing recovery words, installing false software, approving a substituted destination, or treating urgency as proof. A safe workflow assumes the screen, clipboard, website, caller, and unsolicited message can lie.

GUIDED EXPLANATION1/5 ideas inspected

Classify the request

No legitimate helper needs recovery words or a private key. Treat any request to type them into a website, chat, remote-support tool, or giveaway as theft.

The worked example follows the explanation

Inspect every idea above to open it.

Important distinction“A hardware wallet makes every displayed transaction safe.”

It protects keys and can provide a trusted display, but the user must still compare the address, amount, and fee with independent intent.

FINISH LEARNING FIRST

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