BA-00P · LESSON 02

Receive a first payment

KEY DEFINITIONS

Terms used in this lesson

QR code: Quick Response code: a square barcode often used to move a PSBT or address across an offline boundary.

Create and verify a fresh receiving instruction, distinguish an address from a private key, and monitor the payment from unconfirmed relay to chosen confirmation depth.

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 · state machineOne valid action transforms a known stateSelect any state to inspect its exact role.

RELATIONSHIP MAPOrdered mechanism flow

01
BEFOREKnown state
Identify the facts and objects that exist before the action.
02
ACTIONReceive a first payment
The Receive a first payment lesson isolates the event that proposes a change.
03
RULEDeterministic check
The enforcing rule accepts or rejects the proposed transition.
04
AFTERSuccessor state
Accepted work creates a new state without silently changing the prior facts.
05
FAILUREState unchanged
A failed condition must not produce a partially accepted successor.

Rule shown: A valid transition names the prior state, action, enforcing rule, and successor state.

STAGE 1 OF 5BEFORE: Known state

Identify the facts and objects that exist before the action.

Governing relationship: A valid transition names the prior state, action, enforcing rule, and successor state. Complete path: 1. BEFORE, Known state. Identify the facts and objects that exist before the action. 2. ACTION, Receive a first payment. The Receive a first payment lesson isolates the event that proposes a change. 3. RULE, Deterministic check. The enforcing rule accepts or rejects the proposed transition. 4. AFTER, Successor state. Accepted work creates a new state without silently changing the prior facts. 5. FAILURE, State unchanged. A failed condition must not produce a partially accepted successor.

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

BEFORE

Noah creates a fresh mainnet address and a 75,000 sat payment request for a local sale.

MECHANISM

Mainnet, test networks, and other chains use different address encodings and assets. Sender and receiver must agree on the intended Bitcoin network before value moves.

AFTER

Share an address, never a secret, verify the destination independently, and treat confirmation policy as a risk decision.

Text equivalent: Starting from Noah creates a fresh mainnet address and a 75,000 sat payment request for a local sale. The mechanism begins when Mainnet, test networks, and other chains use different address encodings and assets. Sender and receiver must agree on the intended Bitcoin network before value moves. The resulting lesson is Share an address, never a secret, verify the destination independently, and treat confirmation policy as a risk decision.

2. Mechanism pathSelect a stage to inspect its job

STAGE 1 OF 5

Choose the correct network

Mainnet, test networks, and other chains use different address encodings and assets. Sender and receiver must agree on the intended Bitcoin network before value moves.

Complete path: 1. Choose the correct network: Mainnet, test networks, and other chains use different address encodings and assets. Sender and receiver must agree on the intended Bitcoin network before value moves. 2. Create a fresh receiving instruction: The receiving wallet derives a new address from its wallet policy. The receiver may add an amount and description to a QR or payment request without revealing a private key. 3. Verify on a trusted display: For meaningful amounts, compare the address shown to the sender with the address shown by the wallet or hardware signer. This catches clipboard or screen substitution. 4. Observe the candidate payment: After broadcast, the wallet may show an unconfirmed transaction. That is evidence of a payment attempt, not final settlement. 5. Choose confirmation depth: The receiver counts inclusion in the selected valid chain and later blocks. The acceptable depth depends on value, counterparty, replacement risk, and the receiver's threat model.

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

ACCEPTED PATH

The receiver checks network, amount, destination, and confirmation state independently rather than trusting a screenshot from the sender.

CHANGED CONDITION

A transaction screenshot, a wrong-network address, or an unconfirmed replaceable payment is not equivalent to a confirmed output controlled by the receiver.

Important distinction: A payment notification means the bitcoin is final. A notification may describe only an unconfirmed transaction or even data supplied by an untrusted service. The receiver should verify the transaction and its confirmation state.

Text equivalent: The accepted path is enforced by The receiver checks network, amount, destination, and confirmation state independently rather than trusting a screenshot from the sender. If the required condition changes, A transaction screenshot, a wrong-network address, or an unconfirmed replaceable payment is not equivalent to a confirmed output controlled by the receiver.

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Learn the idea

Receiving bitcoin begins with a payment instruction created by the receiver's wallet. It commonly contains an address, network, and optional amount. An address helps the sender construct a new output. It is safe to share, unlike the private key or recovery words, but using a fresh address for each payment improves privacy.

GUIDED EXPLANATION1/5 ideas inspected

Choose the correct network

Mainnet, test networks, and other chains use different address encodings and assets. Sender and receiver must agree on the intended Bitcoin network before value moves.

The worked example follows the explanation

Inspect every idea above to open it.

Important distinction“A payment notification means the bitcoin is final.”

A notification may describe only an unconfirmed transaction or even data supplied by an untrusted service. The receiver should verify the transaction and its confirmation state.

FINISH LEARNING FIRST

The questions unlock after every required learning activity

Inspect every guided idea, open the worked example, rebuild its mechanism, and complete the deterministic lesson tool. Your progress is saved automatically.