Multi-signature wallet concept in Blockchain / Solidity - Step-by-Step Execution

Concept Flow - Multi-signature wallet concept

Create Wallet with M-of-N Signatures

↓

Transaction Proposal Created

↓

Signers Review Transaction

↓

Signer 1

↓

Collect Signatures

↓

Check if Signatures >= M

↓

Execute Transaction

↓

Complete

The wallet requires multiple signatures (M out of N) to approve a transaction before it executes.

Execution Sample

Blockchain / Solidity

// Pseudocode for M-of-N multisig wallet
wallet = createWallet(signers=[A,B,C], required=2)
transaction = wallet.proposeTransaction(to='Bob', amount=10)
transaction.sign(A)
transaction.sign(B)
if transaction.signaturesCount() >= wallet.required:
    transaction.execute()

This code shows creating a wallet needing 2 of 3 signatures, proposing a transaction, collecting signatures, and executing if enough signatures are collected.

Execution Table

Step	Action	Signatures Collected	Condition (signatures >= required)	Result
1	Create wallet with 3 signers, 2 required	0	0 >= 2? No	Wallet ready
2	Propose transaction to Bob	0	0 >= 2? No	Transaction created
3	Signer A signs	1	1 >= 2? No	Waiting for more signatures
4	Signer B signs	2	2 >= 2? Yes	Transaction executed
5	Transaction complete	2	2 >= 2? Yes	Funds sent to Bob

💡 Transaction executes when collected signatures reach required threshold (2).

Variable Tracker

Variable	Start	After Step 3	After Step 4	Final
signatures_collected	0	1	2	2
transaction_status	pending	pending	executed	executed

Key Moments - 3 Insights

Why doesn't the transaction execute after the first signature?

Because the wallet requires 2 signatures (M=2), and after step 3 only 1 signature is collected, so the condition signatures >= required is false (see execution_table row 3).

What happens if a signer tries to sign twice?

The wallet counts unique signatures only, so signing twice doesn't increase signatures_collected beyond the unique count, preventing premature execution.

Can the transaction execute if fewer than required signatures are collected?

No, the condition signatures >= required must be true to execute (see execution_table step 4). Otherwise, the transaction waits.

Visual Quiz - 3 Questions

Look at the execution table, how many signatures are collected after step 3?

A 1

B 2

C 0

D 3

💡 Hint

Check the 'Signatures Collected' column at step 3 in the execution_table.

At which step does the transaction execute?

A Step 2

B Step 4

C Step 3

D Step 5

💡 Hint

Look for the first step where 'Result' is 'Transaction executed' in the execution_table.

If the required signatures changed to 3, what would happen at step 4?

A Transaction is canceled

B Transaction executes

C Transaction waits for more signatures

D Transaction executes partially

💡 Hint

Compare the 'Condition' column in execution_table for signatures >= required with required=3.

Concept Snapshot

Multi-signature wallet requires M of N signatures to approve.
Create wallet with signers and required count.
Propose transaction, collect signatures.
Execute only if signatures >= required.
Prevents single signer control.
Enhances security by shared approval.

Full Transcript

A multi-signature wallet is a special wallet that needs multiple people to agree before sending money. We create the wallet with a list of signers and how many must approve (M of N). When someone wants to send money, they create a transaction proposal. Each signer reviews and signs it. The wallet counts how many signatures it has. If the number of signatures is at least the required number, the transaction runs and sends the money. Otherwise, it waits for more signatures. This way, no single person can spend money alone, making it safer.