Staking mechanisms in Blockchain / Solidity - Step-by-Step Execution

Concept Flow - Staking mechanisms

User Locks Tokens

↓

Tokens are Staked

↓

Network Validates Stake

↓

User Earns Rewards

↓

User Can Unstake Tokens

↓

Tokens Returned After Lock Period

This flow shows how users lock tokens to stake, earn rewards, and then unstake tokens after a lock period.

Execution Sample

Blockchain / Solidity

def stake_tokens(user_balance, stake_amount):
    if stake_amount > user_balance:
        return "Insufficient balance"
    staked = stake_amount
    user_balance -= stake_amount
    rewards = staked * 0.05
    return user_balance, staked, rewards

This code simulates staking tokens, checking balance, deducting stake, and calculating rewards.

Execution Table

Step	user_balance	stake_amount	Condition (stake_amount > user_balance)	Action	Output
1	1000	200	200 > 1000? False	Stake 200 tokens, reduce balance	(800, 200, 10.0)
2	1000	1200	1200 > 1000? True	Return error	"Insufficient balance"

💡 Execution stops when stake amount exceeds user balance or after successful staking and reward calculation.

Variable Tracker

Variable	Start	After Step 1	After Step 2
user_balance	1000	800	1000
stake_amount	200	200	1200
staked	0	200	0
rewards	0	10.0	0

Key Moments - 2 Insights

Why does staking fail when stake_amount is greater than user_balance?

Because the condition 'stake_amount > user_balance' becomes True (see execution_table row 2), the function returns 'Insufficient balance' and does not proceed to stake tokens.

How are rewards calculated after staking?

Rewards are calculated as 5% of the staked tokens (see execution_table row 1 output: rewards = 10.0 for 200 staked tokens).

Visual Quiz - 3 Questions

Look at the execution table, what is the user_balance after successfully staking 200 tokens?

A 800

B 1000

C 1200

D 200

💡 Hint

Check execution_table row 1 under user_balance after staking.

At which step does the staking fail due to insufficient balance?

A Step 1

B Step 2

C No failure

D Both steps

💡 Hint

Look at the condition column in execution_table row 2.

If the reward rate changes to 10%, what would be the rewards for staking 200 tokens?

A 5.0

B 10.0

C 20.0

D 200.0

💡 Hint

Calculate 10% of 200 tokens as shown in variable_tracker rewards calculation.

Concept Snapshot

Staking mechanisms:
- User locks tokens to stake
- Stake amount must be <= user balance
- Rewards are earned based on staked tokens
- Tokens are locked during staking period
- User can unstake after lock period ends

Full Transcript

Staking mechanisms involve users locking their tokens to support the network. The code example shows a function where a user stakes tokens if they have enough balance. If the stake amount is greater than the user's balance, staking fails. Otherwise, the stake amount is deducted from the balance, and rewards are calculated as 5% of the staked tokens. The execution table traces these steps, showing variable changes and conditions. Key moments clarify why staking can fail and how rewards are computed. The visual quiz tests understanding of balance changes, failure conditions, and reward calculations. Overall, staking locks tokens, earns rewards, and allows unstaking after a period.