Revenue in USD: 0.008 LTC × $80 = $0.64. Minus Fee: $0.64 – $1.20 = -$0.56 (Loss).

The Takeaway: If the maintenance fee exceeds your daily mining yield, you lose money instantly. The best ltc mining cloud providers offer "all-inclusive" contracts where the fee is baked into the hashprice, or they have extremely low MCFs (under $0.05/MH).

We need to track user balances, purchased contracts, and payout history.

-- Users Table
CREATE TABLE users (
    id UUID PRIMARY KEY,
    email VARCHAR(255) UNIQUE,
    wallet_address VARCHAR(255), -- LTC Payout Address
    balance_ltc DECIMAL(20, 8) DEFAULT 0.00,
    created_at TIMESTAMP DEFAULT NOW()
);
-- Mining Contracts (Hashrate Plans)
CREATE TABLE contracts (
id UUID PRIMARY KEY,
user_id UUID REFERENCES users(id),
hash_rate_mhs DECIMAL(10, 2), -- Megahashes per second
duration_days INT, -- e.g., 365 days
maintenance_fee_daily DECIMAL(10, 4), -- Electricity cost deducted daily
start_date TIMESTAMP,
end_date TIMESTAMP,
status VARCHAR(50) DEFAULT 'active' -- active, expired, cancelled
);
-- Transaction Ledger
CREATE TABLE ledger (
id UUID PRIMARY KEY,
user_id UUID REFERENCES users(id),
type VARCHAR(50), -- 'mining_reward', 'maintenance_fee', 'payout'
amount DECIMAL(20, 8),
tx_hash VARCHAR(255), -- Blockchain hash for withdrawals
created_at TIMESTAMP DEFAULT NOW()
);

Always treat cloud-mining profitability projections as estimates, not guarantees.