Blockchains — why it matters and how to avoid costly mistakes

What is a blockchain?

Blockchain — like separate countries

Imagine each blockchain is a separate country. Each country has its own currency, its own addresses, its own rules. You can't send Lithuanian euros straight to a Japanese bank — you have to convert them. In exactly the same way, you can't send SOL straight to an Ethereum address.

A blockchain is a network of computers that stores every transaction. Each network is a separate world.

Every block has its own "fingerprint" (hash) and references the hash of the block before it. That's why changing an old transaction is impossible — it would break the entire chain after it.

The most important rule — and it's simple

Every blockchain is a separate network. SOL only exists on the Solana network, ETH only on the Ethereum network. That means there's just one thing you need to know: before sending, check the address. Starts with 0x = Ethereum, doesn't = Solana. Check that, and you know you're sending correctly.

The core networks in our strategy

Solana SOL

What matters	Solana
Address format	Letters and numbers, e.g. `7Xm...kP9`
Transaction speed	1–2 seconds
Transaction cost	Under $0.01
"Gas" currency	SOL
DeFi protocols	Kamino, Orca, Meteora, Jupiter
Wallet	Jupiter Wallet (recommended)

Solana is the fastest and cheapest network in our strategy. Every operation costs a fraction of a cent. Ideal for active DeFi use.

Ethereum ETH

What matters	Ethereum
Address format	Starts with `0x...`, e.g. `0xAb5...3F7`
Transaction speed	~12 seconds
Transaction cost	~$0.01–0.30 (mainnet)
"Gas" currency	ETH
DeFi protocols	Aave, Uniswap
Wallet	MetaMask

Ethereum is the oldest and largest DeFi network. It has the most money and the most protocols. Fees are low during quiet periods, but they move with network load — during peak times they can temporarily jump several times over, so before a larger operation it's worth checking etherscan.io/gastracker.

Arbitrum (Ethereum Layer 2) ETH

What matters	Arbitrum
Address format	Same as Ethereum: `0x...`
Transaction speed	<1 second
Transaction cost	<$0.01–0.05
"Gas" currency	ETH
DeFi protocols	Aave, Uniswap, Camelot
Wallet	MetaMask (need to add the Arbitrum network)

Arbitrum — a highway alongside Ethereum

Ethereum mainnet is usually free-flowing and cheap, but during a jam the fee jumps several times over. Arbitrum is like a highway running alongside it — the fee stays small and stable (under $0.01) even during a jam, and the security is the same (because it inherits Ethereum's protection).

In our strategies we always use Arbitrum instead of Ethereum mainnet. Faster and more predictable.

Comparing the networks

	Solana	Ethereum	Arbitrum
Speed	1–2 sec	~12 sec	<1 sec
Cost	Under $0.01	~$0.01–0.30	<$0.01–0.05
Security	High	Highest	Ethereum-level
DeFi protocols	Kamino, Orca, Meteora	Aave, Uniswap	Aave, Uniswap
Wallet	Jupiter Wallet	MetaMask	MetaMask

How to transfer money

Within the same network (simple)

A transfer within the same network is simple. Like a payment within the same bank:

Solana → Solana: Jupiter Wallet → another Solana wallet. Speed: 2 sec, cost: under $0.01
Ethereum → Ethereum: MetaMask → another MetaMask wallet. Speed: ~12 sec, cost: ~$0.01
Arbitrum → Arbitrum: MetaMask → another MetaMask. Speed: <1 sec, cost: under $0.01

Between different networks — there's a safe path

Moving assets from one network to another is possible — it just matters which path you take. Direct transfers use bridges (digital connectors between networks), but there's a simpler and safer alternative, which I'll show below.

Why we choose an exchange, not a bridge

Bridges have historically been the most common point of major losses in DeFi — a few well-known cases:

Ronin Bridge: $625M (2022)
Wormhole Bridge: $326M (2022)
Nomad Bridge: $190M (2022)

The solution is simple: between Solana and Ethereum, travel through a CEX exchange (shown below). That way you simply avoid this whole risk point — not out of fear, but by choosing a better path.

How to transfer between networks correctly

The safest path: through a CEX exchange

Instead of a risky bridge, use an exchange as the intermediary. It takes longer, but it's safer.

Solana → Ethereum:

Jupiter Wallet → send SOL to Nexo (via the Solana network)
Nexo: sell SOL → buy ETH
Nexo → withdraw ETH to MetaMask (via the Arbitrum network!)

Ethereum → Solana:

MetaMask → send ETH to Nexo
Nexo: sell ETH → buy SOL
Nexo → withdraw SOL to Jupiter Wallet (via the Solana network)

Why through an exchange?

Even though it looks longer, this path is the safest because:

There's no bridge risk (no program that can be hacked)
Nexo supports both networks (Solana and Ethereum/Arbitrum)
It takes 5-15 minutes, but your money is safe

If you still want a bridge

If you need a bridge for Ethereum → Arbitrum (the same network type, lower risk):

Official Arbitrum Bridge: bridge.arbitrum.io — slower (7-day withdrawal), but the safest
Third-party: Stargate, Across — faster, but higher risk

Between Solana and Ethereum: don't use a bridge. Use the exchange path.

5 spots you're now learning to check

These five situations cause the most confusion for beginners. The good news — each one has a clear check that, once done, lets you move on calmly:

#	Mistake	What happens	How to avoid it
1	SOL sent to an Ethereum address	Money lost forever	Check the address format: 0x... = ETH, otherwise = SOL
2	ETH withdrawn on Ethereum mainnet when you needed Arbitrum	Extra step — you'll need to move it to Arbitrum again (bridge or via an exchange)	Pick the "Arbitrum" network on the exchange
3	USDC (a stable-value cryptocurrency pegged to $1) sent on the wrong network	Money lost or stuck	USDC exists on multiple networks — always check!
4	Bridge program hacked	All funds in the bridge lost	Don't use bridges — use an exchange
5	Forgot to add the Arbitrum network to MetaMask	Won't accept the transfer	chainlist.org → "Arbitrum One" → Add

USDC — one currency, but several networks

USDC on multiple networks — good to know upfront

USDC isn't a single token. It exists separately on multiple networks:

USDC on the Solana network
USDC on the Ethereum network
USDC on the Arbitrum network

They aren't directly interchangeable — Solana USDC can't be sent straight to an Ethereum address. The solution is simple: if you need USDC on another network, you go through an exchange as the intermediary.

It's like euros in different banks — the currency is the same, but the transfer goes through an intermediary. Once you understand this, moving USDC between networks becomes just another operation you know how to do.

Network-selection checklist

Before every transfer, check:

Do I know which network I'm sending to? (Solana / Ethereum / Arbitrum)
Is the recipient's address valid for this network? (0x... = ETH/Arbitrum, otherwise = Solana)
Does the exchange/wallet support this network? (check the withdraw options)
Do I have "gas" on that network? (SOL on Solana, ETH on Ethereum/Arbitrum)
Is this my first time? → always test with a small amount!

Map of protocols and networks

Protocol	Network	Wallet	Link
Kamino	Solana SOL	Jupiter Wallet	kamino.finance
Orca	Solana SOL	Jupiter Wallet	orca.so
Meteora	Solana SOL	Jupiter Wallet	meteora.ag
Jupiter	Solana SOL	Jupiter Wallet	jup.ag
Aave	Ethereum/Arbitrum ETH	MetaMask	app.aave.com
Uniswap	Ethereum/Arbitrum ETH	MetaMask	app.uniswap.org
Deribit	Centralized exchange	—	deribit.com

Remember: Orca and Meteora = Solana only. Uniswap = Ethereum/Arbitrum only. Never mix networks.

Quick check

What happens if you send SOL to an Ethereum address?

Practice task

0 / 5

Learn to tell networks apart from an address

The most expensive crypto mistake is mixing up networks. This task will teach you to recognize a network from its address format in about 5 minutes — no purchase needed.

This is learning, not investing — use only small amounts you treat as tuition.

You just learned to tell networks apart and choose a safe path between them — this is the foundation the rest of the strategy stands on. Most people never fully piece this together.

Ethereum vs Solana Stablecoins