SSP Academy

Guides, tutorials, and deep dives to help you master self-custody with SSP.

Browse by topic

Multisig Explained

How 2-of-2 multisignature actually works in SSP — and why it matters.

14 articles

Crypto Basics

Foundational concepts every crypto user should know.

14 articles

Security & Self-Custody

Protect your crypto: seeds, phishing, hardware, threat models.

31 articles

How-To Guides

Step-by-step walkthroughs for common SSP tasks.

15 articles

Coin & Chain Guides

Deep dives into individual coins and chains SSP supports.

22 articles

DeFi & Account Abstraction

Staking, lending, swaps, and ERC-4337 explained.

14 articles

Learning paths

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SSP Enterprise Vaults

6 parts

Solana Self-Custody in SSP

3 parts

Buy, Sell & Swap in SSP

5 parts

Sending Crypto with SSP

6 parts

Security Best Practices

6 parts

DeFi for Self-Custody Users in SSP

6 parts

Account Abstraction & ERC-4337 in SSP

5 parts

Ethereum & EVM in SSP

6 parts

Solana Multisig, Done the SSP Way

4 parts

Bitcoin in SSP

6 parts

Wallet Recovery Scenarios

6 parts

Crypto Wallet 101

5 parts

Multisig Deep Dive

7 parts

Self-Custody Fundamentals

6 parts

Latest articles

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Square SSP Academy cover: what the SSP relay server can and cannot see

What the SSP relay can and cannot see

The relay never holds a key and cannot sign — but for fifteen minutes at a time it handles your xpub and your unsigned transaction. What the TTL indexes actually enforce, and why the wallet is built to distrust our own server.

6 min
Square SSP Academy cover: verified smart contracts, proxies and upgrade keys

Verified contracts, proxies, and the upgrade key nobody mentions

A verification checkmark proves the source matches the bytecode — nothing more. Most contracts are proxies whose logic can be swapped after you approve them, which makes the real question who holds the upgrade key and whether there is a delay.

7 min
Square SSP Academy cover: layer 2 rollups versus sidechains

Layer 2s, sidechains, and the word everyone uses wrong

A real layer 2 inherits its security from the chain beneath it — and of the six EVM mainnets SSP supports, exactly one is a rollup. Why the same address across chains is a trap, and what a week-long withdrawal is actually buying you.

8 min
Square SSP Academy cover: blockchain confirmations, reorgs and finality

Confirmations and reorgs: how final is final?

Short reorgs are routine, six confirmations is a Bitcoin-scale convention rather than a law, and depth only means something relative to what a block costs to produce. Why confirmations matter when receiving and barely at all when sending.

7 min
Square SSP Academy cover: what actually backs stablecoins

Stablecoins: what actually backs them

Attestations are not audits, USDC broke its peg because a bank failed, and the major fiat-backed stablecoins can freeze your address. What a stablecoin actually is, and the ten minutes of checking worth doing before you hold one.

9 min
Square SSP Academy cover: quantum computing and cryptocurrency security

Quantum computing and your coins: what's actually at risk

Hashing is fine; signatures are not. Which of your coins are exposed today, why an address is not a public key, why 2-of-2 multisig barely helps here, and the one free thing you can do about it.

7 min
Square SSP Academy cover: practising self-custody on crypto testnets

Testnets: how to practise self-custody without risking anything

The thing that makes self-custody frightening is that mistakes are permanent — and that's exactly what a testnet removes. Which six SSP supports, what's genuinely worth rehearsing, why testnet keys come from a different branch of your seed, and the honest limits.

5 min
Square SSP Academy cover: cross-chain bridge hacks and wrapped tokens

Why bridges keep getting hacked, and what a bridged token actually is

Over $1.5bn from four incidents, and not one was a failure of the underlying chain. A bridged token isn't the asset — it's a claim on a pot someone else holds. What Ronin, Poly Network, Wormhole and Nomad each teach, and why two-device signing can't help once your funds are in a bridge.

6 min
Square SSP Academy cover: reading a blockchain explorer

How to read a block explorer, and why you should

An explorer lets you check your wallet's claims against the chain instead of taking them on faith. Which six fields actually matter, what an explorer can't tell you, and an honest note about whose node you're really reading when you tap through from SSP.

6 min
Square SSP Academy cover: proof of work versus proof of stake

Proof of work and proof of stake: what a blockchain is actually buying

Both mechanisms solve the same problem — making participation cost something real so identities can't be faked for free. One spends energy up front, the other risks the attacker's capital afterwards. What each actually buys, and why it matters far less to your security than you'd think.

6 min
Square SSP Academy cover: the UTXO model, account balances and Solana rent

Coins, balances and accounts: why "how much do I have" has three different answers

Bitcoin stores no balances at all, Ethereum stores a balance and a counter, and Solana charges rent for existing. Why that explains high fees on small payments, transactions that fail and still cost money, and tokens that seem to vanish.

6 min
Square SSP Academy cover: on-chain privacy and what a crypto address reveals

What your address reveals: privacy on a permanently public ledger

An address needs to be linked to you exactly once, and then its whole history — past and future — is linked too. How clustering heuristics work without your cooperation, what actually helps, and the honest limits of what SSP does today.

6 min