Zelcore

Crypto Security — Keep Your Assets Safe

Seed phrase hygiene, scam patterns, hardware wallets, and how to sleep at night.

Nearly every catastrophic crypto loss traces back to a handful of mistakes: the seed phrase stored wrong, a signature approved too fast, a copy-pasted address tampered with. These articles walk through each of them — what the attack looks like, why it works, and how to defend against it.

Flat illustration: an under-funded token box next to an empty hourglass, and a well-funded, shielded box next to a half-full hourglass

Ergo Storage Rent Explained: How Dormant Token Boxes Get Claimed

On Ergo, a box unmoved for four years can be claimed by anyone. How storage rent works, what happened to Flux's reserve, and how to protect your tokens.

7 min read
Building Your 2026 Wallet Threat Model

Building Your 2026 Wallet Threat Model

Build a personal crypto wallet threat model for 2026: a profile-based stack picker and an 8-point checklist that engineers redundancy over memorisation.

7 min read
Social Recovery Wallets: Safe, Argent, and Coinbase Compared

Social Recovery Wallets: Safe, Argent, and Coinbase Compared

Safe, Argent, and Coinbase Smart Wallet each offer seedless recovery — but their guardian models, time-locks, and trust assumptions differ sharply.

8 min read
Passkeys for Crypto: Great as a Factor, Dangerous as the Only Key

Passkeys for Crypto: Great as a Factor, Dangerous as the Only Key

Passkeys crush phishing and passwords, but a single passkey as your only crypto key inherits cloud-sync recovery risk. Treat it as a factor, not the key.

8 min read
MPC Wallets Explained: TSS, Shamir, and 2-of-3

MPC Wallets Explained: TSS, Shamir, and 2-of-3

MPC wallets split signing so the private key never exists whole. TSS vs Shamir, 2-of-3 share layouts, and who holds what — real security or relocated trust?

10 min read
Beyond the Seed Phrase: A Map of Modern Self-Custody

Beyond the Seed Phrase: MPC, Passkeys, Smart Accounts and Social Recovery

The seed phrase concentrates everything into one failure point. A map of the designs that replace or wrap it, MPC and threshold signing, passkeys, smart accounts and social recovery, with the trade-offs of each and how to pick.

9 min read
Smart-Account Gotchas: Recovery, Cross-Chain Address Drift, and Signing Schemes

Smart-Account Gotchas: Recovery, Cross-Chain Address Drift, and Signing Schemes

The operational pitfalls of smart accounts in 2026: cross-chain address drift, recovery models that fail closed, signing schemes that don't shake hands with hardware, and a checklist.

10 min read
Picking a Smart Wallet: Coinbase Smart Wallet, Safe, Argent, and the Field

Picking a Smart Wallet: Coinbase Smart Wallet, Safe, Argent, and the Field

A practical, opinionated comparison of Coinbase Smart Wallet, Safe, Argent, and the rest of the field — recovery models, chain coverage, and Zelcore pairing tips.

9 min read
EIP-7702: Upgrading Your EOA in Place — and the New Phishing Surface It Created

EIP-7702: Upgrading Your EOA in Place — and the New Phishing Surface It Created

EIP-7702 lets a normal EOA temporarily run smart-contract code at the same address. It is useful — and it created a new one-signature phishing class.

3 min read
ERC-4337 Architecture: EntryPoint, Bundlers, and Paymasters Without Tears

ERC-4337 Architecture: EntryPoint, Bundlers, and Paymasters Without Tears

A plain-spoken walkthrough of ERC-4337's six roles, the UserOperation struct, EntryPoint v0.6 vs v0.7, paymasters, and the public alt-mempool.

8 min read
Why EOAs Are Obsolete: What a Smart Account Actually Does

Why EOAs Are Obsolete: What a Smart Account Actually Does

BundleBear shows 1.07B UserOps and 56.7M smart accounts. Here is why an EOA is structurally limited and what a smart account does instead.

8 min read
Your Personal Custody Plan — A Decision Framework

Your Personal Custody Plan — A Decision Framework

A step-by-step framework for deciding where your assets actually live: thresholds for hot vs cold, when a passphrase or multi-sig layer is worth it, inheritance planning, and concrete example allocations.

8 min read
Your Attack Surface: Phishing, Clipboard Hijackers, Fake Apps, and SIM Swaps

Your Attack Surface: Phishing, Clipboard Hijackers, Fake Apps, and SIM Swaps

A practical catalogue of the top attacks on self-custody users — address poisoning, clipboard malware, fake wallet apps, and SIM swaps — with concrete mitigations for each.

9 min read
The 25th Word: How a Passphrase Adds a Second Layer

The 25th Word: How a Passphrase Adds a Second Layer

How BIP-39 passphrases create a fully separate hidden wallet, why they're the strongest defence against physical seed-phrase theft, the brutal failure modes, and when this is genuinely worth the risk.

7 min read
Hardware Wallets: What They Actually Protect Against — and What They Don't

Hardware Wallets: What They Actually Protect Against — and What They Don't

A clear-eyed threat model: what a secure element defends against, what it doesn't, and how to build self-custody habits that don't depend on false confidence.

8 min read
The Multi-Chain Custody Problem — One Seed, Many Ledgers

The Multi-Chain Custody Problem — One Seed, Many Ledgers

Why a single BIP-32/44 seed unlocks accounts across Bitcoin, Ethereum, Solana, and 80+ other chains in Zelcore — and the practical implications for address reuse, chain-specific metadata, and protecting your one point of failure.

8 min read
"Not Your Keys, Not Your Coins" — What an Exchange Actually Holds

"Not Your Keys, Not Your Coins" — What an Exchange Actually Holds

Unpacks the difference between an IOU balance on an exchange and actual on-chain ownership, using concrete failures (FTX, Mt. Gox) to show what 'custodial' means in practice.

6 min read
    Crypto Security — Keep Your Assets Safe | Zelcore Academy