Compare custodians, software wallets, hardware devices, multisig, and MPC through the questions that matter when access is lost or compromised.
Start hereA custodial crypto exchange is a company that matches trades and holds customers' crypto-assets in wallets it controls, recording balances in its own ledger. Whether a balance is the customer's property or a debt the company owes depends on the account agreement and the law governing the contracting entity, and it is usually tested only if the company fails.
Part 2Crypto wallet security is a set of operational practices that keeps control of a self-custodied wallet's keys with its owner during everyday use. It covers five surfaces: the device that signs, the signatures granted to applications, the backups that restore access, the transfers sent, and the vendor software and firmware the wallet runs.
Part 3Wallet recovery is the set of mechanisms that restore signing authority after loss: a device failing, a phrase burning, an owner forgetting, or an owner dying.
Part 4Keeping crypto safe means controlling who can move your assets and making sure that someone is always you. In practice it is five disciplines working together: securing the accounts around your crypto with strong authentication, choosing custody so no single secret or company can lose everything, verifying what you sign before you sign it, limiting what strangers can learn abo…
Part 5A crypto wallet backup is a set of recovery materials that restores access to funds when the working wallet fails. It has three layers: the secret material the wallet's design requires, a written note on how the setup works, and the devices, shares or people the design depends on.
Part 6A crypto transfer is a signed instruction that moves an asset on one blockchain; once confirmed, the network generally cannot reverse it. It arrives only when three fields match what the recipient controls: the address identifies the recipient, the network identifies the ledger, and, at custodial destinations that pool customers, a memo or tag identifies the account.
Part 7The State of Crypto Self-Custody is a periodically updated research report that measures how crypto holders custody their assets: the share of value held in holders' own keys versus exchanges, custodians and funds, the number of people involved, the events that move them between models, and the technology they use.
Part 8The Wallet Vulnerability Ledger is a dated register of documented security failures in crypto wallet software, hardware and their distribution channels that records, for each incident, the affected products and versions, the disclosure date, the technical root cause, the patched status, any reported impact with its source, and a confidence label, so that implementation risk can be assessed from published evidence.
Part 9A key storage model is the arrangement that decides where a wallet's signing authority lives and what must be compromised, lost or coerced for assets to move. Software wallets hold keys on a connected device, trading safety for convenience. Hardware wallets isolate keys in a dedicated device designed to sign internally and keep key material inside.
Part 10A seed phrase, also called a recovery phrase, is a sequence of words, twelve to twenty-four under the BIP39 standard, that encodes the entropy from which a wallet mathematically derives its private keys.
Part 11A multisignature wallet is a custody arrangement that requires a threshold of independent keys, m of n, to authorise any transaction, enforced by the blockchain itself through a script or smart contract.
Part 12Proof of reserves is a disclosure practice that lets a custodial platform prove control of on-chain addresses and, in stronger versions, commit cryptographically to its customer liabilities, so each customer can check their own inclusion and an accountant, often under agreed-upon procedures, can compare the totals. It evidences asset control and inclusion at one snapshot.
Part 13A custody model is the arrangement that decides who controls the key able to move your crypto. Custodial services hold keys on your behalf, so you rely on the company. Single-key self-custody puts one key, and its seed phrase backup, entirely in your hands.
Are Crypto Exchanges Safe? Assessing Counterparty Risk. Start with the first guide. It introduces the vocabulary used by every later guide in this learning path.
No. Follow the sequence for a structured introduction, or open the guide that answers your current question and return to earlier material when a concept is unfamiliar.
Continue with one of the related clusters below. Each path approaches the same systems from a different angle.
Compare custodians, software wallets, hardware devices, multisig, and MPC through the questions that matter when access is lost or compromised. Keep the glossary open alongside the articles and use each knowledge check to identify concepts worth revisiting.
Learn who controls your assets, how keys fail, and how to make recovery possible. The guides separate protocol behaviour from the operational, market, custody, and human risks that surround it.
