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Not Your Keys, Not Your Coins

A principle stating that if you do not control your private keys, you do not fully own your cryptocurrency.

General
Updated: Mar 19, 2026
Also known as: NYKNYC self-custody principle

What Is a Not Your Keys, Not Your Coins?

A Not Your Keys, Not Your Coins (NYKNYC) is a principle in cryptocurrency emphasizing that ownership of crypto assets depends on control of their private keys. If you store your cryptocurrency on an exchange or a third-party service, you do not directly control the private keys. Without control of these keys, you do not have true ownership of your coins, regardless of what account balances show.

The principle works by highlighting the relationship between private keys and blockchain access. Private keys are cryptographic codes that authorize transactions and prove ownership on a blockchain. When you hold your keys in a personal wallet, such as a hardware wallet or a secure software wallet, you alone can sign transactions. If keys are held by an exchange or custodial service, that entity can control the funds, potentially restricting access or losing them due to hacks, insolvency, or errors.

NYKNYC matters because it underlines the importance of self-custody in cryptocurrency security. Users who control their keys reduce the risk of losing funds to external failures. This principle encourages responsible storage practices and awareness of counterparty risks. It also empowers users with autonomy, ensuring they can transact freely without relying on intermediaries.

Key characteristics of NYKNYC include:

  • Self-custody: Users maintain private keys themselves, usually in hardware or software wallets.
  • Non-custodial storage: Funds are not held by exchanges or third parties.
  • Security awareness: Users must implement backup and recovery procedures for their keys.
  • Direct control: Only the key holder can authorize transfers, ensuring full ownership.

Overall, Not Your Keys, Not Your Coins is a foundational concept for secure cryptocurrency ownership and risk management.

GeneralCryptocurrency

Cryptocurrency is a digital or virtual currency secured by cryptography, operating on decentralized blockchain networks to enable secure, peer-to-peer transactions.

Read full definition
DefiSwap

In cryptocurrency, a swap is the direct exchange of one token for another on a blockchain, often via decentralized exchanges (DEXs) without intermediaries.

Read full definition
GeneralHODL

HODL is cryptocurrency slang for holding assets long-term despite price volatility, rather than selling. It originated from a 2013 forum post misspelling 'hold' as 'I AM HODLING.'

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WalletHot Wallet

A Hot Wallet is a cryptocurrency wallet connected to the internet, allowing for easy access and transactions but more vulnerable to hacks.

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GeneralSelf-Custody

Self-custody means users control their own private keys to manage cryptocurrency assets directly, without third-party custodians. It embodies 'not your keys, not your coins.'

Read full definition
SecurityCrypto Security

Crypto Security refers to practices, tools, and protocols that protect cryptocurrencies, private keys, wallets, and blockchain networks from theft, hacks, and unauthorized access.

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SecurityBackup

A backup in cryptocurrency is a secure copy of a wallet's seed phrase or private keys. It enables recovery of funds if the original wallet is lost or damaged.

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SecurityRecovery

Recovery is the process of restoring access to a cryptocurrency wallet using its seed phrase or mnemonic backup if the original wallet is lost or inaccessible.

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Real-World Examples

Example 1: When setting up a Ledger hardware wallet, you are reminded to securely store your private keys. If you lose access to your keys, you lose access to your coins, even if they still show up in your account on an exchange.

  • In this case, controlling your private keys ensures you have full ownership of your funds.

Example 2: After storing Bitcoin on an exchange for several years, Sarah learns that the platform was hacked and users lost their funds. Had she followed the 'Not Your Keys, Not Your Coins' principle and stored her private keys in a personal wallet, she could have avoided the loss.

  • This highlights how exchanges control your keys and, without access to them, you don’t truly own your assets.

Example 3: John chooses to use a self-custody software wallet like Electrum instead of leaving his Bitcoin on a centralized exchange. By maintaining control over his private keys, he ensures his assets are secure from exchange shutdowns or security breaches.

  • In this scenario, John follows the NYKNYC principle by managing his own keys for greater security.

Example 4: Before traveling, Mark backs up his hardware wallet recovery phrase and ensures he has access to his private keys in case his device is lost or damaged. This precaution prevents him from losing access to his cryptocurrency.

  • Mark’s actions reflect the importance of secure backup and recovery as part of the 'Not Your Keys, Not Your Coins' philosophy.
HardwareLedger

Ledger is a brand of hardware wallets that securely store cryptocurrency private keys offline, such as the Ledger Nano series.

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DefiSwap

In cryptocurrency, a swap is the direct exchange of one token for another on a blockchain, often via decentralized exchanges (DEXs) without intermediaries.

Read full definition
BlockchainBitcoin

Bitcoin (BTC) is the first decentralized cryptocurrency, launched in 2009. It uses blockchain technology for secure, peer-to-peer digital transactions without intermediaries.

Read full definition
GeneralSelf-Custody

Self-custody means users control their own private keys to manage cryptocurrency assets directly, without third-party custodians. It embodies 'not your keys, not your coins.'

Read full definition
WalletHot Wallet

A Hot Wallet is a cryptocurrency wallet connected to the internet, allowing for easy access and transactions but more vulnerable to hacks.

Read full definition
WalletElectrum

Electrum is a lightweight Bitcoin wallet that allows users to store, send, and receive Bitcoin securely. It is known for its speed and low resource usage.

Read full definition
SecurityRecovery

Recovery is the process of restoring access to a cryptocurrency wallet using its seed phrase or mnemonic backup if the original wallet is lost or inaccessible.

Read full definition
GeneralCryptocurrency

Cryptocurrency is a digital or virtual currency secured by cryptography, operating on decentralized blockchain networks to enable secure, peer-to-peer transactions.

Read full definition
SecurityBackup

A backup in cryptocurrency is a secure copy of a wallet's seed phrase or private keys. It enables recovery of funds if the original wallet is lost or damaged.

Read full definition

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