Blockchain-Grundlagen
Nodes, clients and RPC providers
An app can use a chain without independently verifying all the data it displays.
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438 · Artikel und Referenzen
Krypto-Geschichte
Nomad trusted-root failure
A 2022 Nomad upgrade left a zero root trusted, allowing copied calls to process messages as valid.
Betrugsmaschen
OAuth-consent phishing
A hostile application asks for access through a real identity-provider screen.
Krypto-Geschichte
OneCoin without a public blockchain
OneCoin sold a cryptocurrency story while criminal cases established a global fraud.
Krypto-Geschichte
OneCoin, 2026: asset recovery is not the same as repaying every victim
The compensation announcement describes recovered assets and a claims process, not a reversal of the original losses.
Krypto-Geschichte
OneCoin: a cryptocurrency story without the promised system
Recruitment commissions, fabricated mining and an operator-controlled price: the evidence behind the OneCoin fraud and Greenwood’s conviction.
Marktstruktur
Opaque insurance funds
A displayed fund balance hides ownership, withdrawals and cross-product liabilities.
Chains und Netzwerke
Optimism: fault proofs and withdrawal assumptions
A challenge mechanism is one part of a deployed rollup's security model.
Blockchain-Grundlagen
Optimistic rollups
Optimistic rollups publish state claims subject to challenges.
Blockchain-Grundlagen
Optimistic rollups: claims, challenges and the exit route
The security argument depends on what can be challenged and who can actually submit the challenge.
DeFi und Governance
Oracle freshness: a valid number can still be unusable
Price source, update conditions and failure handling belong in the same review.
Marktstruktur
Oracle override power
An administrator or small signer set can replace the price that drives credit and liquidation.
Märkte & Anreize · DeFi risk mechanics
Oracles and liquidation: when a price becomes an instruction
A number becomes dangerous when a contract uses it to decide borrowing capacity, settlement or liquidation.
DeFi und Governance
Oracles: which price controls the contract?
A price feed has sources, update conditions and failure modes.
Betrugsmaschen
OTC escrow impersonation
A supposed neutral escrow is controlled by a participant or accomplice.
DeFi und Governance
Overcollateralised debt positions
A borrower locks assets worth more than debt under protocol valuations.
KOLs und Werbung
Paid promotion: preserve the incentive trail
A public post and a private allocation can tell different parts of the story.
KOLs und Werbung
Paid promotion: what the audience needs to know
Payment, token exposure and the presentation of the message all affect how an endorsement is understood.
Namen, Identität und Web-Inhalte
Passkeys and crypto wallets: easier login, a new recovery map
The origin-bound credential, the account’s authority and the backup system need separate inspection.
Web-Grundlagen
Password storage: why hashing and encryption serve different jobs
A login service usually needs to verify a password, not recover its original text.
Betrugsmaschen
Peer-to-peer payment reversals
A counterparty buys irreversible crypto with reversible fiat.
Wallets und Sicherheit
Permanent delegates: a control the holder cannot revoke
Mint-level authority changes what holding a token actually means.
Betrugsmaschen
Permit phishing
An offchain signature authorises a token allowance without an immediate gas payment.
Wallets und Sicherheit
Permit2: token approval and downstream signatures are separate permissions
Review the token's allowance to Permit2 and the spender authority granted through Permit2.
Marktstruktur
Perpetual funding: a transfer between position holders
Funding helps align a perpetual contract with its reference market, but it also changes the cost of holding a trade.
Krypto-Geschichte
PlusToken investment scheme
PlusToken marketed a wallet and investment return while authorities described a large pyramid scheme.
KOLs und Werbung
PnL screenshots without cash reconciliation
A screenshot omits deposits, withdrawals, leverage, open losses and failed wallets.