出典確認済みリサーチ: Crypto Exchange Passkey 2FA

Decision outcome: Before changing exchange 2FA, record current method, replacement method, recovery path, device sync scope, hardware-key backup, withdrawal hold side effect, liveness or identity requirement and support channel. Stop if the migration leaves only one inaccessible device, if support moves off-domain, or if a reset would unlock withdrawals faster than the user's risk policy allows.

Evidence snapshot. This article was researched at 2026-09-26T23:43:14.736Z using Gemini Support, Kraken Support, Coinbase Help. A local queue, old draft, search snippet, social repost, price chart or AI summary was not treated as proof. Those surfaces can suggest a question, but every material claim below is tied to the cited source list and claim map.

Verified facts. Claim c1: Gemini says SMS and Authy are being replaced with stronger options such as passkeys, hardware keys or authenticator apps. Claim c2: Gemini says passkey setup can depend on iCloud, Google Password Manager or another password manager for passkeys that work across devices. Claim c3: Kraken says passkeys are bound to a website or app identity and classifies passkeys as roaming or non-roaming device-bound methods. Claim c4: Coinbase says Coinbase One account protection is available to select members who have set up a passkey or security key. These facts are intentionally narrow. They do not prove account eligibility, future availability, execution quality, legal status beyond the cited wording, tax treatment, account approval, support outcome, redemption success, price direction, liquidity depth or platform solvency.

Decision discipline for crypto exchange passkey 2FA migration SMS authenticator security key radar. The useful answer is not a universal winner. It is a source-bound scorecard: which official source answers the immediate question, which control is blank, which blank changes user risk, which test is reversible and which condition reopens the decision. An honest blank is safer than an invented advantage.

FAQ. What is the short answer? Crypto exchanges are moving 2FA from legacy methods toward passkeys, authenticator apps and hardware security keys, but the migration details differ. What should be verified first? Verify the official source and the exact control surface. What should not be inferred? Do not infer eligibility, future support, legal treatment, tax treatment, recovery, execution quality, liquidity, redemption, consumer protection or account approval. When should the user stop? Stop when source, object, user state, permission, route, issuer, jurisdiction or failure handling is unclear.