Nexus Entrance / Board index /Before you decide
Nexus addresses three doors, one platform behind them

Your account, balance and orders are the same through all three. Copy rather than retype, and check the signature once you are through.

Door A nexusb2l73qzjn4slhyfxa3jvpolw7fomiz5sgyyefnsdhikaqgborqd.onion
Door B nexusma2iegzo7atzwbrwxhcdopyri3vare2twibldnlc3txqjdeb5yd.onion
Door C nexusabcd6xxpjuftr7i3uohealsg64xtgwrmznkfh3o3rkcf3raxead.onion

An address that opens is not an address that is genuine. The check that settles it takes under a minute.

Words

Defined as used here, which is not always how they are used elsewhere.

TermMeaning
v3 onion addressFifty six characters of base32 plus the suffix, computed from a public key. Not assigned by anyone, cannot be seized, and proves nothing about who runs it.
DescriptorThe signed record a hidden service publishes so clients can find it. Publishing fails routinely, which is the usual reason an address goes quiet for an hour.
CircuitThe path your client builds through relays. A bad one produces failures identical to a service being down, which is why a new circuit is always the first thing to try.
FingerprintA short hash of a public key, comparable by eye. The thing you pin. The key file itself is disposable.
Vanity generationGenerating keypairs repeatedly until an address starts with chosen characters. Cheap for a short prefix, impossible for a whole address, and the reason forgeries match the opening.
ReplayPresenting a genuine old signed statement as if it were current. Signatures never expire, so this works unless you read the date inside the signed text.
RotationRetiring addresses and introducing new ones with an overlap where both work. Routine, and never announced with a deadline.
Grace windowThat overlap, which exists so an occasional visitor sees old and new at once and can update what they saved.
Two of three multisigAn escrow contract where funds move only when two of buyer, vendor and platform sign. The platform key is a tiebreaker, not a veto.
SubaddressA one time destination a wallet issues per payment, so two payments cannot be linked by where they went. Reusing one defeats the purpose.
Ring signatureHides which input was actually spent among decoys, which is what conceals the sender on the Monero chain.
The boundaryWhere money converts from something with a record into something without one. Where nearly all real world privacy is lost, and not on the chain.
Rate limitingSlowing or refusing a connection based on behaviour, since a hidden service cannot see identity. It looks identical to rejection, which causes a lot of confusion.
InterstitialThe checking your browser screen. It protects the service from automated load and provides you no protection at all.

Terms this site avoids

Dark web, which names no network and describes nothing technical. Deep web, which means anything not indexed by a search engine and is mostly bank statements and intranets. Both appear in search queries, so they turn up in a page title or two here, and neither is used in an explanation because neither is precise enough to build an argument on.