“Nexus darknet” is search-query phrasing for what the platform itself describes as “Tor hidden service marketplace.” Both descriptions point to the same destination. The access flow is the homepage five-step tutorial regardless of the phrasing that brought you here.
The OpSec advice in the tutorial transfers to other Tor marketplaces with similar architecture (multisig escrow, Monero default, PGP-signed mirrors). The platform-specific bits are the PGP fingerprint, the mirror rotation cadence, and the 2FA setup flow; the rest is general Tor-marketplace OpSec applicable across the sector.
Verified working Nexus Market mirrors
Three v3 onion addresses currently serving the production market, signed under PGP fingerprint 0x7F2A0A9D. Use the Copy button; never retype an address.
Recommended
http://nexuspokkxp4ayqqec3c3lkekwhnjdqur5bqiocemx4t6sy3werqihad.onion
Backup
http://nexusncagw2vnag3ycv62occuouhfgkp6htx7alhnzl5xwgtzi2mfbid.onion
Failover
http://nexusr4ivg23525pvw53h3av7b7xcamxqguprosazaoray33qgrar2qd.onion