Checks > Before funding > C-12
A fresh deposit address lets the market attribute an incoming payment to a specific order without you having to label anything. That is convenient and it means an address from last week belongs to last week order rather than to you generally.
The coin is not lost in the sense of being gone. It reached the market. It is simply not attached to the order you wanted funded, which means resolving it requires support and evidence rather than a click. That is recoverable and it is slower and less certain than getting it right the first time.
Open the order, copy from the order screen, send immediately. Do not save deposit addresses in a wallet address book, because the address book is what makes the mistake easy.
nexusb2l7fmqnefwphyy7m5zjhlkytlbo7qbb5lu5dlczr3azgii2gyd.onionnexusma2iqgauqqvjcgds4ckv5xbf272tkfagq4epojjhsgleqpwxiqd.onionnexusabcd6tyfhdwilyitaqiri6tisj2v2hueyjuj6qkvd6azvi5tuqd.onionRun C-07 before you type anything. Open in Tor Browser only, then compare the onion printed on the login screen against your browser address bar. A mismatch means the page is a copy and the tab should be closed.