Verifiable receipts & invoices

Say "show my receipts" in the chat. Every settled payment — a bounty payout or a marketplace sale — automatically issues a numbered, tamper-evident receipt. On-chain ones carry the real settlement transaction so they’re verifiable on a block explorer. "Show receipt GRX-…" re-checks a receipt’s integrity and on-chain confirmation, and "download the invoice for receipt GRX-…" gives you its PDF. You can also bill anyone with an invoice — say it in chat: “invoice Acme $1,500 for the landing page, due in 30 days”.