Bitcoin Mixer PGP Guarantee Letter: How ₿MIX Uses Cryptographic Trust Instead of Institutional Trust

One of the most important trust mechanisms in Bitcoin privacy services is often overlooked: how does a user confirm that the service's commitments are real and binding before sending funds? ₿MIX solves this with a PGP-signed guarantee letter issued automatically with every transaction.

What the Guarantee Letter Contains

The guarantee letter is a document generated automatically when you create a ₿MIX transaction. It contains the deposit address, the return address you specified, the transaction parameters including fee and delivery window, and ₿MIX's processing commitments. This letter is then cryptographically signed with ₿MIX's private PGP key.

What PGP Signing Actually Proves

A valid PGP signature proves two things: first, that the letter was signed by the holder of the ₿MIX private key — confirming the deposit address was generated by ₿MIX's server, not a phishing site or intermediary; second, that the letter has not been altered since it was signed — any modification invalidates the signature. This is mathematical proof, not a policy claim.

How to Verify in Under 2 Minutes

• Windows: Gpg4win + Kleopatra → import key (fingerprint: B8A5 CFCA F63F F2D8 384A 6B12 D3B2 8095 6F0E 7CAF) → right-click file → Verify
• Android: OpenKeychain → import key by fingerprint → share file → Verify
• Online: bitlist.co/pgp → paste letter → instant result
Save the letter before sending funds. If any issue arises, provide the letter to ₿MIX support — the blockchain confirms the transfer, the letter confirms the commitment. The combination resolves any dispute without requiring any party's memory or manual record-keeping.