When you create a mixing order on Mixerdream (Mix Dream / Dream Mixer BTC), the system generates a Letter of Guarantee — a PGP-signed document proving the deposit address was issued for your specific order.
Because Mixerdream operates with a no-log policy, that letter is your only durable proof of the service commitment. Related hub: letter of guarantee category. Practical order flow: how to use Mixerdream.
Why it matters on a no-log mixer
Without server-side logs, support cannot reconstruct an order from memory. If a mempool delay, amount discrepancy or payout question appears, the letter lets operators validate that your deposit address and payout destinations were genuinely issued by Mixerdream.
In other words: the letter replaces the account history that traditional platforms keep. Losing it is like losing a receipt for a cash purchase.
What the letter typically covers
- Unique deposit address for that order
- PGP signature tied to Mixerdream’s published public key
- Order commitments needed for support claims
- Address lifetime context (deposits remain valid for 45 minutes)
What to do every time
- Download the letter immediately after creating an order
- Verify the signature with the public PGP key
- Confirm the deposit address matches the letter character-for-character
- Keep it until all outputs are received (typically within 6–8 hours after deposit confirmation)
- Include the full letter when contacting support via the contact page
How to verify with PGP
Import Mixerdream’s public key into a client such as Gpg4win, then verify the signed letter file. Only send BTC after the address in the letter matches the on-screen deposit address. Phishing sites rarely publish a matching, long-lived PGP identity.
What a reliable mixer should provide
Prefer services that issue verifiable guarantee letters, publish PGP keys, avoid registration and explain fees clearly. Mixerdream meets these criteria with a 3.5% + 0.0007 BTC fee model, unique deposit addresses per order, optional Precise Payment and a free 0.001 BTC trial.
Common failures
Users sometimes delete the letter, screenshot only the QR, or send BTC before verifying the signature. Any of those mistakes make disputes harder. Treat the letter like a private receipt — offline storage is best. Do not paste the full letter into public chats.
FAQ
Is the letter required for support?
Yes. Without it, a no-log service cannot prove which deposit address belonged to your order.
Can I reuse an old letter?
No. Each Mixerdream order has its own deposit address and letter. Never send to a previous address.