Timeline
Key dates, payment events and when the issue was discovered.
Start with a concise timeline, transaction type and a list of records you already have. Do not send passwords, wallet seed phrases or private keys.
Emergency and law enforcement: This is not an emergency service or government reporting channel. For immediate danger, contact local emergency services. Consider promptly contacting your bank, exchange and appropriate law-enforcement agency.
Keep the first message limited to what is necessary for scope assessment.
Key dates, payment events and when the issue was discovered.
Transaction IDs, bank references or account statements with unrelated details redacted.
What you need the available records to help establish or clarify.