Clean Bitcoin Transaction History: What AML Score 0–25% Actually Means and Why It Matters
"Clean bitcoin transaction history" is used frequently in the Bitcoin mixing space, often without clear definition. Understanding what it means — technically, practically, and in the context of exchange compliance — is worth establishing precisely. The difference between coins that qualify as clean and coins that don't is the difference between smooth exchange deposits and compliance reviews that freeze access to funds.
What AML Score Means and How It Works
AML risk scoring in the cryptocurrency context is a quantitative assessment of a coin's transaction history. Analytics firms maintain large databases of flagged addresses: darknet marketplaces, sanctioned entities, high-risk exchanges, mixer inputs and outputs, scam-associated wallets. When a coin's transaction history includes exposure to these flagged categories, the coin receives a higher AML risk score.
The score is expressed as a percentage. Industry convention treats 0–25% as the range accepted by major regulated exchanges for standard deposit processing. Coins above that threshold may trigger additional review. Coins significantly above — 75%+ — are typically rejected or frozen pending compliance investigation.
What "Exchange-Sourced" Means
DreadPirate's guarantee specifies that output BTC is issued from exchange accounts with AML 0–25% and no links to the user. "Exchange-sourced" means the coins originate from accounts at regulated cryptocurrency exchanges — not darknet marketplaces, not high-risk counterparties, not previously flagged wallets. The entire upstream transaction history of the output coin traces to legitimate, regulated exchange activity. This is distinct from what many mixers offer: coins pooled from arbitrary sources that may themselves carry elevated AML scores.
Tainted Coins vs Clean Coins: The Practical Difference
A coin with tainted history carries detectable links to high-risk activity somewhere in its transaction graph. Chain analysis tools trace several hops backward and assign risk based on the proportion of value that has passed through flagged addresses. Practical consequences: a deposit to a major exchange triggers a compliance flag. The exchange freezes the deposit pending review. The user must respond to information requests. The outcome can include return of funds after extended delay, permanent account restriction, or regulatory referral.
Clean coins — AML 0–25%, exchange-sourced — clear compliance screening without triggering these outcomes. The deposit is treated as standard.
DreadPirate's AML Output Guarantee in Practice
DreadPirate accepts coins of any AML level and origin as input. The output — whether clean BTC or Monero — is sourced from exchange accounts with AML 0–25% and no connection to the user's original address. The mixing process severs the on-chain link between input and output through a proprietary in-house engine. The AML guarantee is stated in the PGP-signed Letter of Guarantee per transaction — not a marketing claim but a written, cryptographically verifiable commitment to the specific quality of the output coins.
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