The level of sheer brilliance by some members of this forum never ceases to amaze me - and I do mean that, I hope we can discuss Pine's suggestion at length another time.Having said this to go back to the OP's comments there are several legal and practical barriers which prevent a seller keeping a list of addresses as insurance being a real worry.In the first instance, there's the usual issue of how a seller would come to the attention of LEO. Vendors are not stupid and make sure to use mixers and pseudonymous methods to withdraw their proceeds. As such, an analysis of the block chain would almost certainly fail to link their identity to a specific vendor account.Let's say for argument's sake though a vendor were to luck out and LEO decided to raid their premises on the basis of large amounts of funds showing up in their bank account or they're spotted on a security camera shipping off some drugs at a Post Office.The first barrier for LEO to overcome in this instance is that most vendors are prepared for this possibility and have encrypted any incriminating information on their hard drives and (hopefully!) hidden any equipment related to manufacturing narcotics. Let's say once again this is a very imprudent seller and they actually do keep commercial quantities of controlled drugs at their address, LEO would already have enough to convict them - there'd be no need to marry up this information with a vendor's clients as ownership of the drugs themselves would be a crime.However, let's assume once again our imprudent seller is at the mercy of an extremely overzealous LE Agent who wants to cover all their bases and tries to force them to hand over the password to their machine as well as their seller ID on Silk Road.Even if the seller cooperates and doesn't "Pleade the Fifth" as you say in America, if they're smart enough to keep a list of addresses as insurance, they will probably also be smart enough to keep that list in a separate place in order to use it as a bargaining chip.However, let's go further into the realms of improbability yet again and assume it is somehow in the seller's interests to admit to having sold drugs as well as possessing them and hands over a list of addresses, our overzealous LEO Agent still has very little to go on.Firstly, there's no way he can know whether the list the seller has just handed him as some sort of plea bargain really represents former clients or simply has been ripped from a phone directory. Let's say though the LEO has everyone on the list arrested and interviewed. A check of their bank records might well show that these people have bought Bitcoins but it would be a far cry from this to satisfy the local DA / CPS that this proved they had bought a specific amount of drugs on a given date as would be required in order to bring charges. The list of course would relate to historic transactions so the drugs themselves would have been long since consumed!So as you see, the only scenario in which a buyer would be at risk is if the seller was some kind of consummate masochist who wanted to incriminate themselves further, and had handed over not only the passwords to access their machine but their ID and password for SR and PGP private keys too - it seems a touch implausible!V.