6 blocks, not 6 clients. The chances of catching up to the block with the transactions that is buried 6 blocks deep is slim. Granted of course that the dishonest party has not a very significant part (say less than 15% or so) of the hashing power. These changes can be calculated using Poisson distribution, as done in Satoshi's original paper.

6 blocks, not 6 clients. The chances of catching up to the block with the transactions that is buried 6 blocks deep is slim. Granted of course that the dishonest party has not a very significant part (say less than 15% or so) of the hashing power. These changes can be calculated using Poisson distribution, as done in Satoshi's original paper (last pages).

6 blocks, not 6 clients. The chances of catching up to the block with the transactions that is buried 6 blocks deep is slim. Granted of course that the dishonest party has not a very significant part (say less than 30% or so) of the hashing power. These changes can be calculated using Poisson distribution, as done in Satoshi's original paper.

6 blocks, not 6 clients. The chances of catching up to the block with the transactions that is buried 6 blocks deep is slim. Granted of course that the dishonest party has not a very significant part (say less than 15% or so) of the hashing power. These changes can be calculated using Poisson distribution, as done in Satoshi's original paper.