Have you heard about monero?
Monero is not a typical cryptocurrency made from bitcoin’s source code, it is a cryptocurrency made from scratch which is privacy oriented.
The identity of buyers, sellers, senders and receivers are masked using stealth addresses and ring signatures.
A group of users will each have a key and the ring signature can be signed by any member, not revealing who signed or which key was used for the signature.
The monero extracts a number of public keys from the monero blockchain using triangular distribution and uses your account key to make the ring signature. So from the ring signature an outsider can’t tell which signature belongs to you.
By analysing monero blockchain a flaw was discovered which could reveal the transaction details and the people involved. Even if the issues will be fixed, the details of monero blockchain is out there, available to public. Anyone can access all the transactions that took place under the flawed protocol and decode every single one of transactions.
The only solution is to delete the old transaction details, which by the way is totally against the working principle of blockchain. You can delete stuff from blockchain it is supposed to be immutable and transparent.
There will be security flaws in blockchain systems, in future there will be decrypting tools which can uncover the previous transactions before the new security protocols are brought into action.
The monero users are majority included people who deal with illegal substances who can't afford their transactions to get uncovered.
91 percent of the non-ring monero transactions can be traced. Guess Newest heuristics can be used to identify the mixin with about 80 percent accuracy. The illegal activist who were the early adopters of monero are at a great risk of being unmasked.
Or was monero a trap all along ?