Is there a decentralized zk-SNARK?

Is there a decentralized zk-SNARK?

Normally, in zk-SNARK, we need to generate two public keys: one for prover and one for verifier. However, the input parameter of this generator algorithm must be secret, meaning that it must be hidden for both prover and verifier.

And because of this, the process of those public generation is done by a trusted third party.

Since using a trusted third party is not desirable for decentralized blockchain, I am looking for a decentralized approach of those public key generation. Is there ? or it's impossible to have a decentralized zk-SNARK ?

P.S. More information about zk-SNARK is found here: https://media.consensys.net/introduction-to-zksnarks-with-examples-3283b554fc3b

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