Building Blockchain Projects

Setting the proof type and storage location

Whether you need the TLSNotary proof from Oraclize or not, you have to specify the proof type and proof storage location before making queries.

If you don't want proof, then put this code in your contract:

oraclize_setProof(proofType_NONE)

And if you want proof, then put this code in your contract:

oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS)

Currently, proofStorage_IPFS is the only proof storage location available; that is, TLSNotary proof is only stored in IPFS.

You may execute any of these methods just once, for instance, in the constructor or at any other time if, for instance, you need the proof for certain queries only.