I want to use action context information, such as block hash code, to generate number as "random" numbers in smart contract.
But I can't find any interface to get block hash code.
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If you are looking to generate random numbers in your smart contract, take a look at this discussion: eosio.stackexchange.com/questions/41/…– John HaagerCommented May 14, 2018 at 17:52
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@JohnHaager thank you so much for the link, the discussion is really helpful!– ofoCommented May 16, 2018 at 9:43
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1 Answer
Block information isn't directly available. These two functions provide information from a user-selected previous block:
int tapos_block_num();
int tapos_block_prefix();
There are a couple problems with relying on these:
- They are from a block in the past
- The person who created the transaction filled these by selecting a block and copying the values
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Thank you! Now I can get the block number and then save to table. My App can fetch the block number and then get the subsequent 15 (or more) blocks' information. I have another quesiton: What's the meaning of block prefix? What's it for?– ofoCommented May 16, 2018 at 13:51