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Document Chain.block_hash at current height #774

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zxq9 merged 2 commits from GH-3002-blockhash_at_current_height into master 2020-10-08 17:48:42 +09:00
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docs/sophia_stdlib.md
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@ -678,7 +678,12 @@ The balance of account `a`.
Chain.block_hash(h : int) : option(bytes(32))
```
The hash of the block at height `h`.
The hash of the block at height `h`. `h` has to be within 256 blocks from the
current height of the chain or else the function will return `None`.
NOTE: In AEVM and FATE VM version 1 `Chain.block_height` was not considered an
allowed height. From FATE VM version 2 (IRIS) it will return the block hash of
the current generation.
#### block_height