# The Solidity Language

æternity has limited support for the Solidity language bytecode and ABI. There\
are a number of test cases and some scaffolding code. However, it is not mature\
enough to be part of consensus and thus the Solidity ABI is not allowed on\
chain.

For a full description of Solidity see [The Solidity Specification](https://solidity.readthedocs.io).

## The Solidity\_01 ABI

Note that the Solidity\_01 ABI specifies that the create contract initial call\
returns the actual bytecode to be stored in the contract state tree to be used\
for future calls.

See [The Solidity Specification:ABI](https://solidity.readthedocs.io/en/develop/abi-spec.html)

### Storing the contract state

Contracts store the VM storage map containing 256 bit binaries for both keys\
and values in the MPT. Undefined keys are treated as having the value 0 and\
keys bound to the value zero are stored as the empty binary, thus purging them\
from the tree.


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