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Update metadata.rst

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Ayrat Badykov 2019-08-19 14:24:56 +03:00 committed by GitHub
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@ -124,7 +124,7 @@ Encoding of the Metadata Hash in the Bytecode
=============================================
Because we might support other ways to retrieve the metadata file in the future,
the mapping ``{"bzzr0": <Swarm hash>, "solc": <compiler version>}`` is stored
the mapping ``{"bzzr1": <Swarm hash>, "solc": <compiler version>}`` is stored
`CBOR <https://tools.ietf.org/html/rfc7049>`_-encoded. Since the mapping might
contain more keys (see below) and the beginning of that
encoding is not easy to find, its length is added in a two-byte big-endian
@ -132,7 +132,7 @@ encoding. The current version of the Solidity compiler usually adds the followin
to the end of the deployed bytecode::
0xa2
0x65 'b' 'z' 'z' 'r' '0' 0x58 0x20 <32 bytes swarm hash>
0x65 'b' 'z' 'z' 'r' '1' 0x58 0x20 <32 bytes swarm hash>
0x64 's' 'o' 'l' 'c' 0x43 <3 byte version encoding>
0x00 0x32
@ -150,9 +150,9 @@ will instead use a complete version string including commit hash and build date.
are used, the mapping will also contain ``"experimental": true``.
.. note::
The compiler currently uses the "swarm version 0" hash of the metadata,
The compiler currently uses the "swarm version 1" hash of the metadata,
but this might change in the future, so do not rely on this sequence
to start with ``0xa2 0x65 'b' 'z' 'z' 'r' '0'``. We might also
to start with ``0xa2 0x65 'b' 'z' 'z' 'r' '1'``. We might also
add additional data to this CBOR structure, so the
best option is to use a proper CBOR parser.