eth2.0-specs/specs/test_formats/bls/sign_msg.md

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# Test format: BLS sign message
Message signing with BLS should produce a signature.
## Test case format
The test data is declared in a `data.yaml` file:
```yaml
input:
privkey: bytes32 -- the private key used for signing
message: bytes32 -- input message to sign (a hash)
domain: bytes8 -- the BLS domain
output: bytes96 -- expected signature
```
All byte(s) fields are encoded as strings, hexadecimal encoding, prefixed with `0x`.
## Condition
The `sign_msg` handler should sign the given `message`, with `domain`, using the given `privkey`, and the result should match the expected `output`.