eth2.0-specs/tests/formats/bls/sign.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)
output: BLS Signature -- expected output, single BLS signature or empty.
```
All byte(s) fields are encoded as strings, hexadecimal encoding, prefixed with `0x`.