Slashing Protection Interchange Tests (EIP-3076)

Tests for EIP-3076:

https://eips.ethereum.org/EIPS/eip-3076

Discussion:

https://ethereum-magicians.org/t/eip-3076-validator-client-interchange-format-slashing-protection/4883

How to run

Each test directory contains an interchange file and some extra data about how to test it.

For example:

{
  "name": "single_validator_genesis_attestation",
  "genesis_validators_root": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "steps": [
    {
      "should_succeed": true,
      "contains_slashable_data": false,
      "interchange": {
        "metadata": {
          "interchange_format_version": "5",
          "genesis_validators_root": "0x0000000000000000000000000000000000000000000000000000000000000000"
        },
        "data": [
          {
            "pubkey": "0xa99a76ed7796f7be22d5b7e85deeb7c5677e88e511e0b337618f8c4eb61349b4bf2d153f649f7b53359fe8b94a38e44c",
            "signed_blocks": [],
            "signed_attestations": [
              {
                "source_epoch": "0",
                "target_epoch": "0"
              }
            ]
          }
        ]
      },
      "blocks": [],
      "attestations": [
        {
          "pubkey": "0xa99a76ed7796f7be22d5b7e85deeb7c5677e88e511e0b337618f8c4eb61349b4bf2d153f649f7b53359fe8b94a38e44c",
          "source_epoch": "0",
          "target_epoch": "0",
          "should_succeed": false
        }
      ]
    }
  ]
}

To run a test, first initialize a new (empty) slashing protection database.

Then for each entry in steps, import the interchange, process the blocks and attestations, and continue to the next step.

Determine the test outcome according to the meanings of each of the fields, which are as follows:

• name: string: the name of the test-case, informational.
• genesis_validators_root: Root: the genesis validators root to use when creating the empty slashing protection database, or to compare the import against.
• steps[i].should_succeed: bool: whether the steps[i].interchange given is valid and should be imported successfully.
• steps[i].contains_slashable_data: bool: whether the steps[i].interchange contains some slashable data with respect to itself or the existing contents of the database.
• steps[i].interchange: Interchange: slashing protection interchange data as described by the spec.
• steps[i].blocks: [object]: a list of block signings to be attempted after importing the interchange, detailed below.
• steps[i].attestations: [object]: a list of attestation signings to be attempted after importing the interchange, detailed below.

Each block in blocks is structured as:

{
  "pubkey": "0xa99a76ed7796f7be22d5b7e85deeb7c5677e88e511e0b337618f8c4eb61349b4bf2d153f649f7b53359fe8b94a38e44c",
  "slot": "1",
  "signing_root": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "should_succeed": false,
  "should_succeed_complete": true
}

Your test-runner should attempt to sign a block with signing_root at the given slot from the given pubkey. The should_succeed field describes whether this signing should be accepted (true) or rejected (false) by a client using a minimal strategy. Clients using a complete strategy should instead use the should_succeed_complete field which allows signing to succeed in more cases. If the block is signed successfully it should be incorporated into the slashing protection database.

Each attestation in attestations is structured as:

{
  "pubkey": "0xa99a76ed7796f7be22d5b7e85deeb7c5677e88e511e0b337618f8c4eb61349b4bf2d153f649f7b53359fe8b94a38e44c",
  "source_epoch": "11",
  "target_epoch": "12",
  "signing_root": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "should_succeed": true,
  "should_succeed_complete": true
}

Similarly to above, your test-runner should attempt to sign an attestation with these parameters using the given pubkey, and succeed based on the value of should_succeed/should_succeed_complete. Again, implementations that use the complete strategy should use should_succeed_complete. All implementations should incorporate signed attestations into the database.

Note that the top-level genesis_validators_root is not necessarily the same as the GVR contained in the interchange, to allow us to test the case where they are mismatched.

Handling Slashable Data

The contains_slashable_data parameter is to be interpreted as follows:

• If should_succeed is false, then contains_slashable_data is irrelevant
• If contains_slashable_data is false, then the given interchange must be imported successfully, and the given block/attestation checks must pass.
• If contains_slashable_data is true, then implementations have the option to do one of two things:
  • Import the interchange successfully, working around the slashable data by minification or some other mechanism. If the import succeeds, all checks must pass and the test should continue to the next step.
  • Reject the interchange (or partially import it), in which case the block/attestation checks and all future steps should be ignored.

Downloading the tests

The tests directory is released as a versioned .tar.gz on the Releases page.

Alternatively, you could use a git submodule.