Proof-of-Stake JSON-RPC Methods

The following methods pertain to the Proof-of-Stake functionality of a Casper network. They return information related to auctions, bids and validators. This information is necessary for users involved with node operations and validation.

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state_get_auction_info

This method returns the bids and validators as of either a specific Block (by height or hash). If you do not provide a block_identifier, state_get_auction_info will return information from the most recent Block.

Parameter	Type	Description
block_identifier	Object	The Block identifier.

Example state_get_auction_info request

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "state_get_auction_info",
  "params": [
    {
      "Hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb"
    }
  ]
}

state_get_auction_info_result

Parameter	Type	Description
api_version	String	The RPC API version.
auction_state	Object	The auction state.

Example state_get_auction_info result

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "api_version": "1.4.13",
    "auction_state": {
      "bids": [
        {
          "bid": {
            "bonding_purse": "uref-fafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafafa-007",
            "delegation_rate": 0,
            "delegators": [],
            "inactive": false,
            "staked_amount": "10"
          },
          "public_key": "01197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61"
        }
      ],
      "block_height": 10,
      "era_validators": [
        {
          "era_id": 10,
          "validator_weights": [
            {
              "public_key": "01197f6b23e16c8532c6abc838facd5ea789be0c76b2920334039bfa8b3d368d61",
              "weight": "10"
            }
          ]
        }
      ],
      "state_root_hash": "0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b"
    }
  }
}

info_get_validator_changes

This method returns status changes of active validators. Listed changes occurred during the EraId contained within the response itself. A validator may show more than one change in a single era.

Potential change types:

Change Type	Description
Added	The validator has been added to the set.
Removed	The validator has been removed from the set.
Banned	The validator has been banned in the current era.
CannotPropose	The validator cannot propose a Block.
SeenAsFaulty	The validator has performed questionable activity.

Example info_get_validator_changes request

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "info_get_validator_changes",
  "params": []
}

info_get_validator_changes_result

If no changes occurred in the current era, info_get_validator_changes will return empty.

Parameter	Type	Description
api_version	String	The RPC API version.
changes	Object	The validators' status changes.

Example info_get_validator_changes result

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "api_version": "1.4.13",
    "changes": [
      {
        "public_key": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
        "status_changes": [
          {
            "era_id": 1,
            "validator_change": "Added"
          }
        ]
      }
    ]
  }
}

chain_get_era_info_by_switch_block

This method returns an EraInfo from the network. Only the last Block in an era, known as a switch block, will contain an era_summary.

Parameter	Type	Description
block_identifier	Object	The Block identifier. If you do not supply a block_identifier, the returned information will be the most recent Block. (Optional)

Example chain_get_era_info_by_switch_block request

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "chain_get_era_info_by_switch_block",
  "params": [
    {
      "Hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb"
    }
  ]
}

chain_get_era_info_by_switch_block_result

Parameter	Type	Description
api_version	String	The RPC API version.
era_summary	Object	The era summary (If found).

Example chain_get_era_info_by_switch_block

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "api_version": "1.4.13",
    "era_summary": {
      "block_hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb",
      "era_id": 42,
      "merkle_proof": "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",
      "state_root_hash": "0808080808080808080808080808080808080808080808080808080808080808",
      "stored_value": {
        "EraInfo": {
          "seigniorage_allocations": [
            {
              "Delegator": {
                "amount": "1000",
                "delegator_public_key": "01e1b46a25baa8a5c28beb3c9cfb79b572effa04076f00befa57eb70b016153f18",
                "validator_public_key": "012a1732addc639ea43a89e25d3ad912e40232156dcaa4b9edfc709f43d2fb0876"
              }
            },
            {
              "Validator": {
                "amount": "2000",
                "validator_public_key": "012a1732addc639ea43a89e25d3ad912e40232156dcaa4b9edfc709f43d2fb0876"
              }
            }
          ]
        }
      }
    }
  }
}