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Monitoring and Consuming Events

Casper platform uses event streaming to notify state changes in smart contracts and nodes. A node on a Casper network streams events through the SSE (Server Sent Event) server. The default configuration of the Casper node provides event streaming via the port specified as the event_stream_server.address in the node's config.toml, which is by default 9999 for nodes on Testnet and Mainnet.

Event Types​

There are three types of event streams in our platform categorized based on the emitting endpoint of the nodes. Those are:

Deploy events

These are associated with Deploys on a node. Currently, only DeployAccepted event is emitted . Refer to the Deploys section to discover more about Deploys and their life cycles.

Finality Signature event

This event indicates that the final approvals from validators are signed and further alterations to the block will not be allowed. Refer to the consensus reached section and block finality section to learn more about finality signatures.

Main events

All the events other than DeployAccepted and FinalitySignature fall under this type. Those are ApiVersion, BlockAdded, DeployProcessed, DeployExpired, Fault, Step, and Shutdown events.

How to monitor the event stream?​

You can start watching the event stream details using a simple Curl call as in the below format:

curl -s http://<HOST:PORT>/events/<ENDPOINT>
  • HOST - The IP address of a peer on the network
  • PORT - The port 9999 (The default port number for nodes on Mainnet or Testnet)
  • ENDPOINT - The specific endpoint of the node which the event will be emitted

Refer to the serialization standard page to get details on required custom serializations and the types page to find definitions of the terms used in the event stream output.

Monitoring DeployAccepted Event​

You can start watching the event stream for the DeployAccepted event or any other events being emitted on this endpoint using the following command. Replace the HOST field with the peer IP address.

curl -sN http://<HOST>:9999/events/deploys

DeployAccepted event details

The URL to consume the Deploy-related events is http://<HOST>:9999/events/deploys.

The event stream server of the node emits this event when a Deploy has been received by the node.

The following example contains the JSON representation of the DeployAccepted event structure.

Expand the below section to view the DeployAccepted event details:
data: {
"DeployAccepted":
    {
      "hash":"99483863a391510b8d3447dd5cfc446b42d65e598672d569abc4cdded85b81e6",
      "header":
        {"account":"01e35e1904034db6c0bb48c6d88826a2bcf27f29f67a13d844b82aab04614f83f4",
        "timestamp":"2022-06-22T13:41:41.581Z",
        "ttl":"30m",
        "gas_price":1,
        "body_hash":"eb53a7db7c29f9b6101797167302e5977dbe53cb5ee9b9ae961e3418d95aeb1c",
        "dependencies":[],
        "chain_name":"casper-net-1"
        },
      "payment":
        {"ModuleBytes":
          {"module_bytes":"",
          "args":[["amount",{"cl_type":"U512","bytes":"0400f90295","parsed":"2500000000"}]]
          }
        },
      "session":
        {"Transfer":
          {
            "args":[["amount",{"cl_type":"U512","bytes":"0400f90295","parsed":"2500000000"}],
                ["target",{"cl_type":{"ByteArray":32},"bytes":"b33d857b45a2280d846c50cb3ad76850e2125012c2ba6a814957f48d68052334","parsed":"b33d857b45a2280d846c50cb3ad76850e2125012c2ba6a814957f48d68052334"}],
                ["id",{"cl_type":{"Option":"U64"},"bytes":"010100000000000000","parsed":1}]]
          }
        },
      "approvals":
        [{"signer":"01e35e1904034db6c0bb48c6d88826a2bcf27f29f67a13d844b82aab04614f83f4","signature":"0105aa48ff49e0202d0b4c17ca449ccd6ba30ae80fed5e60503eb34eab7a8aab11893502b7856946cdafcc1966dcbe656b3cab06f0396829484edd14b6ffb94f08"}
        ]
    }
}
id:506

You can find the definitions of the terms in the above DeployAccepted JSON representation by referring to the following links:

  • Deploy - Contains the serialization details of a Deploy with other related details like Deploy- Hash, Deploy-Header, Payment and Session, Approval.
  • Types - Contains the definitions of the terms in the event stream output.

Monitoring FinalitySignature Event​

You can start watching the event stream for the FinalitySignature event or any other events being emitted on this endpoint using the following command. Replace the HOST field with the peer IP address.

curl -sN http://<HOST>:9999/events/sigs

FinalitySignatures event details

The URL to consume the FinalitySignature event is http://<HOST>:9999/events/sigs.

The FinalitySignature event is emitted whenever a new finality signature is received.

The following example contains the JSON representation of the FinalitySignature event structure.

Expand the below section to view the FinalitySignature event details:
data:
 {
   "FinalitySignature":
    {
     "block_hash":"abbcdc782a18a9ba31826b07c838a69a6b790c8b36a0fd5f0818f757834d82f5",
     "era_id":11,
     "signature":"01d45c16e488c3e16bb1e1134f9a92fb42492498ab2233a643a159281ea8a2a497edd19b6ae56f70c32c12f0341a9ded719033285db17c614337e363fdd8e41f05",
     "public_key":"01601bda04ea125e2ca1881e817c46403b32862eb053370e0b93adad220378578a"
     }
 }
id:696
  • block_hash - A cryptographic hash that is used to identify a Block.
  • era_id - The period of time used to specify when specific events in a blockchain network occur.
  • signature - A serialized byte representation of a cryptographic signature.
  • public_key - A hexadecimal-encoded cryptographic public key.

Monitoring Other Events​

All the events apart from DeployAccepted and FinalitySignature are emitted on the endpoint main with the URL http://<HOST>:9999/events/main. Use the below command to monitor those event streams:

curl -sN http://<HOST>:9999/events/main

Further details of each event are presented in the following sections.

ApiVersion event​

ApiVersion is always the first event emitted when a new client connects to the SSE server. It specifies the API version of the server. The ApiVersion is the protocol version of a node on the Casper platform.

The following example contains the JSON representation of the ApiVersion event structure.

Expand the below section to view the ApiVersion event details:
data:{"ApiVersion":"1.0.0"}

BlockAdded event​

BlockAdded event is emitted whenever a new block is added to the blockchain and stored locally in the node.

The following example contains the JSON representation of the BlockAdded event structure.

Expand the below section to view the BlockAdded event details:
data:
{
   "BlockAdded":
    {
       "block_hash":"5809c6aacc3ac0573a67677743f4cb93cd487ade1c5132c1f806f75b6248f35f",
       "block":
        {
          "hash":"5809c6aacc3ac0573a67677743f4cb93cd487ade1c5132c1f806f75b6248f35f",
          "header":
           {
            "parent_hash":"997d2f23c0a70ecca18043eab2f2f4fdef47fceba96519145b8e5d44609c4f80",
            "state_root_hash":"48ec6b9cc41ec36f7424b3b1d24fcc4dfe96d7e01e2196c9f45879a1a8d4b996",
            "body_hash":"03a5a5e40042f904fd2f307085c07f9774d17f9ee17fc3ef23ed5485dfff972d",
            "random_bit":true,
            "accumulated_seed":"9200c4ac43deda1dd5a8ca91ec37ce33df0ef06bd82d94314bbb961e9e6501f7",
            "era_end":null,
            "timestamp":"2022-06-22T13:42:37.824Z",
            "era_id":9,
            "height":97,
            "protocol_version":"1.0.0"
           },
          "body":
            {
               "proposer":"01601bda04ea125e2ca1881e817c46403b32862eb053370e0b93adad220378578a",
               "deploy_hashes":[],
               "transfer_hashes":[]
            },
          "proofs":[]
        }
     }
  }
id:594
  • block_hash - A cryptographic hash that is used to identify a Block.
  • block - The JSON representation of the Block.

DeployProcessed event​

DeployProcessed event is emitted when a given Deploy has been executed.

The following example contains the JSON representation of the DeployProcessed event structure.

Expand the below section to view the DeployProcessed event details:
data:
{
  "DeployProcessed":
  {
    "deploy_hash":"99483863a391510b8d3447dd5cfc446b42d65e598672d569abc4cdded85b81e6",
    "account":"01e35e1904034db6c0bb48c6d88826a2bcf27f29f67a13d844b82aab04614f83f4",
    "timestamp":"2022-06-22T13:41:41.581Z",
    "ttl":"30m",
    "dependencies":[],
    "block_hash":"f19e3b63678ca5aa9fa8b30377275c83f8c1a041902b38ce7f4de50f02dbf396",
    "execution_result":
     {
      "Success":\
      {
       "effect":
        {
         "operations":[],
         "transforms":
        [
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"account-hash-b33d857b45a2280d846c50cb3ad76850e2125012c2ba6a814957f48d68052334","transform":"Identity"},
          {"key":"account-hash-b33d857b45a2280d846c50cb3ad76850e2125012c2ba6a814957f48d68052334","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-d7173acc018f9330f28ded58e4bf5e955239e87b55d2b1709ff39c300b7fe602","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"hash-c805d90bb64f02a3a530f951a85bc8cacd586da8abee586f790e9d6037ebbb1b","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"balance-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8","transform":"Identity"},
          {"key":"balance-389c8be6728248c03b39a316b40e4d5202c01bdb4db969c1c6839a7772ec1ed6","transform":"Identity"},
          {"key":"balance-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8",
            "transform":
              {
                "WriteCLValue":
                {
                  "cl_type":"U512",
                  "bytes":"0e001f0afa095bc138938d44c64d31",
                  "parsed":"999999999999999999999999900000000"
                }
              }
          },
          {"key":"balance-389c8be6728248c03b39a316b40e4d5202c01bdb4db969c1c6839a7772ec1ed6","transform":
           {"AddUInt512":"100000000"}
          },
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"account-hash-b33d857b45a2280d846c50cb3ad76850e2125012c2ba6a814957f48d68052334","transform":"Identity"},
          {"key":"account-hash-b33d857b45a2280d846c50cb3ad76850e2125012c2ba6a814957f48d68052334","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},{"key":"hash-d7173acc018f9330f28ded58e4bf5e955239e87b55d2b1709ff39c300b7fe602","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"hash-c805d90bb64f02a3a530f951a85bc8cacd586da8abee586f790e9d6037ebbb1b","transform":"Identity"},{"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"balance-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8","transform":"Identity"},
          {"key":"balance-389c8be6728248c03b39a316b40e4d5202c01bdb4db969c1c6839a7772ec1ed6","transform":"Identity"},
          {"key":"balance-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8","transform":
           {"WriteCLValue":
            {"cl_type":"U512",
            "bytes":"0e001f0afa095bc138938d44c64d31",
            "parsed":"999999999999999999999999900000000"
            }
           }
          },
          {"key":"balance-389c8be6728248c03b39a316b40e4d5202c01bdb4db969c1c6839a7772ec1ed6","transform":
           {"AddUInt512":"100000000"
           }
          },
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"hash-c805d90bb64f02a3a530f951a85bc8cacd586da8abee586f790e9d6037ebbb1b","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"balance-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8","transform":"Identity"},
          {"key":"balance-1aa4fb6dd0b0c11cf2f7881e5260d38691f37e6049cb6b9c22d5de5663feac9d","transform":"Identity"},
          {"key":"balance-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8","transform":
           {"WriteCLValue":
            {"cl_type":"U512",
             "bytes":"0e00260765095bc138938d44c64d31",
             "parsed":"999999999999999999999997400000000"
            }
           }
          },
          {"key":"balance-1aa4fb6dd0b0c11cf2f7881e5260d38691f37e6049cb6b9c22d5de5663feac9d","transform":
           {"AddUInt512":"2500000000"
           }
          },
          {"key":"transfer-dc0fa2fefc399e2e0b3256d6c3fda78cd459e3f55cd07e7ebad1d785613f6a7c","transform":
           {"WriteTransfer":
            {"deploy_hash":"99483863a391510b8d3447dd5cfc446b42d65e598672d569abc4cdded85b81e6",
             "from":"account-hash-3bcdf5f3ed95e9d617ae8f864590acf992f97fcf7135d79cf050d8ff983d59d3",
             "to":"account-hash-b33d857b45a2280d846c50cb3ad76850e2125012c2ba6a814957f48d68052334",
             "source":"uref-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8-007",
             "target":"uref-1aa4fb6dd0b0c11cf2f7881e5260d38691f37e6049cb6b9c22d5de5663feac9d-004",
             "amount":"2500000000",
             "gas":"0",
             "id":1
            }
           }
          },
          {"key":"deploy-99483863a391510b8d3447dd5cfc446b42d65e598672d569abc4cdded85b81e6","transform":
           {"WriteDeployInfo":
             {"deploy_hash":"99483863a391510b8d3447dd5cfc446b42d65e598672d569abc4cdded85b81e6",
              "transfers":["transfer-dc0fa2fefc399e2e0b3256d6c3fda78cd459e3f55cd07e7ebad1d785613f6a7c"],
              "from":"account-hash-3bcdf5f3ed95e9d617ae8f864590acf992f97fcf7135d79cf050d8ff983d59d3",
              "source":"uref-f615b98575d7f728efadaa8e2326ecf8a11303856178378033cc3ca7f7ba83c8-007",
              "gas":"100000000"
             }
            }
          },
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-d7173acc018f9330f28ded58e4bf5e955239e87b55d2b1709ff39c300b7fe602","transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"balance-389c8be6728248c03b39a316b40e4d5202c01bdb4db969c1c6839a7772ec1ed6",
          "transform":"Identity"},
          {"key":"hash-f2aaa28affc32affd0fb9d23e6b525ed786f934fdb58bf1d3f45edf28f244ec9","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"hash-c805d90bb64f02a3a530f951a85bc8cacd586da8abee586f790e9d6037ebbb1b","transform":"Identity"},
          {"key":"hash-eef70c80ed9bc625d4bc0106f2c21f3445cdb9e8bbacffb1f6d18b49b7e646ca","transform":"Identity"},
          {"key":"balance-389c8be6728248c03b39a316b40e4d5202c01bdb4db969c1c6839a7772ec1ed6","transform":"Identity"},
          {"key":"balance-fca9f7cb7cf68cd4fe6969bf089f56341ff5c35dbec649d9353c3989e5a91ade","transform":"Identity"},
          {"key":"balance-389c8be6728248c03b39a316b40e4d5202c01bdb4db969c1c6839a7772ec1ed6","transform":
            {"WriteCLValue":
             {"cl_type":"U512",
              "bytes":"00",
              "parsed":"0"
             }
            }
          },
          {"key":"balance-fca9f7cb7cf68cd4fe6969bf089f56341ff5c35dbec649d9353c3989e5a91ade","transform":
            {"AddUInt512":"100000000"
            }
          }
        ]
      },
    "transfers":
     ["transfer-dc0fa2fefc399e2e0b3256d6c3fda78cd459e3f55cd07e7ebad1d785613f6a7c"],
      "cost":"100000000"
    }
   }
  }
}
id:598
  • deploy_hash - The cryptographic hash of a Deploy.
  • account - A structure that represents a user on a Casper network.
  • timestamp - A timestamp type, representing a concrete moment in time.
  • ttl - A time difference between two timestamps.
  • dependencies - A list of Deploy hashes.
  • block_hash - A cryptographic hash that is used to identify a Block.
  • execution_result - The result of executing a single deploy.

DeployExpired event​

DeployExpired event is emitted when a Deploy becomes no longer valid to be executed or added to a block due to their times to live (TTLs) expiring.

The following example contains the JSON representation of the DeployExpired event structure.

Expand the below section to view the DeployExpired event details:
data:
{
  "DeployExpired":
   {
    "deploy_hash":"7ecf22fc284526c6db16fb6455f489e0a9cbf782834131c010cf3078fb9be353"
   }
}
id:887

Fault event​

The Fault event is emitted if there is a validator error.

The following example contains the JSON representation of the Fault event structure.

Expand the below section to view the Fault event details:
data:
{
  "Fault":
    {
      "era_id":4591448806312642506,
      "public_key":"012fa85eb06279da42e68530e1116be04bfd2aaa5ed8d63401ebff4d9153a609a9",
      "timestamp":"2020-08-07T01:26:58.364Z"
    }
}
  • era_id - The period of time used to specify when specific events in a blockchain network occur.
  • public_key - A hexadecimal-encoded cryptographic public key.
  • timestamp - A timestamp type, representing a concrete moment in time.

Step event​

Step event is emitted at the end of every era and contains the execution effects produced by running the auction contract's step function.

The following example contains the JSON representation of the Step event structure.

Expand the below section to view the Step event details:
data:
 {"Step":
  {
    "era_id":1,
    "execution_effect":
     {"operations":[],
     "transforms":
      [
        {"key":"hash-044a0f52a3e5aa4496bff42382484f9b520831b80443ef89a322c26ae6774603","transform":"Identity"},
        {"key":"hash-044a0f52a3e5aa4496bff42382484f9b520831b80443ef89a322c26ae6774603","transform":"Identity"},
        {"key":"hash-6689f9e923d385f5dfbdc10c82d2423f36d31f8ae41ac33e28b46660f8d756a1","transform":"Identity"},
        {"key":"hash-044a0f52a3e5aa4496bff42382484f9b520831b80443ef89a322c26ae6774603","transform":"Identity"},
        {"key":"uref-f268de37fcea55f8fb1abeba8536a1cc041b2aed2691f1cf34aeaaf0ae379aa5-000","transform":"Identity"}
        ,
        {"key":"uref-cd76df3a576309a282541b62f9fe6d106e6abc1bfa75eaa74b1b63da5f505195-000","transform":"Identity"}
        ,{"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"},
        {"key":"hash-f7826252f74e69ccb17f6a1ca08e5bd5b04ffb6e3de204881b21b91b75578f1c","transform":"Identity"},
        {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"},
        {"key":"uref-b8c0eae40513588ff2832cc9aec3949736482e95575ec132817e43e758772293-000","transform":"Identity"}
        ,{"key":"uref-53df18bf01396fbd1ef3a8757c7bdffc684c407d90f2cfeebff166db1d923613-000","transform":"Identity"},
        {"key":"uref-f268de37fcea55f8fb1abeba8536a1cc041b2aed2691f1cf34aeaaf0ae379aa5-000","transform":"Identity"}
        ,
        {"key":"bid-278e5af1ca6cddf5d5438999cb072b47f0d65e1484799f692c3c9c40304be30e","transform":"Identity"},
        {"key":"bid-278e5af1ca6cddf5d5438999cb072b47f0d65e1484799f692c3c9c40304be30e","transform":
         {"WriteBid":
          {"validator_public_key":"0133eaae2821f090ac3ba0eadc0a897742094c0604df72b465c41d4b773298a7b9",
          "bonding_purse":"uref-136552c255d4d737bf7e43d2be250f9f38691b9fe5d9e34446bff18d6d1cf984-007",
          "staked_amount":"1000000000000005",
          "delegation_rate":5,
          "vesting_schedule":
           {"initial_release_timestamp_millis":1664475057182,
            "locked_amounts":null
           },
           "delegators":
            {"012a241eaa9fa3bd6ccb0e0aaaf4658538f3540e04e2f58973614a168f2f2f813d":
             {"delegator_public_key":"012a241eaa9fa3bd6ccb0e0aaaf4658538f3540e04e2f58973614a168f2f2f813d",
             "staked_amount":"51312014671568117976319379",
             "bonding_purse":"uref-c5ad00f9e6b2f2631ca647ad188187e63799a278a0a46ca25f6b4da64d556662-007",
             "validator_public_key":"0133eaae2821f090ac3ba0eadc0a897742094c0604df72b465c41d4b773298a7b9",
             "vesting_schedule":
              {"initial_release_timestamp_millis":1664475057182,
              "locked_amounts":null
              }
             }
            },
            "inactive":false
           }
          }
        },
        {"key":"bid-278e5af1ca6cddf5d5438999cb072b47f0d65e1484799f692c3c9c40304be30e","transform":"Identity"},
        {"key":"bid-278e5af1ca6cddf5d5438999cb072b47f0d65e1484799f692c3c9c40304be30e","transform":
         {
          "WriteBid":
          {
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            "bonding_purse":"uref-136552c255d4d737bf7e43d2be250f9f38691b9fe5d9e34446bff18d6d1cf984-007",
            "staked_amount":"56713279373733183026458261",
            "delegation_rate":5,
            "vesting_schedule":
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              "locked_amounts":null
             },
             "delegators":
             {"012a241eaa9fa3bd6ccb0e0aaaf4658538f3540e04e2f58973614a168f2f2f813d":
              {
              "delegator_public_key":"012a241eaa9fa3bd6ccb0e0aaaf4658538f3540e04e2f58973614a168f2f2f813d",
              "staked_amount":"51312014671568117976319379",
              "bonding_purse":"uref-c5ad00f9e6b2f2631ca647ad188187e63799a278a0a46ca25f6b4da64d556662-007",
              "validator_public_key":"0133eaae2821f090ac3ba0eadc0a897742094c0604df72b465c41d4b773298a7b9",
              "vesting_schedule":
               {"initial_release_timestamp_millis":1664475057182,
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              }
             },
             "inactive":false
          }
         }
        },
        {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"},
        {"key":"hash-f7826252f74e69ccb17f6a1ca08e5bd5b04ffb6e3de204881b21b91b75578f1c","transform":"Identity"},
        {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"},
        {"key":"balance-136552c255d4d737bf7e43d2be250f9f38691b9fe5d9e34446bff18d6d1cf984","transform":"Identity"},
        {"key":"balance-136552c255d4d737bf7e43d2be250f9f38691b9fe5d9e34446bff18d6d1cf984","transform":
         {"AddUInt512":"56713279372733183026458256"}
        },
        {"key":"uref-b8c0eae40513588ff2832cc9aec3949736482e95575ec132817e43e758772293-000","transform":
         {"AddUInt512":"56713279372733183026458256"}
        },
        {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"},
        {"key":"hash-f7826252f74e69ccb17f6a1ca08e5bd5b04ffb6e3de204881b21b91b75578f1c","transform":"Identity"},
        {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"},
        {"key":"balance-c5ad00f9e6b2f2631ca647ad188187e63799a278a0a46ca25f6b4da64d556662","transform":"Identity"},
        {"key":"balance-c5ad00f9e6b2f2631ca647ad188187e63799a278a0a46ca25f6b4da64d556662","transform":
        {"AddUInt512":"51312014670568117976319374"}
        },
        {"key":"uref-b8c0eae40513588ff2832cc9aec3949736482e95575ec132817e43e758772293-000","transform":
         {"AddUInt512":"51312014670568117976319374"}
        },
        {"key":"bid-d46667cb14c87f508064a87577e5687c97f1a09292a2f9fa7d2af8db2aca79cd","transform":"Identity"},
        {"key":"bid-d46667cb14c87f508064a87577e5687c97f1a09292a2f9fa7d2af8db2aca79cd","transform":
         {"WriteBid":
          {"validator_public_key":"01383e13ca5587745b54bade75e947cfe81293d5477d659708dd1d6fb744882931",
          "bonding_purse":"uref-3f92eb17ebd3503ffe1c642ae078b3397710dae0b4050ab369315032427d0281-007",
          "staked_amount":"1000000000000001",
          "delegation_rate":1,
          "vesting_schedule":
           {"initial_release_timestamp_millis":1664475057182,
           "locked_amounts":null
           },
          "delegators":
           {"0134811b4d572d84f289a576f110ad49aa8bb984235b2bf1cb47a0c2f7e4391bef":
            {"delegator_public_key":"0134811b4d572d84f289a576f110ad49aa8bb984235b2bf1cb47a0c2f7e4391bef",
            "staked_amount":"53472520552166781393617757",
            "bonding_purse":"uref-5918746f209867d13c2ddb73b04b8ffc0f7d788445571978ef198d3a9b985c7b-007",
            "validator_public_key":"01383e13ca5587745b54bade75e947cfe81293d5477d659708dd1d6fb744882931",
            "vesting_schedule":
             {"initial_release_timestamp_millis":1664475057182,
             "locked_amounts":null
             }
            }
           },
           "inactive":false
           }
          }},
          {"key":"bid-d46667cb14c87f508064a87577e5687c97f1a09292a2f9fa7d2af8db2aca79cd","transform":"Identity"},
          {"key":"bid-d46667cb14c87f508064a87577e5687c97f1a09292a2f9fa7d2af8db2aca79cd","transform":
           {"WriteBid":
           {"validator_public_key":"01383e13ca5587745b54bade75e947cfe81293d5477d659708dd1d6fb744882931",
           "bonding_purse":"uref-3f92eb17ebd3503ffe1c642ae078b3397710dae0b4050ab369315032427d0281-007",
           "staked_amount":"54552773492594393138943368",
           "delegation_rate":1,
           "vesting_schedule":
            {"initial_release_timestamp_millis":1664475057182,
            "locked_amounts":null
            },
            "delegators":
             {"0134811b4d572d84f289a576f110ad49aa8bb984235b2bf1cb47a0c2f7e4391bef":
              {"delegator_public_key":"0134811b4d572d84f289a576f110ad49aa8bb984235b2bf1cb47a0c2f7e4391bef",
               "staked_amount":"53472520552166781393617757",
               "bonding_purse":"uref-5918746f209867d13c2ddb73b04b8ffc0f7d788445571978ef198d3a9b985c7b-007",
               "validator_public_key":"01383e13ca5587745b54bade75e947cfe81293d5477d659708dd1d6fb744882931",
               "vesting_schedule":
               {"initial_release_timestamp_millis":1664475057182,"locked_amounts":null}
              },
              "inactive":false
             }
            }},
            {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"}
            ,{"key":"hash-f7826252f74e69ccb17f6a1ca08e5bd5b04ffb6e3de204881b21b91b75578f1c","transform":"Identity"},
            {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"}
            ,{"key":"balance-3f92eb17ebd3503ffe1c642ae078b3397710dae0b4050ab369315032427d0281","transform":"Identity"},
            {"key":"balance-3f92eb17ebd3503ffe1c642ae078b3397710dae0b4050ab369315032427d0281","transform":{"AddUInt512":"54552773491594393138943367"}},
            {"key":"uref-b8c0eae40513588ff2832cc9aec3949736482e95575ec132817e43e758772293-000","transform":{"AddUInt512":"54552773491594393138943367"}},
            {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"}
            ,
            {"key":"hash-f7826252f74e69ccb17f6a1ca08e5bd5b04ffb6e3de204881b21b91b75578f1c","transform":"Identity"}
            ,
            {"key":"hash-e629178843b4ed182d51db1fa07f43fb5d21fc43c95d547dfd84b82c8b517d1b","transform":"Identity"}
            ,
            {"key":"balance-5918746f209867d13c2ddb73b04b8ffc0f7d788445571978ef198d3a9b985c7b","transform":"Identity"},
            {"key":"balance-5918746f209867d13c2ddb73b04b8ffc0f7d788445571978ef198d3a9b985c7b","transform":{"AddUInt512":"53472520551166781393617756"}},
            {"key":"uref-b8c0eae40513588ff2832cc9aec3949736482e95575ec132817e43e758772293-000","transform":{"AddUInt512":"53472520551166781393617756"}},
            {"key":"bid-2cf608f36591a31d31190f87e994c93a60078a401d34bb938f26d407d159ddfa","transform":"Identity"},
            {"key":"bid-2cf608f36591a31d31190f87e994c93a60078a401d34bb938f26d407d159ddfa","transform":
             {"WriteBid":
              {
               "validator_public_key":"013d3fb7e3ceac62a900d7e868db0a4c3c8bde6dce873c3f06bf50638d91422857",
              "bonding_purse":"uref-ba36249da22aedc3850ce0bb8839ef850d916b816560160cfe7b64d32dad3870-007",
              "staked_amount":"1000000000000004",
              "delegation_rate":4,
              "vesting_schedule":
               {
                "initial_release_timestamp_millis":1664475057182,
                "locked_amounts":null},
                "delegators":
                 {"01bd050d6229789059571b51df753bb8beb883fde2fd727183574291d938187016":
                  {"delegator_public_key":"01bd050d6229789059571b51df753bb8beb883fde2fd727183574291d938187016",
                  "staked_amount":"51852141141784624481333266",
                  "bonding_purse":"uref-ab81a8a4823cbb1d3214e6eaaa5db1cd80d3a47c0d5c2297aa57f65e338f1646-007",
                  "validator_public_key":"013d3fb7e3ceac62a900d7e868db0a4c3c8bde6dce873c3f06bf50638d91422857",
                  "vesting_schedule":
                   {"initial_release_timestamp_millis":1664475057182,
                   "locked_amounts":null
                   }
                  }
                 },
                 "inactive":false
               }
              }
            },
            {"key":"bid-2cf608f36591a31d31190f87e994c93a60078a401d34bb938f26d407d159ddfa","transform":"Identity"},{"key":"bid-2cf608f36591a31d31190f87e994c93a60078a401d34bb938f26d407d...
  • era_id - The period of time is used to specify when specific events in a blockchain network will occur.
  • execution_effect - The journal of execution transforms from a single Deploy.
  • operations - Operations performed while executing a deploy.
  • transform - The actual transformation performed while executing a deploy.

Shutdown event​

The Shutdown event is emitted when the node is about to shut down, usually for an upgrade. This causes a termination of the event stream since the server is shutting down.

The following example contains the JSON representation of the Shutdown event structure.

Expand the below section to view the Shutdown event details:
data:"Shutdown"
id:1107

Replay Event Stream​

This command will replay the event stream from an old event onwards. Replace HOST, EVENT_TYPE, and ID fields with the values of your scenario.

curl -sN http://<HOST>:9999/events/<EVENT_TYPE>?start_from=<ID>

Example:

curl -sN http://65.21.235.219:9999/events/main?start_from=29267508

Each URL can have a query string added to the form ?start_from=<ID>, where ID is an integer representing an old event ID. With this query, you can replay the event stream from that old event onwards. If you specify an event ID that has already been purged from the cache, the server will replay all the cached events.

note

The server keeps only a limited number of events cached to allow replaying the stream to clients using the ?start_from= query string. The cache size can be set differently on each node using the event_stream_buffer_length value in the config.toml. By default, it is only 5000. The intended use case is to allow a client consuming the event stream that loses its connection to reconnect and hopefully catch up with events that were emitted while it was disconnected.

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