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Informational JSON-RPC Methods

The following methods return information from a node on a Casper network. The response should be identical, regardless of the node queried, as the information in question is objective and common to all nodes within a network.


chain_get_block

This method returns the JSON representation of a Block from the network.

ParameterTypeDescription
block_identifierObjectThe Block hash or the Block height.
Example chain_get_block request

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

chain_get_block_result

The result from chain_get_block depends on block availability from a given node. If chain_get_block returns an error message that the node does not have information on the given block, you may attempt to get the information from a different node.

ParameterTypeDescription
api_versionStringThe RPC API version.
blockObjectThe Block, if found. (Not required)
Example chain_get_block result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"block": {
"body": {
"deploy_hashes": [],
"proposer": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
"transfer_hashes": [
"5c9b3b099c1378aa8e4a5f07f59ff1fcdc69a83179427c7e67ae0377d94d93fa"
]
},
"hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb",
"header": {
"accumulated_seed": "ac979f51525cfd979b14aa7dc0737c5154eabe0db9280eceaa8dc8d2905b20d5",
"body_hash": "cd502c5393a3c8b66d6979ad7857507c9baf5a8ba16ba99c28378d3a970fff42",
"era_end": {
"era_report": {
"equivocators": [
"013b6a27bcceb6a42d62a3a8d02a6f0d73653215771de243a63ac048a18b59da29"
],
"inactive_validators": [
"018139770ea87d175f56a35466c34c7ecccb8d8a91b4ee37a25df60f5b8fc9b394"
],
"rewards": [
{
"amount": 1000,
"validator": "018a88e3dd7409f195fd52db2d3cba5d72ca6709bf1d94121bf3748801b40f6f5c"
}
]
},
"next_era_validator_weights": [
{
"validator": "016e7a1cdd29b0b78fd13af4c5598feff4ef2a97166e3ca6f2e4fbfccd80505bf1",
"weight": "456"
},
{
"validator": "018a875fff1eb38451577acd5afee405456568dd7c89e090863a0557bc7af49f17",
"weight": "789"
},
{
"validator": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
"weight": "123"
}
]
},
"era_id": 1,
"height": 10,
"parent_hash": "0707070707070707070707070707070707070707070707070707070707070707",
"protocol_version": "1.0.0",
"random_bit": true,
"state_root_hash": "0808080808080808080808080808080808080808080808080808080808080808",
"timestamp": "2020-11-17T00:39:24.072Z"
},
"proofs": [
{
"public_key": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
"signature": "016291a7b2689e2edcc6e79030be50edd02f9bd7d809921ae2654012f808c7b9a0f125bc32d6aa610cbd012395a9832ccfaa9262023339f1db71ca073a13bb9707"
}
]
}
}
}

chain_get_block_transfers

This method returns all successful native transfers within a given Block from a network.

ParameterTypeDescription
block_identifierObjectThe Block hash.
Example chain_get_block_transfers request

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

chain_get_block_transfers_result

ParameterTypeDescription
api_versionStringThe RPC API version.
block_hashObjectThe Block hash, if found.
transfersArrayThe Block's successful transfers, if found.
Example chain_get_block_transfers result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"block_hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb",
"transfers": [
{
"amount": "0",
"deploy_hash": "0000000000000000000000000000000000000000000000000000000000000000",
"from": "account-hash-0000000000000000000000000000000000000000000000000000000000000000",
"gas": "0",
"id": null,
"source": "uref-0000000000000000000000000000000000000000000000000000000000000000-000",
"target": "uref-0000000000000000000000000000000000000000000000000000000000000000-000",
"to": null
}
]
}
}

chain_get_era_summary

This method returns the era summary at a given Block. If you do not specify a block_identifier, you will receive the era summary at the highest state root hash.

ParameterTypeDescription
block_identifierObjectThe Block hash. (Optional)
Example chain_get_era_summary request

{
"id": 1,
"jsonrpc":"2.0",
"method":"chain_get_era_summary",
"params": [
{
"Hash":"9bfa58709058935882a095ca6adf844b72a2ddf0f49b8575ef1ceda987452fb8"
}
]
}

chain_get_era_summary_result

ParameterTypeDescription
api_versionStringThe RPC API version.
era_summaryObjectThe era summary (if found).
Example chain_get_era_summary result

{
"jsonrpc": "2.0",
"id": 1,
"result": {
"api_version": "1.0.0",
"era_summary": {
"block_hash": "9bfa58709058935882a095ca6adf844b72a2ddf0f49b8575ef1ceda987452fb8",
"era_id": 1,
"stored_value": {
"EraInfo": {
"seigniorage_allocations": [
{
"Delegator": {
"delegator_public_key": "01c08939bf1ecd1139448d435989a761c975466d30b96c2dd74e9d23c7b12bc9ff",
"validator_public_key": "01039c258651e04597d786142d9749922245cf44b6cc0c93c58bd6c1783ac3be9b",
"amount": "53472520551166781393617756"
}
},
{
"Validator": {
"validator_public_key": "01039c258651e04597d786142d9749922245cf44b6cc0c93c58bd6c1783ac3be9b",
"amount": "54552773491594393138943367"
}
},
{
"Delegator": {
"delegator_public_key": "01264689a5b4c57dac1088cd0aae8074de105f2269f6041e2c120e80df7a95e6b5",
"validator_public_key": "013e193dec433a73a0b41b924243c62311689648a10b4468f9c609c75674c18726",
"amount": "51312014670568117976319374"
}
},
{
"Validator": {
"validator_public_key": "013e193dec433a73a0b41b924243c62311689648a10b4468f9c609c75674c18726",
"amount": "56713279372733183026458256"
}
},
{
"Delegator": {
"delegator_public_key": "016f571eaf1d3a442e684ecdb31d00a51448dcbaa06d00b340983311f0ba3e76db",
"validator_public_key": "0186d12379939682ae9669b354f7a637ec106369074d567b969cc0e2127c904f12",
"amount": "51852141140784624481333262"
}
},
{
"Validator": {
"validator_public_key": "0186d12379939682ae9669b354f7a637ec106369074d567b969cc0e2127c904f12",
"amount": "56173152902516676521444368"
}
},
{
"Delegator": {
"delegator_public_key": "0161e7ed5c592f16b507b9dd196662b530f9bde6c5b2cfd957fe8d0700ecfbe20b",
"validator_public_key": "01d4cbef55ed9968171102aa136c9564286211ee46c5ab65b6fd68fab5b14d4c4b",
"amount": "52392267611001130986347150"
}
},
{
"Validator": {
"validator_public_key": "01d4cbef55ed9968171102aa136c9564286211ee46c5ab65b6fd68fab5b14d4c4b",
"amount": "55633026432300170016430480"
}
},
{
"Delegator": {
"delegator_public_key": "01b1339a1d114036d84d7b65c804669166d38456114657abbb0e53e67bf1667c60",
"validator_public_key": "01dbce10c8418c21daf16bc1052a486cdb557ba66b09a84605bc1f4b3df364960f",
"amount": "52932394080952975520954950"
}
},
{
"Validator": {
"validator_public_key": "01dbce10c8418c21daf16bc1052a486cdb557ba66b09a84605bc1f4b3df364960f",
"amount": "55092899961808199011606173"
}
}
]
}
},
"state_root_hash": "918abd1973171867e03c1e6e56fd7dd9da35c92461784f9a15c0df23e437d850",
"merkle_proof": "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"
}
}
}

chain_get_state_root_hash

This method returns a state root hash at a given Block. If you do not specify a block_identifier, you will receive the highest state root hash.

ParameterTypeDescription
block_identifierObjectThe Block hash. (Optional)
Example chain_get_state_root_hash request

{
"id": 1,
"jsonrpc": "2.0",
"method": "chain_get_state_root_hash",
"params": [
{
"Height": 10
}
]
}

chain_get_state_root_hash_result

ParameterTypeDescription
api_versionStringThe RPC API version.
state_root_hashStringHex-encoded hash of the state root.
Example chain_get_state_root_hash result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"state_root_hash": "0808080808080808080808080808080808080808080808080808080808080808"
}
}

info_get_deploy

This method retrieves a Deploy from a network. It requires a deploy_hash to query the Deploy.

ParameterTypeDescription
deploy_hashStringThe Deploy hash.
finalized_approvalsBooleanDetermines whether to return the Deploy with the finalized approvals substituted. (Optional)
Example info_get_deploy request

{
"id": 1,
"jsonrpc": "2.0",
"method": "info_get_deploy",
"params": [
"5c9b3b099c1378aa8e4a5f07f59ff1fcdc69a83179427c7e67ae0377d94d93fa",
true
]
}

info_get_deploy_result

The response contains the Deploy and the results of executing the Deploy.

If the execution_results field is empty, it means that the network processed the Deploy, but has yet to execute it. If the network executed the Deploy, it will return the results of the execution. The execution results contain the Block hash which contains the Deploy.

ParameterTypeDescription
api_versionStringThe RPC API version.
deployObjectThe Deploy.
execution_resultsArrayAn array of execution results with Block hashes.
Example info_get_deploy result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"deploy": {
"approvals": [
{
"signature": "014c1a89f92e29dd74fc648f741137d9caf4edba97c5f9799ce0c9aa6b0c9b58db368c64098603dbecef645774c05dff057cb1f91f2cf390bbacce78aa6f084007",
"signer": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c"
}
],
"hash": "5c9b3b099c1378aa8e4a5f07f59ff1fcdc69a83179427c7e67ae0377d94d93fa",
"header": {
"account": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
"body_hash": "d53cf72d17278fd47d399013ca389c50d589352f1a12593c0b8e01872a641b50",
"chain_name": "casper-example",
"dependencies": [
"0101010101010101010101010101010101010101010101010101010101010101"
],
"gas_price": 1,
"timestamp": "2020-11-17T00:39:24.072Z",
"ttl": "1h"
},
"payment": {
"StoredContractByName": {
"args": [
[
"amount",
{
"bytes": "e8030000",
"cl_type": "I32",
"parsed": 1000
}
]
],
"entry_point": "example-entry-point",
"name": "casper-example"
}
},
"session": {
"Transfer": {
"args": [
[
"amount",
{
"bytes": "e8030000",
"cl_type": "I32",
"parsed": 1000
}
]
]
}
}
},
"execution_results": [
{
"block_hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb",
"result": {
"Success": {
"cost": "123456",
"effect": {
"operations": [
{
"key": "account-hash-2c4a11c062a8a337bfc97e27fd66291caeb2c65865dcb5d3ef3759c4c97efecb",
"kind": "Write"
},
{
"key": "deploy-af684263911154d26fa05be9963171802801a0b6aff8f199b7391eacb8edc9e1",
"kind": "Read"
}
],
"transforms": [
{
"key": "uref-2c4a11c062a8a337bfc97e27fd66291caeb2c65865dcb5d3ef3759c4c97efecb-007",
"transform": {
"AddUInt64": 8
}
},
{
"key": "deploy-af684263911154d26fa05be9963171802801a0b6aff8f199b7391eacb8edc9e1",
"transform": "Identity"
}
]
},
"transfers": [
"transfer-5959595959595959595959595959595959595959595959595959595959595959",
"transfer-8282828282828282828282828282828282828282828282828282828282828282"
]
}
}
}
]
}
}

query_global_state

This method allows for you to query for a value stored under certain keys in global state. You may query using either a Block hash or state root hash.

  • Note: Querying a purse's balance requires the use of state_get_balance rather than any iteration of query_global_state.
ParameterTypeDescription
state_identifierObjectThe identifier used for the query.
keyStringcasper_types::Key as a formatted string.
pathArrayThe path components starting from the key as base.
Example query_global_state request

{
"id": 1,
"jsonrpc": "2.0",
"method": "query_global_state",
"params": [
"deploy-af684263911154d26fa05be9963171802801a0b6aff8f199b7391eacb8edc9e1",
[],
{
"BlockHash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb"
}
]
}

query_global_state_result

ParameterTypeDescription
api_versionStringThe RPC API version.
block_headerObjectThe Block header if a Block hash was provided. (Not required)
stored_valueObjectThe stored value.
merkle_proofStringThe merkle proof.
Example query_global_state result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"block_header": {
"accumulated_seed": "ac979f51525cfd979b14aa7dc0737c5154eabe0db9280eceaa8dc8d2905b20d5",
"body_hash": "cd502c5393a3c8b66d6979ad7857507c9baf5a8ba16ba99c28378d3a970fff42",
"era_end": {
"era_report": {
"equivocators": [
"013b6a27bcceb6a42d62a3a8d02a6f0d73653215771de243a63ac048a18b59da29"
],
"inactive_validators": [
"018139770ea87d175f56a35466c34c7ecccb8d8a91b4ee37a25df60f5b8fc9b394"
],
"rewards": [
{
"amount": 1000,
"validator": "018a88e3dd7409f195fd52db2d3cba5d72ca6709bf1d94121bf3748801b40f6f5c"
}
]
},
"next_era_validator_weights": [
{
"validator": "016e7a1cdd29b0b78fd13af4c5598feff4ef2a97166e3ca6f2e4fbfccd80505bf1",
"weight": "456"
},
{
"validator": "018a875fff1eb38451577acd5afee405456568dd7c89e090863a0557bc7af49f17",
"weight": "789"
},
{
"validator": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
"weight": "123"
}
]
},
"era_id": 1,
"height": 10,
"parent_hash": "0707070707070707070707070707070707070707070707070707070707070707",
"protocol_version": "1.0.0",
"random_bit": true,
"state_root_hash": "0808080808080808080808080808080808080808080808080808080808080808",
"timestamp": "2020-11-17T00:39:24.072Z"
},
"merkle_proof": "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",
"stored_value": {
"Account": {
"account_hash": "account-hash-e94daaff79c2ab8d9c31d9c3058d7d0a0dd31204a5638dc1451fa67b2e3fb88c",
"action_thresholds": {
"deployment": 1,
"key_management": 1
},
"associated_keys": [
{
"account_hash": "account-hash-e94daaff79c2ab8d9c31d9c3058d7d0a0dd31204a5638dc1451fa67b2e3fb88c",
"weight": 1
}
],
"main_purse": "uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-007",
"named_keys": []
}
}
}
}

state_get_account_info

This method returns a JSON representation of an Account from the network. The block_identifier must refer to a Block after the Account's creation, or the method will return an empty response.

ParameterTypeDescription
public_keyStringThe public key of the Account.
block_identifierObjectThe Block identifier.
Example state_get_account_info request

{
"id": 1,
"jsonrpc": "2.0",
"method": "state_get_account_info",
"params": [
{
"Hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb"
},
"013b6a27bcceb6a42d62a3a8d02a6f0d73653215771de243a63ac048a18b59da29"
]
}

state_get_account_info_result

ParameterTypeDescription
api_versionStringThe RPC API version.
accountObjectA JSON representation of the Account structure.
merkle_proofStringThe merkle proof.
Example state_get_account_info result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"account": {
"account_hash": "account-hash-e94daaff79c2ab8d9c31d9c3058d7d0a0dd31204a5638dc1451fa67b2e3fb88c",
"action_thresholds": {
"deployment": 1,
"key_management": 1
},
"associated_keys": [
{
"account_hash": "account-hash-e94daaff79c2ab8d9c31d9c3058d7d0a0dd31204a5638dc1451fa67b2e3fb88c",
"weight": 1
}
],
"main_purse": "uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-007",
"named_keys": []
},
"api_version": "1.4.13",
"merkle_proof": "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"
}
}

state_get_balance

This method returns a purse's balance from a network. The request takes in the formatted representation of a purse URef as a parameter.

To query for the balance of an Account, you must provide the formatted representation of the Account's main purse URef, which can be obtained from the state_get_account_info response. The response contains the balance of a purse in motes.

For instance, one native layer-1 token of the Casper Mainnet CSPR is comprised of 1,000,000,000 motes. On a different Casper network, the representation of token-to-motes may differ.

ParameterTypeDescription
state_root_hashStringThe hash of state root.
purse_urefStringFormatted URef.
Example state_get_balance request

{
"id": 1,
"jsonrpc": "2.0",
"method": "state_get_balance",
"params": [
"uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-007",
"0808080808080808080808080808080808080808080808080808080808080808"
]
}

state_get_balance_result

ParameterTypeDescription
api_versionStringThe RPC API version.
balance_valueStringThe balance value in motes.
merkle_proofStringThe merkle proof.
Example state_get_balance result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"balance_value": "123456",
"merkle_proof": "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"
}
}

state_get_dictionary_item

This method returns an item from a Dictionary. Every dictionary has a seed URef, findable by using a dictionary_identifier. The address of a stored value is the blake2b hash of the seed URef and the byte representation of the dictionary key.

You may query a stored value directly using the dictionary address.

ParameterTypeDescription
state_root_hashStringHash of the state root.
dictionary_identifierObjectThe Dictionary query identifier.
Example state_get_dictionary_item request

{
"id": 1,
"jsonrpc": "2.0",
"method": "state_get_dictionary_item",
"params": [
{
"URef": {
"dictionary_item_key": "a_unique_entry_identifier",
"seed_uref": "uref-09480c3248ef76b603d386f3f4f8a5f87f597d4eaffd475433f861af187ab5db-007"
}
},
"0808080808080808080808080808080808080808080808080808080808080808"
]
}

### `state_get_dictionary_item_result`
ParameterTypeDescription
api_versionStringThe RPC API version.
dictionary_keyStringThe key under which the value is stored.
stored_valueObjectThe stored value.
merkle_proofStringThe merkle proof.
Example state_get_dictionary_item result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"dictionary_key": "dictionary-67518854aa916c97d4e53df8570c8217ccc259da2721b692102d76acd0ee8d1f",
"merkle_proof": "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",
"stored_value": {
"CLValue": {
"bytes": "0100000000000000",
"cl_type": "U64",
"parsed": 1
}
}
}
}


Node Informational JSON-RPC Methods

The following methods return information from a node on a Casper network. The responses return information specific to the queried node, and as such, will vary.


info_get_peers

This method returns a list of peers connected to the node.

Example info_get_peers request

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

info_get_peers_result

ParameterTypeDescription
api_versionStringThe RPC API version.
peersArrayThe node ID and network address of each connected peer.
Example info_get_peers result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"peers": [
{
"address": "127.0.0.1:54321",
"node_id": "tls:0101..0101"
}
]
}
}

info_get_status

This method returns the current status of a node.

Example info_get_status request

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

info_get_status_result

ParameterTypeDescription
api_versionStringThe RPC API version.
build_versionStringThe compiled node version.
chainspec_nameStringThe chainspec name, used to identify the currently connected network.
last_added_block_infoObjectThe minimal info of the last Block from the linear chain.
next_upgradeObjectInformation about the next scheduled upgrade.
our_public_signing_keyStringOur public signing key.
peersArrayThe node ID and network address of each connected peer.
round_lengthIntegerThe next round length if this node is a validator. A round length is the amount of time it takes to reach consensus on proposing a Block.
starting_state_root_hashStringThe state root hash used at the start of the current session.
uptimeIntegerTime that passed since the node has started.
Example info_get_status result

{
"id": 1,
"jsonrpc": "2.0",
"result": {
"api_version": "1.4.13",
"build_version": "1.4.13-c8db6a737-casper-mainnet",
"chainspec_name": "casper-example",
"last_added_block_info": {
"creator": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
"era_id": 1,
"hash": "13c2d7a68ecdd4b74bf4393c88915c836c863fc4bf11d7f2bd930a1bbccacdcb",
"height": 10,
"state_root_hash": "0808080808080808080808080808080808080808080808080808080808080808",
"timestamp": "2020-11-17T00:39:24.072Z"
},
"next_upgrade": {
"activation_point": 42,
"protocol_version": "2.0.1"
},
"our_public_signing_key": "01d9bf2148748a85c89da5aad8ee0b0fc2d105fd39d41a4c796536354f0ae2900c",
"peers": [
{
"address": "127.0.0.1:54321",
"node_id": "tls:0101..0101"
}
],
"round_length": "1m 5s 536ms",
"starting_state_root_hash": "0202020202020202020202020202020202020202020202020202020202020202",
"uptime": "13s"
}
}