JSON-RPC API Objects

The following objects are parameters for or returned by JSON-RPC Methods.

Block Object

Returned by eth_getBlockByHash and eth_getBlockByNumber.

Key	Type	Value
number	Quantity, Integer	Block number. `null` when block is pending.
hash	Data, 32 bytes	Hash of the block. `null` when block is pending.
parentHash	Data, 32 bytes	Hash of the parent block.
nonce	Data, 8 bytes	Hash of the generated proof of work. `null` when block is pending.
sha3Uncles	Data, 32 bytes	SHA3 of the uncle's data in the block.
logsBloom	Data, 256 bytes	Bloom filter for the block logs. `null` when block is pending.
transactionsRoot	Data, 32 bytes	Root of the transaction trie for the block.
stateRoot	Data, 32 bytes	Root of the final state trie for the block.
receiptsRoot	Data, 32 bytes	Root of the receipts trie for the block.
miner	Data, 20 bytes	Address to which mining rewards were paid.
difficulty	Quantity, Integer	Difficulty for this block.
totalDifficulty	Quantity, Integer	Total difficulty of the chain until this block.
extraData	Data	Extra data field of this block.
size	Quantity, Integer	Size of block in bytes.
gasLimit	Quantity	Maximum gas allowed in this block.
gasUsed	Quantity	Total gas used by all transactions in this block.
timestamp	Quantity	Unix timestamp when block was collated.
transactions	Array	Array of transaction objects, or 32 byte transaction hashes depending on the specified boolean parameter.
uncles	Array	Array of uncle hashes.

Parameter for eth_newFilter and eth_getLogs. Used to filter logs.

Key	Type	Required/Optional	Value
fromBlock	Quantity \| Tag	Optional	Integer block number or `latest`, `pending`, `earliest`. See Block Parameter. Default is `latest`.
toBlock	Quantity \| Tag	Optional	Integer block number or `latest`, `pending`, `earliest`. See Block Parameter. Default is `latest`.
address	Data \| Array	Optional	Contract address or array of addresses from which logs originate.
topics	Array of Data, 32 bytes each	Optional	Array of topics by which to filter logs.

eth_getLogs has an additional key.

Key	Type	Required/Optional	Value
blockhash	Data, 32 bytes	Optional	Hash of block for which to return logs. If `blockhash` is specified, `fromBlock` and `toBlock` cannot be specified.

Log Object

Returned by eth_getFilterChanges and transaction receipt objects can contain an array of log objects.

| Key | Type | Value | |----------------------|-:- :------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | removed | Tag | true when log removed due to chain reorganization. false if valid log. | | logIndex | Quantity, Integer | Log index position in the block. null when log is pending. | | transactionIndex | Quantity, Integer | Index position of transaction from which log was created. null when log is pending. | | transactionHash | Data, 32 bytes | Hash of transaction from which log was created. null when log is pending. | | blockHash | Data, 32 bytes | Hash of block in which log included. null when log is pending. | | blockNumber | Quantity | Number of block in which log included. null when log is pending. | | address | Data, 20 bytes | Address from which log originated. | | data | Data | Non-indexed arguments of log. | | topics | Array of Data, 32 bytes each | Event signature hash and 0 to 3 indexed log arguments. |

Trace Object

Returned by debug_traceTransaction.

Key	Type	Value
gas	Integer	Gas used by the transaction
failed	Boolean	True if transaction failed; otherwise, false
returnValue	String	Bytes returned from transaction execution (without a `0x` prefix)
structLogs	Array	Array of structured log objects

Structured Log Object

Log information returned as part of the Trace object.

Key	Type	Value
pc	Integer	Current program counter
op	String	Current OpCode
gas	Integer	Gas remaining
gasCost	Integer	Cost in wei of each gas unit
depth	Integer	Execution depth
exceptionalHaltReasons	Array	One or more strings representing an error condition that caused the EVM execution to terminate. These indicate that EVM execution terminated for reasons such as running out of gas or attempting to execute an unknown instruction. Generally a single exceptional halt reason is returned but it is possible for more than one to occur at once.
stack	Array of 32 byte arrays	EVM execution stack before executing current operation
memory	Array of 32 byte arrays	Memory space of the contract before executing current operation
storage	Object	Storage entries changed by the current transaction

Transaction Object

Returned by eth_getTransactionByHash, eth_getTransactionByBlockHashAndIndex, and eth_getTransactionsByBlockNumberAndIndex.

Key	Type	Value
blockHash	Data, 32 bytes	Hash of block containing this transaction. `null` when transaction is pending.
blockNumber	Quantity	Block number of block containing this transaction. `null` when transaction is pending.
from	Data, 20 bytes	Address of the sender.
gas	Quantity	Gas provided by the sender.
gasPrice	Quantity	Gas price provided by the sender in Wei.
hash	Data, 32 bytes	Hash of the transaction.
input	Data	Data sent with the transaction.
nonce	Quantity	Number of transactions made by the sender before this one.
to	Data, 20 bytes	Address of the receiver. `null` if a contract creation transaction.
transactionIndex	Quantity, Integer	Index position of transaction in the block. `null` when transaction is pending.
value	Quantity	Value transferred in Wei.
v	Quantity	ECDSA Recovery ID
r	Data, 32 bytes	ECDSA signature r
s	Data, 32 bytes	ECDSA signature s

Transaction Call Object

Parameter for eth_call and eth_estimateGas.

!!!note All parameters are optional for eth_estimateGas

Key	Type	Required/Optional	Value
from	Data, 20 bytes	Optional	Address from which transaction sent.
to	Data, 20 bytes	Required	Address to which transaction is directed.
gas	Quantity, Integer	Optional	Gas provided for the transaction execution. `eth_call` consumes zero gas, but this parameter may be needed by some executions.
gasPrice	Quantity, Integer	Optional	gasPrice used for each paid gas.
value	Quantity, Integer	Optional	Value sent with this transaction.
data	Data	Optional	Hash of the method signature and encoded parameters. For details see Ethereum Contract ABI.

Transaction Receipt Object

Returned by eth_getTransactionReceipt.

Key	Type	Value
blockHash	Data, 32 bytes	Hash of block containing this transaction.
blockNumber	Quantity	Block number of block containing this transaction.
contractAddress	Data, 20 bytes	Contract address created, if contract creation transaction; otherwise, `null`.
cumulativeGasUsed	Quantity	Total amount of gas used by previous transactions in the block and this transaction.
from	Data, 20 bytes	Address of the sender.
gasUsed	Quantity	Amount of gas used by this specific transaction.
logs	Array	Array of log objects generated by this transaction.
logsBloom	Data, 256 bytes	Bloom filter for light clients to quickly retrieve related logs.
status	Quantity	Either `1` (success) or `0` (failure)
to	Data, 20 bytes	Address of the receiver, if sending ether; otherwise, null.
transactionHash	Data, 32 bytes	Hash of the transaction.
transactionIndex	Quantity, Integer	Index position of transaction in the block.

!!!note For pre-Byzantium transactions, the transaction receipt object includes the following instead of status:

Key	Type	Value
root	Data, 32 bytes	Post-transaction stateroot

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