Blockchain Inspection

NOTE All other debug namespace APIs EXCEPT FOR the following APIs are restricted with rpc.unsafe-debug.disable flag:

• VM Tracing APIs, however with limited functionality (only pre-defined tracers are allowed)

• debug_dumpBlock, debug_dumpStateTrie, debug_getBlockRlp, debug_getModifiedAccountsByHash, debug_getModifiedAccountsByNumber, debug_getBadBlocks, debug_getModifiedStorageNodesByNumber

• debug_metrics

debug_dumpBlock

Retrieves the state that corresponds to the block number and returns a list of accounts (including storage and code).

NOTE: This function correctly returns the state for a few latest, currently 4, block numbers. Retrieving older block state is restricted depending on the value set for the command-line option --state.block-interval (default: 128). This means that the function performs the state retrieval against only the block numbers that are multiples of state.block-interval. For example, when state.block-interval is 128, this function returns the state for the block numbers "0x0", "0x80", "0x100", "0x180", and so on. If the block number is not a multiple of state.block-interval, it returns 'missing trie node' error.

Client	Method Invocation
Console	debug.dumpBlock(number)
RPC	{"method": "debug_dumpBlock", "params": [number]}

Parameters

Name	Type	Description
block number or hash	QUANTITY | TAG | HASH	Integer or hexadecimal block number, or the string "earliest", "latest" or "pending" as in the default block parameter, or block hash.

NOTE: In versions earlier than Klaytn v1.7.0, only hex string type is available.

Return Value

Type	Description
JSON string	The block information.

Example

Console

> debug.dumpBlock("0x80")
{
  accounts: {
    0000000000000000000000000000000000000035: {
      balance: "12800000000000000000",
      code: "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",
      codeHash: "62b00472fac99d94ccc52f5addac43d54c129cd2c6d2357c9557abea67efdec5",
      nonce: 0,
      root: "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
      storage: {}
    },
    /...(skipped).../
      codeHash: "3f34b5d7038ae652086ba4847ede2668b26a50107c5258d1412f764b942e2661",
      nonce: 1,
      root: "56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
      storage: {}
    }
  },
  root: "70383c826d1161ec2f12d799023317d8da7775dd47b8502d2d7ef646d094d3a5"
}

> debug.dumpBlock("0x81")
Error: missing trie node a573119868e0898fe5526732a079dd713c005fcbcce38dec5cae75af0378e4d3 (path )
    at web3.js:3239:20
    at web3.js:6447:15
    at web3.js:5181:36
    at <anonymous>:1:1

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_dumpBlock","params":["0x80"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":{"root":"70383c826d1161ec2f12d799023317d8da7775dd47b8502d2d7ef646d094d3a5","accounts":{"0000000000000000000000000000000000000035":{"balance":"12800000000000000000","nonce":0,"root":"56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421","codeHash":"62b00472fac99d94ccc52f5addac43d54c129cd2c6d2357c9557abea67efdec5","code":"6080604052600436106100615763ffffffff7c01000000000000000000000000000000000000000000000000000000006000350416631a39d8ef81146100805780636353586b146100a757806370a08231146100ca578063fd6b7ef8146100f8575b3360009081526001602052604081208054349081019091558154019055005b34801561008c57600080fd5b5061009561010d565b60408051918252519081900360200190f35b6100c873ffffffffffffffffffffffffffffffffffffffff60043516610113565b005b3480156100d657600080fd5b5061009573ffffffffffffffffffffffffffffffffffffffff60043516610147565b34801561010457600080fd5b506100c8610159565b60005481565b73ffffffffffffffffffffffffffffffffffffffff1660009081526001602052604081208054349081019091558154019055565b60016020526000908152604090205481565b336000908152600160205260408120805490829055908111156101af57604051339082156108fc029083906000818181858888f193505050501561019c576101af565b3360009081526001602052604090208190555b505600a165627a7a723058201307c3756f4e627009187dcdbc0b3e286c13b98ba9279a25bfcc18dd8bcd73e40029","storage":{}},...(skipped)...}}}

debug_dumpStateTrie

Retrieves all state/storage tries of the given state root.

Client	Method Invocation
Console	debug.dumpStateTrie(number)
RPC	{"method": "debug_dumpStateTrie", "params": [number]}

Parameters

Name	Type	Description
number	int	The block number.

Return Value

Type	Description
JSON string	Dump state Trie result

Example

Console

> debug.dumpStateTrie(10)
{
    root: "70383c826d1161ec2f12d799023317d8da7775dd47b8502d2d7ef646d094d3a5",
    tries: [...]
}

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_dumpStateTrie","params":["0x80"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":{"root":"70383c826d1161ec2f12d799023317d8da7775dd47b8502d2d7ef646d094d3a5","tries":[...]}}

debug_getBlockRlp

Retrieves and returns the RLP-encoded block by the block number.

Client	Method Invocation
Console	debug.getBlockRlp(number)
RPC	{"method": "debug_getBlockRlp", "params": [number]}

References: RLP

Parameters

Name	Type	Description
block number or hash	QUANTITY | TAG | HASH	Integer or hexadecimal block number, or the string "earliest", "latest" or "pending" as in the default block parameter, or block hash.

NOTE: In versions earlier than Klaytn v1.7.0, only integer type is available.

Return Value

Type	Description
string	The RLP-encoded block.

Example

Console

> debug.getBlockRlp(100)
"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"

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_getBlockRlp","params":['200'],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":"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"}

debug_getModifiedAccountsByHash

Returns all accounts that have changed between the two blocks specified by their block hashes. Changes made in endBlockHash are included, but changes made in startBlockHash are not. If endBlockHash is not given, it returns the accounts modified in the startBlockHash. A change is defined as a difference in nonce, balance, code hash, or storage hash.

Client	Method Invocation
Console	debug.getModifiedAccountsByNumber(startBlockHash, endBlockHash)
RPC	{"method": "debug_getModifiedAccountsByNumber", "params": [startBlockHash, endBlockHash]}

Parameters

Name	Type	Description
startBlockHash	32-byte DATA	The first block hash of the range to check.
endBlockHash	32-byte DATA	(optional) The last block hash of the range.

Return Value

Type	Description
JSON string	The list of addresses modified between the given range.

Example

Console

> debug.getModifiedAccountsByHash("0x583a02df4222c82d4ffe5d3658d0f7ac233f4dc5de83f6430d74199038b606b6", "0x69833f0fc012dc36be910aa6909f5395cd35136dbeae29ed2170a7d4162a009c")

["0x31b93ca83b5ad17582e886c400667c6f698b8ccd", "0xb7fe15c42e66bd71835b07dc6e7daee7729f6235", "0xe31a0edb11357dba71377e625fc6174da4ef4321", "0x16b11cf9c2186a117b0da38315b42b1eaa03bbe5", "0xd3ec3c7e4cad042dbdcb6a7e0fdbc55a92276f12", "0xa4e0d726ce51572e66295756ad93206592c43a59", "0xf65e07b6626ab43ecea744803fa46bd4a89bfdb6", "0xaac56dfe44f9894d4f536cd17acfbc44bf81a843", "0x3855407fa65c4c5104648b3a9e495072df62b585", "0x61a7cbdd597848494fa85cbb76f9c63ad9c06cad", "0xa4845491cb0dad5bd6707a33c02af0d9db435c15", "0x026e8f70a26b6e5c8bec25e23869846edfdd6728", "0x3cf3e8caea91501321feee0f0692fcd98f1c6292", "0x18822790d7baf2fa6bbca6ad8baa46985abeb81b"]

HTTP RPC

curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_getModifiedAccountsByHash","params":["0x583a02df4222c82d4ffe5d3658d0f7ac233f4dc5de83f6430d74199038b606b6", "0x69833f0fc012dc36be910aa6909f5395cd35136dbeae29ed2170a7d4162a009c"],"id":1}' https://public-en-baobab.klaytn.net

{"jsonrpc":"2.0","id":1,"result":["0x31b93ca83b5ad17582e886c400667c6f698b8ccd","0xb7fe15c42e66bd71835b07dc6e7daee7729f6235","0xe31a0edb11357dba71377e625fc6174da4ef4321","0x16b11cf9c2186a117b0da38315b42b1eaa03bbe5","0xd3ec3c7e4cad042dbdcb6a7e0fdbc55a92276f12","0xa4e0d726ce51572e66295756ad93206592c43a59","0xf65e07b6626ab43ecea744803fa46bd4a89bfdb6","0xaac56dfe44f9894d4f536cd17acfbc44bf81a843","0x3855407fa65c4c5104648b3a9e495072df62b585","0x61a7cbdd597848494fa85cbb76f9c63ad9c06cad","0xa4845491cb0dad5bd6707a33c02af0d9db435c15","0x026e8f70a26b6e5c8bec25e23869846edfdd6728","0x3cf3e8caea91501321feee0f0692fcd98f1c6292","0x18822790d7baf2fa6bbca6ad8baa46985abeb81b"]}

debug_getModifiedAccountsByNumber

Returns all accounts that have changed between the two blocks specified by their block numbers. Changes made in endBlockNum are included, but changes made in startBlockNum are not. If endBlockNum is not given, it returns the accounts modified in the startBlockNum. A change is defined as a difference in nonce, balance, code hash, or storage hash.

Client	Method Invocation
Console	debug.getModifiedAccountsByNumber(startBlockNum, endBlockNum)
RPC	{"method": "debug_getModifiedAccountsByNumber", "params": [startBlockNum, endBlockNum]}

Parameters

Name	Type	Description
startBlockNum	int	The first block number of the range to check.
endBlockNum	int	(optional) The last block number of the range.

Return Value

Type	Description
JSON string	The list of addresses modified between the given range.

Example

Console

> debug.getModifiedAccountsByNumber(171904, 172160)
["0x31b93ca83b5ad17582e886c400667c6f698b8ccd", "0xb7fe15c42e66bd71835b07dc6e7daee7729f6235", "0xe31a0edb11357dba71377e625fc6174da4ef4321", "0x16b11cf9c2186a117b0da38315b42b1eaa03bbe5", "0xd3ec3c7e4cad042dbdcb6a7e0fdbc55a92276f12", "0xa4e0d726ce51572e66295756ad93206592c43a59", "0xf65e07b6626ab43ecea744803fa46bd4a89bfdb6", "0xaac56dfe44f9894d4f536cd17acfbc44bf81a843", "0x3855407fa65c4c5104648b3a9e495072df62b585", "0x61a7cbdd597848494fa85cbb76f9c63ad9c06cad", "0xa4845491cb0dad5bd6707a33c02af0d9db435c15", "0x026e8f70a26b6e5c8bec25e23869846edfdd6728", "0x3cf3e8caea91501321feee0f0692fcd98f1c6292", "0x18822790d7baf2fa6bbca6ad8baa46985abeb81b"]

HTTP RPC

curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_getModifiedAccountsByNumber","params":[171904, 172160],"id":1}' https://public-en-baobab.klaytn.net

{"jsonrpc":"2.0","id":1,"result":["0x31b93ca83b5ad17582e886c400667c6f698b8ccd","0xb7fe15c42e66bd71835b07dc6e7daee7729f6235","0xe31a0edb11357dba71377e625fc6174da4ef4321","0x16b11cf9c2186a117b0da38315b42b1eaa03bbe5","0xd3ec3c7e4cad042dbdcb6a7e0fdbc55a92276f12","0xa4e0d726ce51572e66295756ad93206592c43a59","0xf65e07b6626ab43ecea744803fa46bd4a89bfdb6","0xaac56dfe44f9894d4f536cd17acfbc44bf81a843","0x3855407fa65c4c5104648b3a9e495072df62b585","0x61a7cbdd597848494fa85cbb76f9c63ad9c06cad","0xa4845491cb0dad5bd6707a33c02af0d9db435c15","0x026e8f70a26b6e5c8bec25e23869846edfdd6728","0x3cf3e8caea91501321feee0f0692fcd98f1c6292","0x18822790d7baf2fa6bbca6ad8baa46985abeb81b"]}

debug_preimage

Returns the preimage for a sha3 hash, if known.

Client	Method Invocation
Console	debug.preimage(hash)
RPC	{"method": "debug_preimage", "params": [hash]}

Parameters

Name	Type	Description
hash	string	sha3 hash.

Return Value

Name	Type	Description
preimage	string	Preimage for a sha3 hash.

Example

Console

> debug.preimage("0xaf953a2d01f55cfe080c0c94150a60105e8ac3d51153058a1f03dd239dd08586")
"0xdd738d9a7d987a98798123b2322d389470328420bb3d84023a8405a5523cc532235ba325235243242cb9a4758609a8604 ...  98bbd743053d0cbadaaccd4865cc0348685460ada874506ad984506ad80458ad69038fd6f908340fd9af68faf903760"

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_preimage","params":["0xaf953a2d01f55cfe080c0c94150a60105e8ac3d51153058a1f03dd239dd08586"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":"0xaf953a2d01f55cfe080c0c94150a60105e8ac3d51153058a1f03dd239dd08586")
"0xdd738d9a7d987a98798123b2322d389470328420bb3d84023a8405a5523cc532235ba325235243242cb9a4758609a8604 ...  98bbd743053d0cbadaaccd4865cc0348685460ada874506ad984506ad80458ad69038fd6f908340fd9af68faf903760"}

debug_getBadBlocks

Returns a list of the last 'bad blocks' that the client has seen on the network.

Client	Method Invocation
Console	debug.getBadBlocks()
RPC	{"method": "debug_getBadBlocks", "params": []}

Parameters

None

Return Value

Name	Type	Description
badBlock	JSON	JSON list of block-hashes

Example

Console

> debug.getBadBlocks()
[]

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_getBadBlocks","params":[],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":[]}

debug_printBlock

Retrieves a block and returns its pretty printed form.

Client	Method Invocation
Console	debug.printBlock(number)
RPC	{"method": "debug_printBlock", "params": [number]}

Parameters

Name	Type	Description
block number or hash	QUANTITY | TAG | HASH	Integer or hexadecimal block number, or the string "earliest", "latest" or "pending" as in the default block parameter, or block hash.

NOTE: In versions earlier than Klaytn v1.7.0, only integer type is available.

Return Value

Type	Description
string	Dump of a block struct.

Example

Console

> debug.printBlock(65120)
"(*types.Block)(0xc436fad3b0)(Block(#65120): Size: 2.95 kB {\nMinerHash: 7a5f8d37d34be6d9d19c5f161756d607da62227bb725ddb2f372682d7a9f1445\nHeader(e96d6477acfeba8ba865c315020471dcf751aa1bddca77f469334ab0492d218f):\n[\n\tParentHash:      e768b5b7eeb1005fe130c26da744d47e042e9227cee675fa70c89ede38653aea\n\tCoinbase:         0000000000000000000000000000000000000000\n\tRewardbase:       0000000000000000000000000000000000000000\n\tRoot: ... 0xc3be927ae5c0c48a0c83a1dbdf2df737c4a708eb6dae0ccb4a7eb042ea0a6ebf\n\tS:       0x53d8bed6357f88c8bab1f3d83942aa53c14269e58016e284656b12996a5d759a\n\tHex:      f863829d9280825208949619a83fcefc5647736cfd28845fcc4f716ff53b8080820fe7a0c3be927ae5c0c48a0c83a1dbdf2df737c4a708eb6dae0ccb4a7eb042ea0a6ebfa053d8bed6357f88c8bab1f3d83942aa53c14269e58016e284656b12996a5d759a\n]\n}\n)\n"

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_printBlock","params":[65120],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":"(*types.Block)(0xc4355b05a0)(Block(#65120): Size: 2.95 kB {\nMinerHash: 7a5f8d37d34be6d9d19c5f161756d607da62227bb725ddb2f372682d7a9f1445\nHeader(e96d6477acfeba8ba865c315020471dcf751aa1bddca77f469334ab0492d218f):\n[\n\tParentHash:       e768b5b7eeb1005fe130c26da744d47e042e9227cee675fa70c89ede38653aea\n\tCoinbase:         0000000000000000000000000000000000000000\n\tRewardbase:  ... 0000000000000000000000000000000000000000\n\tRoot:             4fd68a8f550cbd9ad665bc1a8021882ced5e1859fd9e28a48cb2910532b6ef27\n\tTxSha:            e3dbb8245038adcdc849de54af1d05f0c36c4c20d2710e31d525bd012d20a193\n\tReceiptSha:       212d4f453a897e2a486c86a4b120c1a850e89753865fe7f1aafa4"}

debug_setHead

Sets the current head of the local chain by block number.

NOTE: This is a destructive action and may severely damage your chain. Use with extreme caution.

Client	Method Invocation
Console	debug.setHead(number)
RPC	{"method": "debug_setHead", "params": [number]}

Parameters

Name	Type	Description
number	QUANTITY | TAG	Integer or hexadecimal block number, or the string "earliest", "latest" or "pending" as in the default block parameter.

Return Value

None

Example

Console

> debug.setHead("0x100")
null

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_setHead","params":["0x100"],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}

debug_seedHash

Retrieves the seed hash of a block.

Client	Method Invocation
Console	debug.seedHash(number)
RPC	{"method": "debug_seedHash", "params": [number]}

Parameters

Name	Type	Description
number	uint64	The block number.

Return Value

Name	Type	Description
seedHash	string	The block seed hash.

Example

Console

> debug.seedHash(100)
"0x0000000000000000000000000000000000000000000000000000000000000000"

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_seedHash","params":[100],"id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":"0x0000000000000000000000000000000000000000000000000000000000000000"}

debug_startWarmUp

The startWarmUp iterates the latest state trie to warm-up the trie cache. The iteration will be automatically stopped if 90% of the trie cache is full. The method returns an error if it fails in starting a warm-up, or null if it successfully has started it.

Client	Method invocation
Console	debug.startWarmUp()
RPC	{"method": "debug_startWarmUp"}

Parameters

None

Return Value

Type	Description
Error	null if a warm-up is started, or an error if not.

Example

Console

> debug.startWarmUp()
null

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_startWarmUp","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}

debug_startContractWarmUp

The startContractWarmUp iterates the latest storage trie of the given contract address to warm-up the trie cache. The iteration will be automatically stopped if 90% of the trie cache is full. The method returns an error if it fails in starting a warm-up or the given address is not a contract address, or null if it successfully has started it.

Client	Method invocation
Console	debug.startContractWarmUp(address)
RPC	{"method": "debug_startContractWarmUp", "params": [address]}

Parameters

Type	Description
20-byte DATA	Contract address

Return Value

Type	Description
Error	null if a warm-up is started, or an error if not.

Example

Console

> debug.startContractWarmUp("0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b")
null

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_startContractWarmUp", "params":["0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b"], "id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}

debug_stopWarmUp

The stopWarmUp stops the currently running warm-up. This method takes no parameters, and returns null or an error depending on a warm-up was stopped or not.

Client	Method invocation
Console	debug.stopWarmUp()
RPC	{"method": "stopWarmUp"}

Parameters

None

Return Value

Type	Description
Error	null if a warm-up is stopped, or an error if not.

Example

Console

> debug.stopWarmUp()
true

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_stopWarmUp","id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}

debug_startCollectingTrieStats

The startCollectingTrieStats iterates the latest state or storage trie to collect trie statistics. It collects storage trie statistics of the contract in the given address. If an empty address(="0x00...00") is given, it collects statistics of the whole state trie. Statistics will be logged every minute before end, containing overall and depth-by-depth information. The method returns an error if it fails in starting a task, or null if it successfully has started it.

Client	Method invocation
Console	debug.startCollectingTrieStats(address)
RPC	{"method": "debug_startCollectingTrieStats", "params": [address]}

Parameters

Type	Description
20-byte DATA	Contract address

Return Value

Type	Description
Error	null if collecting trie statistics task is started, or an error if not.

Example

Console

// empty address to collect whole state trie statistics
> debug.startCollectingTrieStats("0x0000000000000000000000000000000000000000")
null
// contract address to collect storage trie statistics
> debug.startCollectingTrieStats("0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b")
null

HTTP RPC

$ curl -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"debug_startCollectingTrieStats", "params":["0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b"], "id":1}' https://public-en-baobab.klaytn.net
{"jsonrpc":"2.0","id":1,"result":null}

Log

INFO[03/10,12:03:12 +09] [5] Started collecting trie statistics        blockNum=1491072 root=0x64af12b6374b92f6db457fa1b98fe9522d9f36ba352e3c4e01cdb75f001e8264 len(children)=16
...
INFO[03/10,12:03:12 +09] [5] Finished collecting trie statistics       elapsed=95.152412ms numNodes=133036 numLeafNodes=95948 maxDepth=9
INFO[03/10,12:03:12 +09] [5] number of leaf nodes in a depth           depth=5 numNodes=22098
INFO[03/10,12:03:12 +09] [5] number of leaf nodes in a depth           depth=6 numNodes=65309
INFO[03/10,12:03:12 +09] [5] number of leaf nodes in a depth           depth=7 numNodes=8083
INFO[03/10,12:03:12 +09] [5] number of leaf nodes in a depth           depth=8 numNodes=456
INFO[03/10,12:03:12 +09] [5] number of leaf nodes in a depth           depth=9 numNodes=2