Questions tagged [rlp]
The purpose of RLP (Recursive Length Prefix) is to encode arbitrarily nested arrays of binary data, and RLP is the main encoding method used to serialize objects in Ethereum.
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Can cheaper transactions be created by brute forcing RLP-encoded V,R,S values with leading zeros
When I make a raw txn using RLP-encoding I note that the VRS values are not deterministic. Sometimes the R and S values can have leading zeros, these get omitted, thus making the transaction data ...
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Re-create raw transaction hash from transaction object
Is there a way to re-create the signed transaction hash from tx object. I found the How to construct a raw Ethereum transaction from transaction data answer helpful, but when I try to re-create the ...
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1answer
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What is wrong with this hand-made raw transaction?
Here are two RLP-encodings of two signings of the same transaction --- for Goerli. Notice how the "Signed by" address is different. This must be implying something is wrong with my signing ...
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Building TransactionRoot from a single transaction
I'm trying to follow through the trie construction for transaction data - and the multiple resources online seem quite conflicting!
Let's consider transaction
https://etherscan.io/tx/...
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1answer
107 views
Why does this call to DSProxy fail?
Take these two contracts, both deployed on Kovan and with the source code verified:
DSProxy: 0xa92Bed719071A4d33B0B348513E7e866a6ff6B3F
TargetContract: 0xE3CD2e7a628b57d3e50c5f7B921182f676721bDF
And ...
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1answer
43 views
How to parse the node information in the nodes directory by leveldb?
I want to get all the node IP addresses of ETH, so I need to parse the geth/nodes directory, but I can't find the specific data format and cannot parse it.
I found a same problem, but there is no ...
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101 views
Invalid block header RLP and rlp: input string too short for common.Hash, decoding into (types.Header).Root
when I run the geth as a private chain node it shows error below:
C:\tools\src\github.com\ethereum\go-ethereum\geth.exe init C:\tools\src\github.com\ethereum\go-ethereum\genesis.json #gosetup
INFO [09-...
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1answer
62 views
Is Ethereum block header a list?
Decoding a RLP encoded block using Eth specifications do we get header as list? But as per format i.e., [[blockHeader,transactionList,uncleList],totalDifficulty], blockHeader should have been string.
...
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Calculated blockhash of PoA block mismatches with actual blockhash returned by RPC
I set up a Demo PoA chain using Parity Etheruem. I sent some transactions to it and it started producing blocks. A block on my demo PoA chain was generated with block hash ...
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2answers
621 views
Understanding serialized unsigned raw transaction
I'm currently learning about RLP (ethereum-under-the-hood-part-ii, wiki-eth-rlp) and Ethereum transaction structure, my goal is to create an unsigned raw tx and then sign it.
Right now I'm playing ...
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1answer
379 views
RLP decoding for a list
in many standard documentation and many blogs, I have found the example for list with two strings like below
[“cat”, “dog” ] -> C8 83 636174 83 646F67
and thats how it is decoded
1) Retrieve the ...
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297 views
sendRawTransaction insufficient funds while there is enough balance
Sorry I probably create a topic that was answered multiple times but unfortunately I couldn't find a solution. I'm trying to use RPC server of Geth to send a raw transaction. I've an address with a ...
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460 views
Web3: Sending a signed serialized transaction throws an error: rlp: expected input list for types.txdata. Please help
I am feeding a signed serialized raw transaction to sendRawTransaction of web3. The problem is that whenever I call sendRawTransaction it throws an error:
rlp: expected input list for types.txdata.
...
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0answers
81 views
is there a library to convert transaction receipt to rlp?
I found ethereumjs-tx for transaction to rlp, but i didnt find any libraries to convert transaction reciept to rlp. or is there a way to get rlp format transaction receipt from a service like infura ...
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1answer
532 views
block hash from block-header rlp [duplicate]
Given the RLP of a block header, how do i get the block hash?
https://github.com/ethereum/go-ethereum/blob/master/core/types/block.go#L99
The above link says: Hash returns the block hash of the ...
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1answer
272 views
what type of encoding is used by the abi specification in solidity
the abi specification of solidity which provides functions like abi.encodePacked() using a certain type of encoding (eg: for functions, a 4 byte function signature hash followed by encoding of ...
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1answer
326 views
geth inter-node communication (devp2p/rlpx) encryption
I am currently analysing the encryption mechanisms used in geth.
Currently I have gathered the following information from the source code (https://github.com/ethereum/go-ethereum/blob/master/p2p/rlpx....
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1answer
301 views
Recovered Sender Address from Raw Transaction
I'm trying this code example : https://thomasclowes.com/verifying-an-ethereum-signature-on-the-server-php-2/
Expected $recoveredSenderAddress = 0xd5bfc359c3a377bb8afd41db8ffc8d1349718233
Actual $...
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1answer
218 views
Rlp vs rlpx: the specified difference between rlp and rlpx?
Rlp vs rlpx - the specified difference between rlp and rlpx?
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2answers
528 views
Broadcast error rlp: non-canonical integer (leading zero bytes) for uint64
Here's a transaction to broadcast:
...
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1answer
263 views
How does Ethereum differentiate between 0x0 and null during contract creation?
According to the EVM documentation, all values are initialized. This means to will contain the 0 address, as null is not a recognized state. The 0 address links to an external account (which we all ...
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Hex Prefix Ethereum - Yellow Paper
I am trying to understand what is Hex Prefix as specified in the Yellow Paper(Appendix C), I don't see a similar reference in the whitepaper, but thank's to this awesome medium post I think I got it, ...
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0answers
168 views
What does “RlpInvalidIndirection” error mean?
I run my own Parity node for Ropsten network.
I am sending raw transactions to the node with "eth_sendRawTransaction" api, and sometimes it returns {-32602, "Invalid RLP.", "RlpInvalidIndirection"} ...
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1answer
344 views
Correct way to deterministically compute contract address in Python
To begin with, I have already gone through the approach outlined in the following thread: How is the address of an Ethereum contract computed?
I wanted to test if the approach actually works. On my ...
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1answer
155 views
Why a length-1024 string of RLP encoding is \xb9\x04\x00?
In the Ethereum wiki RLP page,
If a string is more than 55 bytes long, the RLP encoding consists of a single byte with value 0xb7 plus the length in bytes of the length of the string in binary form,...
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1answer
262 views
How to sign a simple transfer TX with digitalbitbox python api
I'm trying to sign a simple transfer transaction using digitalbitbox's python api (see here and code snippet below).
I send the following json to the HW wallet api:
Sending: {"sign":{"data":[{"...
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2answers
1k views
How to RLP-encode messages in Solidity
I'm trying to figure out how to interact with the current version of the Casper contract from Solidity. The vote-function in the casper contract takes an array of bytes, which represents the RLP-...
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1answer
196 views
RLP Rationale Question
I am trying to understand why RLP was chosen and developed as an in-house protocol.I stumbled up this link which provides some insights:
https://github.com/ethereum/wiki/wiki/Design-Rationale
Trying ...
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1answer
374 views
How long can a string be until it spills into the next word?
string is dynamic length storage.
I imagine a string of length (bytes length) 1, 2 or 3 is all the same length on storage, probably one word.
Which byte causes it to spill over into a second, third ...
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1answer
663 views
RLP decoding question
I am trying to understand what this means from the RLP white paper wiki "The only purpose of RLP is to encode structure; encoding specific data types (eg. strings, floats) is left up to higher-order ...
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1answer
520 views
Ethereum network messaging
I am trying to "join the dots" around the networking aspect of Ethereum. From the documents, it seems, the underlying protocol is RLPx that powers the ÐΞVp2p Wire Protocol.
Though TCP provides a ...
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2answers
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RLP ethereum decoding
Hi!
I have some data, like this ( 827ab7 ), encoding RLP.
How I can to know, what is it (string, list or int)?
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1answer
267 views
What is the shared nibble of this extension node?
I have an extension node here:
Key:
000b17906abb9f83c5e190bc3d0bed212e66bf44d99997c53c2071e1413194b6
Value:
[
3866a6d45a815576000da23c1a017179233e9d6437806aef7c2264588739d0,
...
2
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1answer
224 views
How Merkle Tree obtain root node hash (example from 'Understanding the ethereum trie')?
I read Understanding the ethereum trie and try to do examples from that article. Now i am at ex1.py - first exaple. Look at code from that example:
import sys
sys.path.append('src')
import trie, ...
3
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1answer
1k views
Block header format
Does anyone understand what each element of a block header represents? I have an example block header represented here:
[
cd7bd64fba4cc782fe5474d3640882afece5887180591e72f80ce6916cf73526,
...
2
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1answer
202 views
Confusion over RLP encoding for byte array > 55 bytes
I am reading through the wiki on RLP (https://github.com/ethereum/wiki/wiki/RLP) and think I am missing something fundamental.
For byte arrays (not lists) greater than 55 bytes, the RLP encoding is ...
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1answer
643 views
Does RLP specify integer encoding?
The RLP specification says the following about integers:
The only purpose of RLP is to encode structure; encoding specific atomic data types (eg. strings, ints, floats) is left up to higher-order ...
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2answers
4k views
LevelDB in Geth, key and values
When parsing through the levelDB or RocksDB (Depending on the client you are using) there are string values representing the key and the value. These are both stored as Byte arrays as well.
My ...
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1answer
167 views
binary encoding of nonce 0
Although probably not an issue in practice, I'm confused how nonce of zero is encoded in transactions.
According to RLP doc, \x00 should be encoded as \x00. But the source code of pyethereum shows ...
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1answer
3k views
Why was RLP chosen as the low level protocol encoding algorithm?
Is this an ad-hoc decision? Why RLP? Is it specifically suited to something?
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1answer
1k views
Invalid transaction v,r,s values with geth when reading from of signed MEW RLP transaction
I generated a signed transaction with myEtherWallet:
...
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1answer
191 views
Can I add leading zeroes at will when building an RLP-encoded transaction?
Suppose I'm building a transaction such as:
const raw = [
new Buffer("0001", "hex"),
new Buffer("23000000000", "hex"),
new Buffer("21000", "hex"),
new Buffer("0x00000000000000000000"),...
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votes
1answer
112 views
What does string mean in patricia tree wiki
What does string mean in patricia tree wiki specifically here
Merkle Patricia trees provide a cryptographically authenticated data structure that can be used to store all (key, value) bindings, ...
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0answers
195 views
Simple hello packet
I am trying to generate a simple hello packet for handshaking with a remote Ethereum client using the encode method from the rlp library.
from rlp import encode
hello = bytearray(encode([0x00, 4, "...
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2answers
534 views
RLP encoding of 0
According to the docs here,
For a single byte whose value is in the [0x00, 0x7f] range, that byte
is its own RLP encoding
I ran the following using pyrlp (similar to the code in pyethereum here):...
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2answers
3k views
Clarification of “256 bit word” semantics
EVM has "256bit words". Some cases treat strings shorter than 32 bytes (256 bits) as left-justified ascii (packed into the most significant bytes of the word).
Does this mean that the word value of ...
