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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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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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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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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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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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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Difference between Recursive Linear Prefix or Recursive Length Prefix? Vs Google Protocol Buffer (Protobuf)

Like to know what is the difference between Recursive Linear Prefix and Recursive Length Prefix? I have seen both around Are there they same? Or different? Also would like to know the reason why RLP ...
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132 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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Why RLP choose 55 bytes length for split item/list encoding?

I know we choose [0x00, 0x7f] for ASCII, and split the remain [0x80, 0xff] to [0x80, 0xbf] for item, [0xc0, 0xff] for list, but how do we choose 55 bytes length further for split the item or list?
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98 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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176 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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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
155 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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Broadcast error rlp: non-canonical integer (leading zero bytes) for uint64

Here's a transaction to broadcast: ...
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1answer
172 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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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
258 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
117 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
187 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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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
166 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
290 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
371 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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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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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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What is the shared nibble of this extension node?

I have an extension node here: Key: 000b17906abb9f83c5e190bc3d0bed212e66bf44d99997c53c2071e1413194b6 Value: [ 3866a6d45a815576000da23c1a017179233e9d6437806aef7c2264588739d0, ...
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204 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, ...
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1answer
733 views

Block header format

Does anyone understand what each element of a block header represents? I have an example block header represented here: [ cd7bd64fba4cc782fe5474d3640882afece5887180591e72f80ce6916cf73526, ...
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162 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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430 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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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
119 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
2k 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
784 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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111 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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1answer
98 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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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
351 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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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 ...