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Understanding Hex and ASM fields in Ethereum transactions
When using the “Bitcoin-Cli Decoderawtransction” command to decode a gross transaction from a hexadecimal string, you are probably curious about the content of each field. In this article, we will deepen in the world of Ethereum transactions and explore what the fields of Hex and ASM represent.
hexagonal fields: Basic elements
In Bitcoin, when a transaction is broadcast or extracted, it is represented in a compact format using 64-bit numbers (32 bytes). Each field in the transaction represents specific information. Such a field is the Hex field, which contains the data coded with gross hex for the transaction.
The Hex field usually consists of a sequence of 4-bit hexadecimal values, separated by commas or spaces. For example:
`Json
{
"0x ...": {
"0x01": ...,
"0x02": ...
}
}
ASM fields: Secret language
TheASMfield is a crucial component of Ethereum transactions that allows you to specify the personalized assembly code. It is essentially a string that contains the instructions of the assembly language that will be executed on the Ethereum blockchain.
When the decoding of a gross transaction, theASMfield is usually represented as a hexadecimal value in the square brackets [], prefixed with a colon: followed by several hexadecimal values separated by commas.
`Json
{
"0x ...": {
"[...]: [...]",
... ...
}
}
This notation allows you to define the personalized assembly code that will be executed on the Ethereum blockchain.
HEX fields: Decoding values
When decoding a gross transaction usingBitcoin-Cli DecoderawTransction, you can pass into a hexadecimal string as an argument, as follows:
Bash
Bitcoin-Cli DecoderawTransction 0x1234567890ABCDEF
The exit will be a JSON object that contains the decoded fields, including Hex and ASM values.
In our example, the "Decodewtransction" command produces a JSON object with the following structure:
Json
{
"hex": "0x1234567890ABCDEF",
"Asm": "[...]: [...]"
}
The value ofHexis simply the gross hexadecimal string transmitted as an argument.
ASM fields: Decoding values
To decode theASMfield, you will need to move into a JSON object with a key value in which the first key is" 0x ... " (just like the hexagonal field), and the second value is a value Another JSON object containing the assembly code:
`Json
{
"0x ...": {
"[...]: [...]"
}
}
For example, if your JSON output looks like this:
Json
{
"hex": "0x1234567890ABCDEF",
"Asm": "{...}: {...}"
}
You can decode theASMfield by passing into a JSON object with a key value in which the first key is" 0x "and the second value is another JSON object containing the assembly code:
Bash
Bitcoin-Cli Decoderawtransction 0x1234567890ABCDEF "{[...]: [...]}"
The exit will be a JSON object that represents the personalized assembly code executed on the Ethereum blockchain.
In summary, the hex fields represent gross hexadecimal data in a compact format, while the ASM fields are a special type of field that contains personalized assembly instructions. When decoding a gross transaction usingBitcoin-Cli DecoderawTransction, you can pass either in a Hex Hex or in an ASM string to specify what values to include in the output JSON.
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