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Update EIP-6800: Clarify BASIC_DATA layout and update naming #8753

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Jul 24, 2024
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Update EIP-6800: Clarify BASIC_DATA layout and update naming #8753

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f7de7be
update naming of code hash field
jsign Jul 23, 2024
654eb2a
layout clarifications
jsign Jul 23, 2024
1741373
feedback
jsign Jul 24, 2024
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12 changes: 6 additions & 6 deletions EIPS/eip-6800.md
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Original file line number Diff line number Diff line change
Expand Up @@ -116,7 +116,7 @@ Instead of a two-layer structure as in the Patricia tree, in the Verkle tree we
| Parameter | Value |
| --------------------- | ------- |
| BASIC_DATA_LEAF_KEY | 0 |
| CODE_KECCAK_LEAF_KEY | 1 |
| CODE_HASH_LEAF_KEY | 1 |
| HEADER_STORAGE_OFFSET | 64 |
| CODE_OFFSET | 128 |
| VERKLE_NODE_WIDTH | 256 |
Expand Down Expand Up @@ -158,11 +158,11 @@ def get_tree_key_for_basic_data(address: Address32):
return get_tree_key(address, 0, BASIC_DATA_LEAF_KEY)

# Backwards compatibility for EXTCODEHASH
def get_tree_key_for_code_keccak(address: Address32):
return get_tree_key(address, 0, CODE_KECCAK_LEAF_KEY)
def get_tree_key_for_code_hash(address: Address32):
return get_tree_key(address, 0, CODE_HASH_LEAF_KEY)
```

An account's `version`, `balance`, `nonce` and `code_size` fields are packed in the value found at `BASIC_DATA_LEAF_KEY`:
An account's `version`, `balance`, `nonce` and `code_size` fields are packed with big-endian encoding in the value found at `BASIC_DATA_LEAF_KEY`:

| Name | Offset | Size |
| ----------- | ------ | ---- |
Expand All @@ -173,9 +173,9 @@ An account's `version`, `balance`, `nonce` and `code_size` fields are packed in

Bytes `1..4` are reserved for future use.

Note: the code size is stored on 3 bytes. To allow for an extension to 4 bytes without changing the account version is possible, reserved byte #4 should be allocated last.
The current layout and encoding allow for an extension of `code_size` to 4 bytes without changing the account version.

When any account header field is set, the `version` field is also set to zero. The `code_keccak` and `code_size` fields are set upon contract or EoA creation.
When any account header field is set, the `version` field is also set to zero. The `codehash` and `code_size` fields are set upon contract or EoA creation.

#### Code

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