Differences between Ethereum and Linea
EVM opcodes​
All EVM opcodes are managed identically to Ethereum unless presented in the following table.
| Opcode name | Ethereum | Linea |
|---|---|---|
DIFFICULTY / PREVRANDAO | Returns the RANDAO value from the previous block | Returns a fixed number |
In Ethereum, this opcode was previously known as DIFFICULTY. However, through the implementation of EIP-4399, it was renamed to PREVRANDAO, and its functionality changed due to the switch from PoW to PoS. Notably, it is a full 256-bit value that represents the randomness beacon output of the previous block. For more, see the 'Security Considerations' section of the above EIP.
Consult the Ethereum Foundation's Opcode Reference for more.