Merge pull request #412 from rsksmart/basefee-opcode

RSKIP-412 for basefee opcode

IPs/RSKIP412.md

@@ -0,0 +1,42 @@
+---
+rskip: 412
+title: BASEFEE instruction
+description:
+status: Draft
+purpose: Usa
+author: VK
+layer: Core
+complexity: 2
+created: 2023/11/9
+---
+# BASEFEE instruction
+
+
+|RSKIP          | 412                 |
+| :------------ |:--------------------|
+|**Title**      | BASEFEE instruction |
+|**Created**    | NOV-2023            |
+|**Author**     | VK                  |
+|**Purpose**    | Usa                 |
+|**Layer**      | Core                |
+|**Complexity** | 2                   |
+|**Status**     | Draft               |
+
+
+# **Abstract**
+
+This RSKIP implements [Ethereum BASEFEE instruction](https://eips.ethereum.org/EIPS/eip-3198). The `BASEFEE (0x48)` opcode returns the base fee value of the current block it is executing in.
+
+# **Motivation**
+
+In order to maintain compatibility with the EVM, Rootstock needs to implement the `BASEFEE` opcode.
+
+There's an important difference when comparing *Rootstock* vs *ETH* `BASEFEE` opcode: as Rootstock doesn't define a base fee for its blocks, the block `minimum gas price` is returned instead. More details on the specification section.
+
+# **Specification**
+
+The `BASEFEE` opcode pushes onto the stack the minimum gas price of the block in which the transaction is being executed. The cost of the `BASEFEE` opcode is 2. 
+
+# **Copyright**
+
+Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/)

README.md

@@ -221,6 +221,7 @@ You can find an easily browseable version of this information [here](https://ips
 | 388 |[Network Upgrade: Fingerroot](IPs/RSKIP388.md)| 31-MAY-23 | AE | Usa,Sec | Core | 2 | Adopted |
 | 398 |[PUSH0 instruction](IPs/RSKIP398.md)| 11-JUL-23 | VK | Sca | Core | 2 | Draft |
 | 400 |[Calldata gas cost reduction](IPs/RSKIP400.md)| 12-JUL-23 | VK | Sca | Core | 2 | Draft |
+| 412 |[BASEFEE instruction](IPs/RSKIP412.md)| 9-NOV-23 | VK | Usa | Core | 2 | Draft |
 
 (*) Under evaluation to be implemented in the next reference client release