From ec6a754f0c8647dae59c73b2589225cb200d83dd Mon Sep 17 00:00:00 2001
From: Richard Moore <me@ricmoo.com>
Date: Fri, 12 Apr 2024 00:08:01 -0400
Subject: [PATCH] Added prevRandao to block (#3372).

---
 src.ts/providers/format.ts     |  3 +++
 src.ts/providers/formatting.ts |  6 ++++++
 src.ts/providers/provider.ts   | 11 +++++++++--
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/src.ts/providers/format.ts b/src.ts/providers/format.ts
index 36ef9828c5..c401f66e00 100644
--- a/src.ts/providers/format.ts
+++ b/src.ts/providers/format.ts
@@ -129,9 +129,12 @@ const _formatBlock = object({
     excessBlobGas: allowNull(getBigInt, null),
 
     miner: allowNull(getAddress),
+    prevRandao: allowNull(formatHash, null),
     extraData: formatData,
 
     baseFeePerGas: allowNull(getBigInt)
+}, {
+    prevRandao: [ "mixHash" ]
 });
 
 export function formatBlock(value: any): BlockParams {
diff --git a/src.ts/providers/formatting.ts b/src.ts/providers/formatting.ts
index d345ff9444..ecae5937af 100644
--- a/src.ts/providers/formatting.ts
+++ b/src.ts/providers/formatting.ts
@@ -83,6 +83,12 @@ export interface BlockParams {
      */
     miner: string;
 
+    /**
+     *  The latest RANDAO mix of the post beacon state of
+     *  the previous block.
+     */
+    prevRandao?: null | string;
+
     /**
      *  Additional data the miner choose to include.
      */
diff --git a/src.ts/providers/provider.ts b/src.ts/providers/provider.ts
index 8256505e23..10efd906f3 100644
--- a/src.ts/providers/provider.ts
+++ b/src.ts/providers/provider.ts
@@ -542,6 +542,12 @@ export class Block implements BlockParams, Iterable<string> {
      */
     readonly miner!: string;
 
+    /**
+     *  The latest RANDAO mix of the post beacon state of
+     *  the previous block.
+     */
+    readonly prevRandao!: null | string;
+
     /**
      *  Any extra data the validator wished to include.
      */
@@ -592,6 +598,7 @@ export class Block implements BlockParams, Iterable<string> {
             blobGasUsed: block.blobGasUsed,
             excessBlobGas: block.excessBlobGas,
             miner: block.miner,
+            prevRandao: getValue(block.prevRandao),
             extraData: block.extraData,
 
             baseFeePerGas: getValue(block.baseFeePerGas),
@@ -640,7 +647,7 @@ export class Block implements BlockParams, Iterable<string> {
     toJSON(): any {
         const {
             baseFeePerGas, difficulty, extraData, gasLimit, gasUsed, hash,
-            miner, nonce, number, parentHash, parentBeaconBlockRoot,
+            miner, prevRandao, nonce, number, parentHash, parentBeaconBlockRoot,
             stateRoot, receiptsRoot, timestamp, transactions
         } = this;
 
@@ -653,7 +660,7 @@ export class Block implements BlockParams, Iterable<string> {
             gasUsed: toJson(gasUsed),
             blobGasUsed: toJson(this.blobGasUsed),
             excessBlobGas: toJson(this.excessBlobGas),
-            hash, miner, nonce, number, parentHash, timestamp,
+            hash, miner, prevRandao, nonce, number, parentHash, timestamp,
             parentBeaconBlockRoot, stateRoot, receiptsRoot,
             transactions,
         };