From 265fec4639de4d5d371238f0c0e818a72cd259c6 Mon Sep 17 00:00:00 2001
From: mononaut <mononaut@mempool.space>
Date: Thu, 25 Jun 2026 11:54:34 +0000
Subject: [PATCH] parse dmnd stratum v2 tags

---
 backend/src/api/blocks.ts                    |  4 +++-
 backend/src/repositories/BlocksRepository.ts |  4 +++-
 backend/src/utils/bitcoin-script.ts          | 25 +++++++++++++++++++-
 3 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/backend/src/api/blocks.ts b/backend/src/api/blocks.ts
index 0d3631928..be247f571 100644
--- a/backend/src/api/blocks.ts
+++ b/backend/src/api/blocks.ts
@@ -37,7 +37,7 @@ import { calculateGoodBlockCpfp } from './cpfp';
 import blockProcessor, { BlockProcessingResult, detectTemplateAlgorithm, saveCpfpDataToCpfpSummary } from './block-processor';
 import mempool from './mempool';
 import CpfpRepository from '../repositories/CpfpRepository';
-import { parseDATUMTemplateCreator } from '../utils/bitcoin-script';
+import { parseDATUMTemplateCreator, parseDMNDTemplateCreator } from '../utils/bitcoin-script';
 import database from '../database';
 import { getBlockFirstSeenFromLogs, getOldestLogTimestampFromLogs, scanLogsForBlocksFirstSeen } from '../utils/file-read';
 
@@ -359,6 +359,8 @@ class Blocks {
 
         if (extras.pool.name === 'OCEAN') {
           extras.pool.minerNames = parseDATUMTemplateCreator(extras.coinbaseRaw);
+        } else if (extras.pool.name === 'DMND') {
+          extras.pool.minerNames = parseDMNDTemplateCreator(extras.coinbaseRaw);
         }
       }
 
diff --git a/backend/src/repositories/BlocksRepository.ts b/backend/src/repositories/BlocksRepository.ts
index bb0e4f6c5..faa8fce74 100644
--- a/backend/src/repositories/BlocksRepository.ts
+++ b/backend/src/repositories/BlocksRepository.ts
@@ -14,7 +14,7 @@ import chainTips from '../api/chain-tips';
 import blocks from '../api/blocks';
 import BlocksAuditsRepository from './BlocksAuditsRepository';
 import transactionUtils from '../api/transaction-utils';
-import { parseDATUMTemplateCreator } from '../utils/bitcoin-script';
+import { parseDATUMTemplateCreator, parseDMNDTemplateCreator } from '../utils/bitcoin-script';
 import poolsUpdater from '../tasks/pools-updater';
 
 interface DatabaseBlock {
@@ -1374,6 +1374,8 @@ class BlocksRepository {
 
     if (extras.pool.name === 'OCEAN') {
       extras.pool.minerNames = parseDATUMTemplateCreator(extras.coinbaseRaw);
+    } else if (extras.pool.name === 'DMND') {
+      extras.pool.minerNames = parseDMNDTemplateCreator(extras.coinbaseRaw);
     }
 
     blk.extras = <BlockExtension>extras;
diff --git a/backend/src/utils/bitcoin-script.ts b/backend/src/utils/bitcoin-script.ts
index 117fa61a7..2a88477b8 100644
--- a/backend/src/utils/bitcoin-script.ts
+++ b/backend/src/utils/bitcoin-script.ts
@@ -224,4 +224,27 @@ export function parseDATUMTemplateCreator(coinbaseRaw: string): string[] | null
   tagString = tagString.replace('\x00', '');
 
   return tagString.split('\x0f').map((name) => name.replace(/[^a-zA-Z0-9 ]/g, ''));
-}
\ No newline at end of file
+}
+
+/** Extracts miner names from a DMND coinbase transaction */
+export function parseDMNDTemplateCreator(coinbaseRaw: string): string[] {
+  try {
+    if (!coinbaseRaw || coinbaseRaw.length % 2 !== 0 || !/^[0-9a-fA-F]+$/.test(coinbaseRaw)) {
+      return [];
+    }
+
+    const bytes = Buffer.from(coinbaseRaw, 'hex');
+    const blockHeightLength = bytes[0];
+    const tagDelimiterIndex = 1 + blockHeightLength;
+    if (bytes.length <= tagDelimiterIndex || bytes[tagDelimiterIndex] !== 0x00) {
+      return [];
+    }
+
+    const tagStart = tagDelimiterIndex + 1;
+    const tagEnd = bytes.indexOf(0x00, tagStart);
+    const tags = bytes.subarray(tagStart, tagEnd === -1 ? undefined : tagEnd);
+    return tags.toString('utf8').split('/').slice(1, -1);
+  } catch {
+    return [];
+  }
+}