reworked health audit

backend/src/api/audit.ts

@@ -1,3 +1,4 @@
+import { couldStartTrivia } from 'typescript';
 import config from '../config';
 import logger from '../logger';
 import { MempoolTransactionExtended, MempoolBlockWithTransactions } from '../mempool.interfaces';
@@ -28,6 +29,9 @@ class Audit {
     let matchedWeight = 0;
     let projectedWeight = 0;
 
+    let spamWeight = 0;
+    let blkWeight = 0;
+
     const inBlock = {};
     const inTemplate = {};
 
@@ -72,6 +76,19 @@ class Audit {
       matchedWeight += transactions[0].weight;
     }
 
+
+    for (const tx of transactions){
+      blkWeight += tx.weight;
+    }
+
+    for (const tx of transactions){
+      if(tx.spam !== undefined){
+        if (tx.spam == true){
+          spamWeight += tx.weight;
+        }
+      }
+    }
+
     // we can expect an honest miner to include 'displaced' transactions in place of recent arrivals and censored txs
     // these displaced transactions should occupy the first N weight units of the next projected block
     let displacedWeightRemaining = displacedWeight + 4000;
@@ -169,11 +186,8 @@ class Audit {
     const numCensored = Object.keys(isCensored).length;
     const numMatches = matches.length - 1; // adjust for coinbase tx
     let score = 0;
-    if (numMatches <= 0 && numCensored <= 0) {
-      score = 1;
-    } else if (numMatches > 0) {
-      score = (numMatches / (numMatches + numCensored));
-    }
+
+    score = (Math.abs((spamWeight/blkWeight)-1));
     const similarity = projectedWeight ? matchedWeight / projectedWeight : 1;
 
     return {

backend/src/api/common.ts

@@ -462,6 +462,20 @@ export class Common {
     return flags;
   }
 
+  static isInscription2(vin, tx): void {
+    // in taproot, if the last witness item begins with 0x50, it's an annex
+    const hasAnnex = vin.witness?.[vin.witness.length - 1].startsWith('50');
+    // script spends have more than one witness item, not counting the annex (if present)
+    if (vin.witness.length > (hasAnnex ? 2 : 1)) {
+      // the script itself is the second-to-last witness item, not counting the annex
+      const asm = vin.inner_witnessscript_asm || transactionUtils.convertScriptSigAsm(vin.witness[vin.witness.length - (hasAnnex ? 3 : 2)]);
+      // inscriptions smuggle data within an 'OP_0 OP_IF ... OP_ENDIF' envelope
+      if (asm?.includes('OP_0 OP_IF')) {
+        tx.spam = true;
+      }
+    }
+  }
+
   static getTransactionFlags(tx: TransactionExtended, height?: number): number {
     let flags = tx.flags ? BigInt(tx.flags) : 0n;
 
@@ -513,6 +527,7 @@ export class Common {
             flags |= TransactionFlags.p2tr;
             if (vin.witness?.length) {
               flags = Common.isInscription(vin, flags);
+              Common.isInscription2(vin, tx);
             }
           } break;
         }
@@ -521,6 +536,7 @@ export class Common {
         if (vin.witness?.length >= 2) {
           try {
             flags = Common.isInscription(vin, flags);
+            Common.isInscription2(vin, tx);
           } catch {
             // witness script parsing will fail if this isn't really a taproot output
           }
@@ -571,7 +587,7 @@ export class Common {
         case 'v0_p2wpkh': flags |= TransactionFlags.p2wpkh; break;
         case 'v0_p2wsh': flags |= TransactionFlags.p2wsh; break;
         case 'v1_p2tr': flags |= TransactionFlags.p2tr; break;
-        case 'op_return': flags |= TransactionFlags.op_return; break;
+        case 'op_return': flags |= TransactionFlags.op_return; tx.spam = true; break;
       }
       if (vout.scriptpubkey_address) {
         reusedOutputAddresses[vout.scriptpubkey_address] = (reusedOutputAddresses[vout.scriptpubkey_address] || 0) + 1;
@@ -594,6 +610,7 @@ export class Common {
     }
     if (hasFakePubkey) {
       flags |= TransactionFlags.fake_pubkey;
+      tx.spam = true;
     }
 
     // fast but bad heuristic to detect possible coinjoins

backend/src/mempool.interfaces.ts

@@ -132,6 +132,7 @@ export interface TransactionExtended extends IEsploraApi.Transaction {
   replacement?: boolean;
   uid?: number;
   flags?: number;
+  spam?: boolean;
 }
 
 export interface MempoolTransactionExtended extends TransactionExtended {

frontend/src/app/components/block/block.component.html

@@ -59,7 +59,7 @@
                 <td [innerHTML]="'&lrm;' + (block.weight | wuBytes: 2)"></td>
               </tr>
               <tr *ngIf="auditAvailable">
-                <td><ng-container i18n="latest-blocks.health">Health</ng-container><a class="info-link" [routerLink]="['/docs/faq' | relativeUrl ]" fragment="what-is-block-health"><fa-icon [icon]="['fas', 'info-circle']" [fixedWidth]="true"></fa-icon></a></td>
+                <td><ng-container i18n="latest-blocks.health">Health</ng-container></td>
                 <td>
                   <span
                     class="health-badge badge"