From a3cdfa5c4defb542c3f96b38c7a3d34d270e185e Mon Sep 17 00:00:00 2001
From: Luis Covarrubias <luiscovarrubias@bitgo.com>
Date: Fri, 13 Mar 2026 15:17:42 -0700
Subject: [PATCH] refactor: derive getBaseFactor from statics in
 AbstractLightningCoin

Replace the hardcoded 1e11 return value in getBaseFactor() with
Math.pow(10, this._staticsCoin.decimalPlaces), following the same
pattern used by Dot, Bld, Osmo, and other coins. The statics
LightningCoin already has decimalPlaces: 11 so behavior is unchanged.

BTC-3158

TICKET: BTC-3158
---
 .../abstract-lightning/src/abstractLightningCoin.ts    | 10 ++++++++--
 modules/sdk-coin-lnbtc/package.json                    |  1 +
 modules/sdk-coin-lnbtc/src/lnbtc.ts                    |  9 +++++----
 modules/sdk-coin-lnbtc/src/tlnbtc.ts                   |  9 +++++----
 4 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/modules/abstract-lightning/src/abstractLightningCoin.ts b/modules/abstract-lightning/src/abstractLightningCoin.ts
index 71bf15f3ce..6ddb9a21e9 100644
--- a/modules/abstract-lightning/src/abstractLightningCoin.ts
+++ b/modules/abstract-lightning/src/abstractLightningCoin.ts
@@ -10,19 +10,25 @@ import {
   VerifyAddressOptions,
   VerifyTransactionOptions,
 } from '@bitgo/sdk-core';
+import { BaseCoin as StaticsBaseCoin } from '@bitgo/statics';
 import * as utxolib from '@bitgo/utxo-lib';
 import { randomBytes } from 'crypto';
 import { bip32 } from '@bitgo/utxo-lib';
 
 export abstract class AbstractLightningCoin extends BaseCoin {
+  protected readonly _staticsCoin: Readonly<StaticsBaseCoin>;
   private readonly _network: utxolib.Network;
-  protected constructor(bitgo: BitGoBase, network: utxolib.Network) {
+  protected constructor(bitgo: BitGoBase, network: utxolib.Network, staticsCoin?: Readonly<StaticsBaseCoin>) {
     super(bitgo);
+    if (!staticsCoin) {
+      throw new Error('missing required constructor parameter staticsCoin');
+    }
+    this._staticsCoin = staticsCoin;
     this._network = network;
   }
 
   getBaseFactor(): number {
-    return 1e11;
+    return Math.pow(10, this._staticsCoin.decimalPlaces);
   }
 
   verifyTransaction(params: VerifyTransactionOptions): Promise<boolean> {
diff --git a/modules/sdk-coin-lnbtc/package.json b/modules/sdk-coin-lnbtc/package.json
index 4788a6548a..cfe4ea0290 100644
--- a/modules/sdk-coin-lnbtc/package.json
+++ b/modules/sdk-coin-lnbtc/package.json
@@ -42,6 +42,7 @@
   "dependencies": {
     "@bitgo/abstract-lightning": "^7.8.3",
     "@bitgo/sdk-core": "^36.34.0",
+    "@bitgo/statics": "^58.30.0",
     "@bitgo/utxo-lib": "^11.21.0"
   },
   "devDependencies": {
diff --git a/modules/sdk-coin-lnbtc/src/lnbtc.ts b/modules/sdk-coin-lnbtc/src/lnbtc.ts
index b47916c524..eeda08cb92 100644
--- a/modules/sdk-coin-lnbtc/src/lnbtc.ts
+++ b/modules/sdk-coin-lnbtc/src/lnbtc.ts
@@ -1,14 +1,15 @@
 import { AbstractLightningCoin } from '@bitgo/abstract-lightning';
 import { BitGoBase, BaseCoin } from '@bitgo/sdk-core';
+import { BaseCoin as StaticsBaseCoin } from '@bitgo/statics';
 import * as utxolib from '@bitgo/utxo-lib';
 
 export class Lnbtc extends AbstractLightningCoin {
-  constructor(bitgo: BitGoBase, network?: utxolib.Network) {
-    super(bitgo, network || utxolib.networks.bitcoin);
+  constructor(bitgo: BitGoBase, network?: utxolib.Network, staticsCoin?: Readonly<StaticsBaseCoin>) {
+    super(bitgo, network || utxolib.networks.bitcoin, staticsCoin);
   }
 
-  static createInstance(bitgo: BitGoBase): BaseCoin {
-    return new Lnbtc(bitgo);
+  static createInstance(bitgo: BitGoBase, staticsCoin?: Readonly<StaticsBaseCoin>): BaseCoin {
+    return new Lnbtc(bitgo, undefined, staticsCoin);
   }
 
   getChain(): string {
diff --git a/modules/sdk-coin-lnbtc/src/tlnbtc.ts b/modules/sdk-coin-lnbtc/src/tlnbtc.ts
index e98b333951..22ee1fdbb1 100644
--- a/modules/sdk-coin-lnbtc/src/tlnbtc.ts
+++ b/modules/sdk-coin-lnbtc/src/tlnbtc.ts
@@ -2,16 +2,17 @@
  * @prettier
  */
 import { BaseCoin, BitGoBase } from '@bitgo/sdk-core';
+import { BaseCoin as StaticsBaseCoin } from '@bitgo/statics';
 import { Lnbtc } from './lnbtc';
 import * as utxolib from '@bitgo/utxo-lib';
 
 export class Tlnbtc extends Lnbtc {
-  constructor(bitgo: BitGoBase) {
-    super(bitgo, utxolib.networks.testnet);
+  constructor(bitgo: BitGoBase, staticsCoin?: Readonly<StaticsBaseCoin>) {
+    super(bitgo, utxolib.networks.testnet, staticsCoin);
   }
 
-  static createInstance(bitgo: BitGoBase): BaseCoin {
-    return new Tlnbtc(bitgo);
+  static createInstance(bitgo: BitGoBase, staticsCoin?: Readonly<StaticsBaseCoin>): BaseCoin {
+    return new Tlnbtc(bitgo, staticsCoin);
   }
 
   getChain(): string {