feat(sdk-coin-kas): add Kaspa (KAS) unique chain SDK integration [CECHO-388]

Implements a full BitGoJS SDK module for Kaspa (KAS), a UTXO-based
BlockDAG chain using Schnorr signatures over secp256k1 and BLAKE2B
sighash with the "TransactionSigningHash" domain tag.

Changes:
- modules/sdk-coin-kas/: new SDK module with KeyPair, Transaction,
  TransactionBuilder, TransactionBuilderFactory, Kas/TKas coin classes,
  constants, interfaces, and utilities
- Kaspa cashaddr encoding (`:` separator, custom polymod checksum)
- statics: KasCoin class, CoinFamily.KAS, BaseUnit.KAS, KaspaMainnet/
  KaspaTestnet networks, kas/tkas coin entries with UUIDs
- sdk-core/environments.ts: kasNodeUrl field
- bitgo/coinFactory.ts + coins/index.ts: kas/tkas registered
- account-lib: kas/tkas added to coinBuilderMap
- tsconfig references updated (account-lib, bitgo, tsconfig.packages.json)
- CODEOWNERS, Dockerfile updated

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: 2 people

CODEOWNERS

@@ -75,6 +75,7 @@
 /modules/sdk-coin-hbar/ @BitGo/ethalt-team
 /modules/sdk-coin-icp/ @BitGo/ethalt-team
 /modules/sdk-coin-initia/ @BitGo/ethalt-team
+/modules/sdk-coin-kas/ @BitGo/ethalt-team
 /modules/sdk-coin-iota/ @BitGo/ethalt-team
 /modules/sdk-coin-mon/ @BitGo/ethalt-team
 /modules/sdk-coin-mantra/ @BitGo/ethalt-team

Dockerfile

@@ -95,6 +95,7 @@ COPY --from=builder /tmp/bitgo/modules/sdk-coin-icp /var/modules/sdk-coin-icp/
 COPY --from=builder /tmp/bitgo/modules/sdk-coin-initia /var/modules/sdk-coin-initia/
 COPY --from=builder /tmp/bitgo/modules/sdk-coin-injective /var/modules/sdk-coin-injective/
 COPY --from=builder /tmp/bitgo/modules/sdk-coin-islm /var/modules/sdk-coin-islm/
+COPY --from=builder /tmp/bitgo/modules/sdk-coin-kas /var/modules/sdk-coin-kas/
 COPY --from=builder /tmp/bitgo/modules/sdk-coin-mon /var/modules/sdk-coin-mon/
 COPY --from=builder /tmp/bitgo/modules/sdk-coin-near /var/modules/sdk-coin-near/
 COPY --from=builder /tmp/bitgo/modules/sdk-coin-oas /var/modules/sdk-coin-oas/
@@ -195,6 +196,7 @@ cd /var/modules/sdk-coin-icp && yarn link && \
 cd /var/modules/sdk-coin-initia && yarn link && \
 cd /var/modules/sdk-coin-injective && yarn link && \
 cd /var/modules/sdk-coin-islm && yarn link && \
+cd /var/modules/sdk-coin-kas && yarn link && \
 cd /var/modules/sdk-coin-mon && yarn link && \
 cd /var/modules/sdk-coin-near && yarn link && \
 cd /var/modules/sdk-coin-oas && yarn link && \
@@ -298,6 +300,7 @@ RUN cd /var/bitgo-express && \
     yarn link @bitgo/sdk-coin-initia && \
     yarn link @bitgo/sdk-coin-injective && \
     yarn link @bitgo/sdk-coin-islm && \
+    yarn link @bitgo/sdk-coin-kas && \
     yarn link @bitgo/sdk-coin-mon && \
     yarn link @bitgo/sdk-coin-near && \
     yarn link @bitgo/sdk-coin-oas && \

modules/account-lib/package.json

@@ -53,6 +53,7 @@
     "@bitgo/sdk-coin-evm": "^1.14.9",
     "@bitgo/sdk-coin-flr": "^1.10.0",
     "@bitgo/sdk-coin-flrp": "^1.11.0",
+    "@bitgo/sdk-coin-kas": "^1.0.0",
     "@bitgo/sdk-coin-hash": "^3.9.0",
     "@bitgo/sdk-coin-hbar": "^2.7.0",
     "@bitgo/sdk-coin-icp": "^1.22.0",

modules/account-lib/src/index.ts

@@ -212,6 +212,9 @@ export { Canton };
 import { FlrPLib as FlrP } from '@bitgo/sdk-coin-flrp';
 export { FlrP };
 
+import * as Kas from '@bitgo/sdk-coin-kas';
+export { Kas };
+
 import { MIDNIGHT_TNC_HASH } from './utils';
 export { MIDNIGHT_TNC_HASH };
 
@@ -330,6 +333,8 @@ const coinBuilderMap = {
   tcanton: Canton.TransactionBuilderFactory,
   flrp: FlrP.TransactionBuilderFactory,
   tflrp: FlrP.TransactionBuilderFactory,
+  kas: Kas.TransactionBuilderFactory,
+  tkas: Kas.TransactionBuilderFactory,
 };
 
 const coinMessageBuilderFactoryMap = {

modules/account-lib/tsconfig.json

@@ -76,6 +76,9 @@
     {
       "path": "../sdk-coin-injective"
     },
+    {
+      "path": "../sdk-coin-kas"
+    },
     {
       "path": "../sdk-coin-islm"
     },

modules/bitgo/package.json

@@ -84,6 +84,7 @@
     "@bitgo/sdk-coin-evm": "^1.14.9",
     "@bitgo/sdk-coin-flr": "^1.10.0",
     "@bitgo/sdk-coin-flrp": "^1.11.0",
+    "@bitgo/sdk-coin-kas": "^1.0.0",
     "@bitgo/sdk-coin-hash": "^3.9.0",
     "@bitgo/sdk-coin-hbar": "^2.7.0",
     "@bitgo/sdk-coin-icp": "^1.22.0",

modules/bitgo/src/v2/coinFactory.ts

@@ -87,6 +87,8 @@ import {
   EvmCoin,
   Flr,
   Flrp,
+  Kas,
+  TKas,
   FlrToken,
   HashToken,
   MonToken,
@@ -282,6 +284,7 @@ export function registerCoinConstructors(coinFactory: CoinFactory, coinMap: Coin
   coinFactory.register('fiatusd', FiatUsd.createInstance);
   coinFactory.register('flr', Flr.createInstance);
   coinFactory.register('flrp', Flrp.createInstance);
+  coinFactory.register('kas', Kas.createInstance);
   coinFactory.register('gteth', Gteth.createInstance);
   coinFactory.register('hash', Hash.createInstance);
   coinFactory.register('hbar', Hbar.createInstance);
@@ -354,6 +357,7 @@ export function registerCoinConstructors(coinFactory: CoinFactory, coinMap: Coin
   coinFactory.register('tfiatusd', TfiatUsd.createInstance);
   coinFactory.register('tflr', Tflr.createInstance);
   coinFactory.register('tflrp', Flrp.createInstance);
+  coinFactory.register('tkas', TKas.createInstance);
   coinFactory.register('tmon', Tmon.createInstance);
   coinFactory.register('thash', Thash.createInstance);
   coinFactory.register('thbar', Thbar.createInstance);
@@ -709,6 +713,8 @@ export function getCoinConstructor(coinName: string): CoinConstructor | undefine
       return Flr.createInstance;
     case 'flrp':
       return Flrp.createInstance;
+    case 'kas':
+      return Kas.createInstance;
     case 'gteth':
       return Gteth.createInstance;
     case 'hash':
@@ -853,6 +859,8 @@ export function getCoinConstructor(coinName: string): CoinConstructor | undefine
       return Tflr.createInstance;
     case 'tflrp':
       return Flrp.createInstance;
+    case 'tkas':
+      return TKas.createInstance;
     case 'tmon':
       return Tmon.createInstance;
     case 'thash':

modules/bitgo/src/v2/coins/index.ts

@@ -34,6 +34,7 @@ import { Erc20Token, Erc721Token, Eth, Gteth, Hteth, Teth } from '@bitgo/sdk-coi
 import { EvmCoin, EthLikeErc20Token, EthLikeErc721Token } from '@bitgo/sdk-coin-evm';
 import { Flr, Tflr, FlrToken } from '@bitgo/sdk-coin-flr';
 import { Flrp } from '@bitgo/sdk-coin-flrp';
+import { Kas, TKas } from '@bitgo/sdk-coin-kas';
 import { Ethw } from '@bitgo/sdk-coin-ethw';
 import { EthLikeCoin, TethLikeCoin } from '@bitgo/sdk-coin-ethlike';
 import { Hash, Thash, HashToken } from '@bitgo/sdk-coin-hash';
@@ -113,6 +114,7 @@ export { Etc, Tetc };
 export { EvmCoin, EthLikeErc20Token, EthLikeErc721Token };
 export { Flr, Tflr, FlrToken };
 export { Flrp };
+export { Kas, TKas };
 export { Hash, Thash, HashToken };
 export { Hbar, Thbar };
 export { Icp, Ticp };

modules/bitgo/tsconfig.json

@@ -179,6 +179,9 @@
     {
       "path": "../sdk-coin-injective"
     },
+    {
+      "path": "../sdk-coin-kas"
+    },
     {
       "path": "../sdk-coin-iota"
     },

modules/sdk-coin-kas/.eslintignore

@@ -0,0 +1,4 @@
+node_modules
+.idea
+public
+dist