feat(statics): update sepeth underlying asset

@stacks/transactions signWithKey passes the message to elliptic as hex.
With bn.js@5 (CI when elliptic's nested bn.js@4 is not used), non-hex
messages like 'hello' throw. Switch message2 to valid hex and regenerate
the expected signature so unit tests pass under either layout.

TICKET: CECHO-1721

Author: rithwik-bitgo

modules/sdk-coin-stx/test/unit/resources.ts

@@ -67,10 +67,10 @@ export const message1 = 'abc';
 export const expectedSignature1 =
   '0157a170fae4a310c4b59b8d173289b4adacb79b0a187a6e132cdf02374c22b59519b862d95240af464808faaed341fe42d740c9b89850b52f5f7f906deba67064';
 
-export const message2 = 'hello';
+export const message2 = 'deadbeef';
 // when signed with secretKey2
 export const expectedSignature2 =
-  '007a86b0a5486987605f7274272cb4eaefa37af216bdf0c88c5b985a70923d550032b3cf226a8384ad2b96d0b3794b9a6f8e6ed191582fb0cc4f830b2ef14d05fe';
+  '00693746b1f54b0ca50566dc51ebd55484948b4bc440287f73a9fc8ac2e9acfc3a1ef1958bb32cc19eccb70af911fc8130f269d5ff382351a23751f847fc781372';
 
 // seed is Buffer.alloc(64) -- all zero bytes
 export const defaultSeedSecretKey = 'eafd15702fca3f80beb565e66f19e20bbad0a34b46bb12075cbf1c5d94bb27d2';

modules/statics/src/allCoinsAndTokens.ts

@@ -407,7 +407,7 @@ export const allCoinsAndTokens = [
     'Sepolia Testnet Ethereum',
     Networks.test.sepolia,
     18,
-    UnderlyingAsset.ETH,
+    UnderlyingAsset.SEPETH,
     BaseUnit.ETH,
     [
       ...ETH_FEATURES_WITH_STAKING_AND_MMI,

modules/statics/src/base.ts

@@ -728,6 +728,7 @@ export enum UnderlyingAsset {
   SCROLLETH = 'scrolleth', // Scroll L2
   SEI = 'sei',
   SEIEVM = 'seievm',
+  SEPETH = 'sepeth', // Sepolia Ethereum testnet
   SGB = 'sgb',
   SOL = 'sol',
   SOMI = 'somi', // Somnia Chain

modules/statics/src/coins/ofcCoins.ts

@@ -846,7 +846,7 @@ export const ofcCoins = [
     'ofctsepeth',
     'Test Sepolia Ether',
     18,
-    UnderlyingAsset.ETH,
+    UnderlyingAsset.SEPETH,
     CoinKind.CRYPTO
   ),
   tofc(

modules/statics/src/networks.ts

@@ -874,7 +874,7 @@ class Sepolia extends Testnet implements EthereumNetwork {
   chainId = 11155111;
   nativeCoinOperationHashPrefix = 'ETHER';
   tokenOperationHashPrefix = 'ERC20';
-  // TODO: add batcher/forwarder/wallet contract addresses once deployed on Sepolia
+  // TODO: [CECHO-1729] add batcher/forwarder/wallet contract addresses once deployed on Sepolia
 }
 
 class EthereumClassic extends Mainnet implements EthereumNetwork {