refactor: store mint signer in compressed mint struct

js/compressed-token/src/v3/actions/mint-to-compressed.ts

@@ -83,6 +83,8 @@ export async function mintToCompressed(
             splMint: mintInfo.mintContext!.splMint,
             cmintDecompressed: mintInfo.mintContext!.cmintDecompressed,
             version: mintInfo.mintContext!.version,
+            mintSigner: mintInfo.mintContext!.mintSigner,
+            bump: mintInfo.mintContext!.bump,
             metadata: mintInfo.tokenMetadata
                 ? {
                       updateAuthority:

js/compressed-token/src/v3/actions/mint-to.ts

@@ -79,6 +79,8 @@ export async function mintTo(
             splMint: mintInfo.mintContext!.splMint,
             cmintDecompressed: mintInfo.mintContext!.cmintDecompressed,
             version: mintInfo.mintContext!.version,
+            mintSigner: mintInfo.mintContext!.mintSigner,
+            bump: mintInfo.mintContext!.bump,
             metadata: mintInfo.tokenMetadata
                 ? {
                       updateAuthority:

js/compressed-token/src/v3/instructions/create-mint.ts

@@ -9,7 +9,6 @@ import {
     CTOKEN_PROGRAM_ID,
     LightSystemProgram,
     defaultStaticAccountsStruct,
-    deriveAddressV2,
     TreeInfo,
     AddressTreeInfo,
     ValidityProof,
@@ -95,12 +94,7 @@ function validateProofArrays(
 export function encodeCreateMintInstructionData(
     params: EncodeCreateMintInstructionParams,
 ): Buffer {
-    const [splMintPda] = findMintAddress(params.mintSigner);
-    const compressedAddress = deriveAddressV2(
-        splMintPda.toBytes(),
-        params.addressTree,
-        CTOKEN_PROGRAM_ID,
-    );
+    const [splMintPda, bump] = findMintAddress(params.mintSigner);
 
     // Build extensions if metadata present
     let extensions: { tokenMetadata: TokenMetadataBorshData }[] | null = null;
@@ -141,7 +135,8 @@ export function encodeCreateMintInstructionData(
                 version: TokenDataVersion.ShaFlat,
                 cmintDecompressed: false,
                 mint: splMintPda,
-                compressedAddress: Array.from(compressedAddress.toBytes()),
+                mintSigner: Array.from(params.mintSigner.toBytes()),
+                bump,
             },
             mintAuthority: params.mintAuthority,
             freezeAuthority: params.freezeAuthority,

js/compressed-token/src/v3/instructions/mint-to-compressed.ts

@@ -9,7 +9,6 @@ import {
     CTOKEN_PROGRAM_ID,
     LightSystemProgram,
     defaultStaticAccountsStruct,
-    deriveAddressV2,
     getDefaultAddressTreeInfo,
     MerkleContext,
     TreeInfo,
@@ -36,12 +35,6 @@ interface EncodeCompressedMintToInstructionParams {
 function encodeCompressedMintToInstructionData(
     params: EncodeCompressedMintToInstructionParams,
 ): Buffer {
-    const compressedAddress = deriveAddressV2(
-        params.mintData.splMint.toBytes(),
-        params.addressTree,
-        CTOKEN_PROGRAM_ID,
-    );
-
     // TokenMetadata extension not supported in mintTo instruction
     if (params.mintData.metadata) {
         throw new Error(
@@ -75,7 +68,8 @@ function encodeCompressedMintToInstructionData(
                 version: params.mintData.version,
                 cmintDecompressed: params.mintData.cmintDecompressed,
                 mint: params.mintData.splMint,
-                compressedAddress: Array.from(compressedAddress.toBytes()),
+                mintSigner: Array.from(params.mintData.mintSigner),
+                bump: params.mintData.bump,
             },
             mintAuthority: params.mintData.mintAuthority,
             freezeAuthority: params.mintData.freezeAuthority,

js/compressed-token/src/v3/instructions/mint-to-interface.ts

@@ -69,6 +69,8 @@ export function createMintToInterfaceInstruction(
         splMint: mintInterface.mintContext.splMint,
         cmintDecompressed: mintInterface.mintContext.cmintDecompressed,
         version: mintInterface.mintContext.version,
+        mintSigner: mintInterface.mintContext.mintSigner,
+        bump: mintInterface.mintContext.bump,
         metadata: mintInterface.tokenMetadata
             ? {
                   updateAuthority:

js/compressed-token/src/v3/instructions/mint-to.ts

@@ -9,7 +9,6 @@ import {
     CTOKEN_PROGRAM_ID,
     LightSystemProgram,
     defaultStaticAccountsStruct,
-    deriveAddressV2,
     getDefaultAddressTreeInfo,
     MerkleContext,
     TreeInfo,
@@ -34,12 +33,6 @@ interface EncodeMintToCTokenInstructionParams {
 function encodeMintToCTokenInstructionData(
     params: EncodeMintToCTokenInstructionParams,
 ): Buffer {
-    const compressedAddress = deriveAddressV2(
-        params.mintData.splMint.toBytes(),
-        params.addressTree,
-        CTOKEN_PROGRAM_ID,
-    );
-
     // TokenMetadata extension not supported in mintTo instruction
     if (params.mintData.metadata) {
         throw new Error(
@@ -70,7 +63,8 @@ function encodeMintToCTokenInstructionData(
                 version: params.mintData.version,
                 cmintDecompressed: params.mintData.cmintDecompressed,
                 mint: params.mintData.splMint,
-                compressedAddress: Array.from(compressedAddress.toBytes()),
+                mintSigner: Array.from(params.mintData.mintSigner),
+                bump: params.mintData.bump,
             },
             mintAuthority: params.mintData.mintAuthority,
             freezeAuthority: params.mintData.freezeAuthority,

js/compressed-token/src/v3/instructions/update-metadata.ts

@@ -9,7 +9,6 @@ import {
     CTOKEN_PROGRAM_ID,
     LightSystemProgram,
     defaultStaticAccountsStruct,
-    deriveAddressV2,
     getDefaultAddressTreeInfo,
     getOutputQueue,
 } from '@lightprotocol/stateless.js';
@@ -82,12 +81,6 @@ function convertActionToBorsh(action: UpdateMetadataAction): Action {
 function encodeUpdateMetadataInstructionData(
     params: EncodeUpdateMetadataInstructionParams,
 ): Buffer {
-    const compressedAddress = deriveAddressV2(
-        params.splMint.toBytes(),
-        params.addressTree,
-        CTOKEN_PROGRAM_ID,
-    );
-
     const mintInterface = params.mintInterface;
 
     if (!mintInterface.tokenMetadata) {
@@ -112,7 +105,8 @@ function encodeUpdateMetadataInstructionData(
                 version: mintInterface.mintContext!.version,
                 cmintDecompressed: mintInterface.mintContext!.cmintDecompressed,
                 mint: mintInterface.mintContext!.splMint,
-                compressedAddress: Array.from(compressedAddress.toBytes()),
+                mintSigner: Array.from(mintInterface.mintContext!.mintSigner),
+                bump: mintInterface.mintContext!.bump,
             },
             mintAuthority: mintInterface.mint.mintAuthority,
             freezeAuthority: mintInterface.mint.freezeAuthority,

js/compressed-token/src/v3/instructions/update-mint.ts

@@ -9,7 +9,6 @@ import {
     CTOKEN_PROGRAM_ID,
     LightSystemProgram,
     defaultStaticAccountsStruct,
-    deriveAddressV2,
     getDefaultAddressTreeInfo,
     getOutputQueue,
 } from '@lightprotocol/stateless.js';
@@ -37,12 +36,6 @@ interface EncodeUpdateMintInstructionParams {
 function encodeUpdateMintInstructionData(
     params: EncodeUpdateMintInstructionParams,
 ): Buffer {
-    const compressedAddress = deriveAddressV2(
-        params.splMint.toBytes(),
-        params.addressTree,
-        CTOKEN_PROGRAM_ID,
-    );
-
     // Build action
     const action: Action =
         params.actionType === 'mintAuthority'
@@ -86,7 +79,10 @@ function encodeUpdateMintInstructionData(
                 cmintDecompressed:
                     params.mintInterface.mintContext!.cmintDecompressed,
                 mint: params.mintInterface.mintContext!.splMint,
-                compressedAddress: Array.from(compressedAddress.toBytes()),
+                mintSigner: Array.from(
+                    params.mintInterface.mintContext!.mintSigner,
+                ),
+                bump: params.mintInterface.mintContext!.bump,
             },
             mintAuthority: params.mintInterface.mint.mintAuthority,
             freezeAuthority: params.mintInterface.mint.freezeAuthority,

js/compressed-token/src/v3/layout/layout-mint-action.ts

@@ -142,7 +142,8 @@ export const CompressedMintMetadataLayout = struct([
     u8('version'),
     bool('cmintDecompressed'),
     publicKey('mint'),
-    array(u8(), 32, 'compressedAddress'),
+    array(u8(), 32, 'mintSigner'),
+    u8('bump'),
 ]);
 
 export const CompressedMintInstructionDataLayout = struct([
@@ -309,7 +310,8 @@ export interface CompressedMintMetadata {
     version: number;
     cmintDecompressed: boolean;
     mint: PublicKey;
-    compressedAddress: number[];
+    mintSigner: number[];
+    bump: number;
 }
 
 export interface CompressedMintInstructionData {

js/compressed-token/src/v3/layout/layout-mint.ts

@@ -37,6 +37,10 @@ export interface MintContext {
     cmintDecompressed: boolean;
     /** PDA of the associated SPL mint */
     splMint: PublicKey;
+    /** Signer pubkey used to derive the mint PDA */
+    mintSigner: Uint8Array;
+    /** Bump seed for the mint PDA */
+    bump: number;
 }
 
 /**
@@ -95,6 +99,9 @@ export interface CompressedMint {
 }
 
 /** MintContext as stored by the program */
+/**
+ * Raw mint context for layout encoding (mintSigner and bump are encoded separately)
+ */
 export interface RawMintContext {
     version: number;
     cmintDecompressed: number; // bool as u8
@@ -108,11 +115,15 @@ export const MintContextLayout = struct<RawMintContext>([
     publicKey('splMint'),
 ]);
 
-/** Byte length of MintContext */
+/** Byte length of MintContext (excluding mintSigner and bump which are read separately) */
 export const MINT_CONTEXT_SIZE = MintContextLayout.span; // 34 bytes
 
-/** Reserved bytes for T22 layout compatibility */
-export const RESERVED_SIZE = 49;
+/** Additional bytes for mintSigner (32) + bump (1) */
+export const MINT_SIGNER_SIZE = 32;
+export const BUMP_SIZE = 1;
+
+/** Reserved bytes for T22 layout compatibility (padding to reach byte 165) */
+export const RESERVED_SIZE = 16;
 
 /** Account type discriminator size */
 export const ACCOUNT_TYPE_SIZE = 1;
@@ -323,6 +334,12 @@ export function deserializeMint(data: Buffer | Uint8Array): CompressedMint {
     );
     offset += MINT_CONTEXT_SIZE;
 
+    // 2b. Read mintSigner (32 bytes) and bump (1 byte)
+    const mintSigner = buffer.slice(offset, offset + MINT_SIGNER_SIZE);
+    offset += MINT_SIGNER_SIZE;
+    const bump = buffer.readUInt8(offset);
+    offset += BUMP_SIZE;
+
     // 3. Read reserved bytes (49 bytes) for T22 compatibility
     const reserved = buffer.slice(offset, offset + RESERVED_SIZE);
     offset += RESERVED_SIZE;
@@ -386,6 +403,8 @@ export function deserializeMint(data: Buffer | Uint8Array): CompressedMint {
         version: rawContext.version,
         cmintDecompressed: rawContext.cmintDecompressed !== 0,
         splMint: rawContext.splMint,
+        mintSigner,
+        bump,
     };
 
     const mint: CompressedMint = {
@@ -487,6 +506,10 @@ export function serializeMint(mint: CompressedMint): Buffer {
     );
     buffers.push(contextBuffer);
 
+    // 2b. Encode mintSigner (32 bytes) and bump (1 byte)
+    buffers.push(Buffer.from(mint.mintContext.mintSigner));
+    buffers.push(Buffer.from([mint.mintContext.bump]));
+
     // 3. Encode reserved bytes (49 bytes) - default to zeros
     const reserved = mint.reserved ?? new Uint8Array(RESERVED_SIZE);
     buffers.push(Buffer.from(reserved));
@@ -663,6 +686,10 @@ export interface MintInstructionData {
     splMint: PublicKey;
     cmintDecompressed: boolean;
     version: number;
+    /** Signer pubkey used to derive the mint PDA */
+    mintSigner: Uint8Array;
+    /** Bump seed for the mint PDA */
+    bump: number;
     metadata?: MintMetadataField;
 }
 
@@ -705,6 +732,8 @@ export function toMintInstructionData(
         splMint: mintContext.splMint,
         cmintDecompressed: mintContext.cmintDecompressed,
         version: mintContext.version,
+        mintSigner: mintContext.mintSigner,
+        bump: mintContext.bump,
         metadata,
     };
 }