diff --git a/Cargo.lock b/Cargo.lock
index 14a81bc501d..79c7b155ace 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3831,6 +3831,7 @@ dependencies = [
  "dashcore",
  "key-wallet",
  "rayon",
+ "serde",
  "tokio",
  "tracing",
  "zeroize",
@@ -4835,6 +4836,7 @@ dependencies = [
  "key-wallet-manager",
  "platform-encryption",
  "rand 0.8.6",
+ "serde",
  "serde_json",
  "sha2",
  "static_assertions",
diff --git a/packages/rs-platform-wallet/Cargo.toml b/packages/rs-platform-wallet/Cargo.toml
index 846e736e94a..d812c764b9b 100644
--- a/packages/rs-platform-wallet/Cargo.toml
+++ b/packages/rs-platform-wallet/Cargo.toml
@@ -38,6 +38,7 @@ tracing = "0.1"
 # Encoding
 hex = "0.4"
 bs58 = "0.5"
+serde = { version = "1", default-features = false, features = ["derive"], optional = true }
 serde_json = "1.0"
 
 # Image processing (DIP-15 avatar hash + fingerprint)
@@ -69,6 +70,14 @@ default = ["bls", "eddsa"]
 bls = ["key-wallet/bls", "key-wallet-manager/bls"]
 eddsa = ["key-wallet/eddsa", "key-wallet-manager/eddsa"]
 shielded = ["dep:grovedb-commitment-tree", "dep:zip32", "dash-sdk/shielded", "dpp/shielded-client"]
+# Opt-in serde derives on the changeset types. Activates `key-wallet/serde`,
+# `key-wallet-manager/serde`, and `dash-sdk/serde`. `dpp` derives serde unconditionally.
+serde = [
+    "dep:serde",
+    "key-wallet/serde",
+    "key-wallet-manager/serde",
+    "dash-sdk/serde",
+]
 # Forward to the upstream `key-wallet` / `key-wallet-manager`
 # `keep-finalized-transactions` feature. With it OFF (the default),
 # chainlocked transactions are evicted from the in-memory
diff --git a/packages/rs-platform-wallet/src/changeset/changeset.rs b/packages/rs-platform-wallet/src/changeset/changeset.rs
index 04f3ebe254a..00a9e39706b 100644
--- a/packages/rs-platform-wallet/src/changeset/changeset.rs
+++ b/packages/rs-platform-wallet/src/changeset/changeset.rs
@@ -79,6 +79,7 @@ use crate::wallet::identity::{ContactRequest, DashPayProfile, EstablishedContact
 /// upstream type. Tests that need to inspect a changeset's contents
 /// reach into individual fields directly.
 #[derive(Debug, Clone, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct CoreChangeSet {
     /// Transaction records produced by this batch.
     ///
@@ -257,6 +258,7 @@ impl Merge for CoreChangeSet {
 /// call [`IdentityEntry::from_managed`] to produce a fresh scalar
 /// snapshot so the merge can resolve the latest state by last-write-wins.
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct IdentityEntry {
     /// Identity identifier.
     pub id: Identifier,
@@ -331,6 +333,7 @@ impl IdentityEntry {
 /// path — platform-wallet itself never carries or persists the key
 /// bytes.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct IdentityKeyDerivationIndices {
     /// DIP-9 identity index (hardened).
     pub identity_index: u32,
@@ -351,6 +354,7 @@ pub struct IdentityKeyDerivationIndices {
 /// persist it. When either is `None` the key is watch-only from
 /// this wallet's point of view.
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct IdentityKeyEntry {
     /// Owning identity.
     pub identity_id: Identifier,
@@ -379,6 +383,7 @@ pub struct IdentityKeyEntry {
 /// `{upsert, remove}` per key per mutation — the merge does not resolve
 /// insert-vs-tombstone for the same key.
 #[derive(Debug, Clone, Default, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct IdentityKeysChangeSet {
     /// Inserted or updated identity keys keyed by (identity_id, key_id).
     pub upserts: BTreeMap<(Identifier, KeyID), IdentityKeyEntry>,
@@ -415,6 +420,7 @@ impl Merge for IdentityKeysChangeSet {
 /// [`ContactChangeSet`]; same mitigation: every current emitter
 /// produces only one of {insert, tombstone} per key per mutation.
 #[derive(Debug, Clone, Default, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct IdentityChangeSet {
     /// Inserted or updated identities keyed by identifier.
     pub identities: BTreeMap<Identifier, IdentityEntry>,
@@ -500,6 +506,7 @@ impl Merge for IdentityChangeSet {
 ///
 /// Modelled after [`crate::wallet::identity::ContactRequest`].
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ContactRequestEntry {
     /// The contact request.
     pub request: ContactRequest,
@@ -508,6 +515,7 @@ pub struct ContactRequestEntry {
 /// Key for sent contact requests: the **owner** sent a request TO the
 /// **recipient**. Used for `sent_requests` and `removed_sent`.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct SentContactRequestKey {
     /// The identity owned by this wallet (the sender).
     pub owner_id: Identifier,
@@ -519,6 +527,7 @@ pub struct SentContactRequestKey {
 /// FROM the **sender**. Used for `incoming_requests` and
 /// `removed_incoming`.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ReceivedContactRequestKey {
     /// The identity owned by this wallet (the recipient).
     pub owner_id: Identifier,
@@ -567,6 +576,7 @@ pub struct ReceivedContactRequestKey {
 /// semantics, the merge impl should resolve `sent_requests ∩
 /// removed_sent` by last-seen rather than carrying both.
 #[derive(Debug, Clone, Default, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ContactChangeSet {
     /// Sent contact requests keyed by (owner → recipient).
     pub sent_requests: BTreeMap<SentContactRequestKey, ContactRequestEntry>,
@@ -629,6 +639,7 @@ impl Merge for ContactChangeSet {
 /// persisters can apply the entry without guessing which account or
 /// HD slot it belongs to.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct PlatformAddressBalanceEntry {
     pub wallet_id: WalletId,
     pub account_index: u32,
@@ -638,6 +649,7 @@ pub struct PlatformAddressBalanceEntry {
 }
 
 #[derive(Debug, Clone, Default, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct PlatformAddressChangeSet {
     /// Updated platform addresses produced by the last sync pass.
     /// A `Vec` rather than a map because the diff already deduplicates
@@ -694,6 +706,7 @@ impl Merge for PlatformAddressChangeSet {
 
 /// Changes to the asset lock store.
 #[derive(Debug, Clone, Default, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct AssetLockChangeSet {
     /// Asset lock entries keyed by outpoint (txid + output index).
     ///
@@ -710,6 +723,7 @@ pub struct AssetLockChangeSet {
 /// Contains all fields needed to fully reconstruct a
 /// [`TrackedAssetLock`](crate::wallet::asset_lock::tracked::TrackedAssetLock).
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct AssetLockEntry {
     /// The outpoint identifying this credit output (txid + vout).
     pub out_point: OutPoint,
@@ -752,6 +766,7 @@ impl Merge for AssetLockChangeSet {
 /// purely in the manager's in-memory cache. Persistence carries only
 /// the post-sync balance updates and tombstones.
 #[derive(Debug, Clone, Default, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct TokenBalanceChangeSet {
     /// Updated token balances keyed by `(identity_id, token_id)`.
     /// Last write wins on merge.
@@ -792,6 +807,7 @@ impl Merge for TokenBalanceChangeSet {
 /// time; the parent `Option<...>` field stays `None` for every other
 /// flush.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct WalletMetadataEntry {
     /// Network the wallet is bound to.
     pub network: Network,
@@ -816,6 +832,7 @@ pub struct WalletMetadataEntry {
 /// is simple `extend` and dedup is the apply-side caller's
 /// responsibility if it ever matters.
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct AccountRegistrationEntry {
     /// The account variant being registered.
     pub account_type: AccountType,
@@ -849,6 +866,7 @@ pub struct AccountRegistrationEntry {
 /// the upstream type. Tests that need to inspect snapshot contents
 /// reach into the `addresses` vec by index instead.
 #[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct AccountAddressPoolEntry {
     /// Which account this pool belongs to.
     pub account_type: AccountType,
@@ -876,6 +894,7 @@ pub struct AccountAddressPoolEntry {
 /// Not `PartialEq` because [`CoreChangeSet`] isn't (its `records` carry
 /// `TransactionRecord`, which is `Debug + Clone` only upstream).
 #[derive(Debug, Clone, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct PlatformWalletChangeSet {
     /// Core-wallet deltas projected from upstream `WalletEvent`s:
     /// transaction records, UTXO add/remove, height checkpoints, IS-lock
diff --git a/packages/rs-platform-wallet/src/changeset/shielded_changeset.rs b/packages/rs-platform-wallet/src/changeset/shielded_changeset.rs
index f6839ae16f1..65d0189d911 100644
--- a/packages/rs-platform-wallet/src/changeset/shielded_changeset.rs
+++ b/packages/rs-platform-wallet/src/changeset/shielded_changeset.rs
@@ -22,6 +22,7 @@ use crate::wallet::shielded::{ShieldedNote, SubwalletId};
 
 /// Aggregated delta of shielded state for one persister flush.
 #[derive(Debug, Clone, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ShieldedChangeSet {
     /// Notes discovered (or re-saved with updated state) per
     /// subwallet. Keyed by `(wallet_id, account_index)`. Order
diff --git a/packages/rs-platform-wallet/src/wallet/asset_lock/tracked.rs b/packages/rs-platform-wallet/src/wallet/asset_lock/tracked.rs
index 83657e4b9fd..766b3f0510d 100644
--- a/packages/rs-platform-wallet/src/wallet/asset_lock/tracked.rs
+++ b/packages/rs-platform-wallet/src/wallet/asset_lock/tracked.rs
@@ -30,6 +30,7 @@ use crate::changeset::AssetLockEntry;
 /// Marking the enum `#[non_exhaustive]` would force wildcard arms
 /// and silently lose that signal.
 #[derive(Debug, Clone, PartialEq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum AssetLockStatus {
     Built,
     Broadcast,
diff --git a/packages/rs-platform-wallet/src/wallet/identity/types/block_time.rs b/packages/rs-platform-wallet/src/wallet/identity/types/block_time.rs
index 7c6e28d039b..b4291e5b57a 100644
--- a/packages/rs-platform-wallet/src/wallet/identity/types/block_time.rs
+++ b/packages/rs-platform-wallet/src/wallet/identity/types/block_time.rs
@@ -7,6 +7,7 @@ use dpp::prelude::{BlockHeight, CoreBlockHeight, TimestampMillis};
 
 /// Block time information containing height, core height, and timestamp
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct BlockTime {
     /// Platform block height
     pub height: BlockHeight,
diff --git a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/contact_request.rs b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/contact_request.rs
index 73a2c45337f..d0b1540a3ce 100644
--- a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/contact_request.rs
+++ b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/contact_request.rs
@@ -8,6 +8,7 @@ use dpp::prelude::{CoreBlockHeight, Identifier};
 
 /// A contact request represents a one-way relationship between two identities
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ContactRequest {
     /// The unique id of the sender (owner of the contact request)
     pub sender_id: Identifier,
diff --git a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/established_contact.rs b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/established_contact.rs
index b1be89ef227..49cfe288d5b 100644
--- a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/established_contact.rs
+++ b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/established_contact.rs
@@ -10,6 +10,7 @@ use dpp::prelude::Identifier;
 ///
 /// This is formed when both identities have sent contact requests to each other.
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct EstablishedContact {
     /// The contact's identity unique identifier
     pub contact_identity_id: Identifier,
diff --git a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/payment.rs b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/payment.rs
index fd1044c0c20..976b64acad3 100644
--- a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/payment.rs
+++ b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/payment.rs
@@ -19,6 +19,7 @@ use dpp::prelude::Identifier;
 
 /// Direction of a DashPay payment, from the owner's point of view.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum PaymentDirection {
     /// The owner sent this payment to the counterparty.
     Sent,
@@ -28,6 +29,7 @@ pub enum PaymentDirection {
 
 /// Status of a DashPay payment on Core chain.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum PaymentStatus {
     /// Broadcast but not yet confirmed.
     #[default]
@@ -63,6 +65,7 @@ pub struct DashpayAddressMatch {
 /// Keyed by transaction id (hex string, matching evo-tool's
 /// `dashpay_payments.tx_id` column which is `TEXT UNIQUE NOT NULL`).
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct PaymentEntry {
     /// The other identity in this payment. Whether they're the
     /// sender or receiver is encoded in `direction`.
diff --git a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/profile.rs b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/profile.rs
index 4082f42035f..06d6d415529 100644
--- a/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/profile.rs
+++ b/packages/rs-platform-wallet/src/wallet/identity/types/dashpay/profile.rs
@@ -21,6 +21,7 @@ use sha2::{Digest, Sha256};
 /// User-facing DashPay profile data published via the DashPay data
 /// contract. This is the **output/stored** model — no raw image bytes.
 #[derive(Debug, Clone, Default, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct DashPayProfile {
     /// Display name (publicly visible, max 25 chars per DIP-15).
     pub display_name: Option<String>,
diff --git a/packages/rs-platform-wallet/src/wallet/identity/types/key_storage.rs b/packages/rs-platform-wallet/src/wallet/identity/types/key_storage.rs
index 4813dca6de5..8dee1a702b9 100644
--- a/packages/rs-platform-wallet/src/wallet/identity/types/key_storage.rs
+++ b/packages/rs-platform-wallet/src/wallet/identity/types/key_storage.rs
@@ -27,6 +27,7 @@ pub enum PrivateKeyData {
 
 /// Identity lifecycle status on Platform.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub enum IdentityStatus {
     #[default]
     Unknown,
@@ -38,6 +39,7 @@ pub enum IdentityStatus {
 
 /// DPNS username associated with an identity.
 #[derive(Debug, Clone, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct DpnsNameInfo {
     pub label: String,
     pub acquired_at: Option<u64>,
diff --git a/packages/rs-platform-wallet/src/wallet/shielded/store.rs b/packages/rs-platform-wallet/src/wallet/shielded/store.rs
index 7268a4f0d0f..038f691cd8b 100644
--- a/packages/rs-platform-wallet/src/wallet/shielded/store.rs
+++ b/packages/rs-platform-wallet/src/wallet/shielded/store.rs
@@ -34,6 +34,7 @@ use crate::wallet::platform_wallet::WalletId;
 /// sync watermarks inside a [`ShieldedStore`] so a single store
 /// can hold state for many wallets/accounts without leakage.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct SubwalletId {
     /// 32-byte wallet identifier (matches `PlatformWallet::wallet_id`).
     pub wallet_id: [u8; 32],
@@ -58,6 +59,7 @@ impl SubwalletId {
 /// `orchard::Note` is in `note_data` as 115 bytes
 /// (`recipient(43) || value(8 LE) || rho(32) || rseed(32)`).
 #[derive(Debug, Clone)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct ShieldedNote {
     /// Global position in the commitment tree.
     pub position: u64,
diff --git a/packages/rs-sdk/src/platform/address_sync/types.rs b/packages/rs-sdk/src/platform/address_sync/types.rs
index 15ce6d82eb7..74daea4609a 100644
--- a/packages/rs-sdk/src/platform/address_sync/types.rs
+++ b/packages/rs-sdk/src/platform/address_sync/types.rs
@@ -49,6 +49,7 @@ pub type LeafBoundaryKey = Vec<u8>;
 
 /// Funds stored for a platform address.
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
+#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
 pub struct AddressFunds {
     /// Address nonce used for anti-replay.
     pub nonce: AddressNonce,