diff --git a/model/client/account/account_lines_request.go b/model/client/account/account_lines_request.go
index 825466f0..c5bbf6c3 100644
--- a/model/client/account/account_lines_request.go
+++ b/model/client/account/account_lines_request.go
@@ -23,13 +23,19 @@ func (*AccountLinesRequest) Method() string {
 
 func (r *AccountLinesRequest) Validate() error {
 	if err := r.Account.Validate(); err != nil {
-		return fmt.Errorf("account lines request: %w", err)
+		return fmt.Errorf("account lines request account: %w", err)
 	}
 
 	if r.Limit != 0 && (r.Limit < 10 || r.Limit > 400) {
 		return fmt.Errorf("account lines request: invalid limit, must be 10 <= limit <= 400")
 	}
 
+	if r.Peer != "" {
+		if err := r.Peer.Validate(); err != nil {
+			return fmt.Errorf("account lines request peer: %w", err)
+		}
+	}
+
 	return nil
 }
 func (r *AccountLinesRequest) UnmarshalJSON(data []byte) error {
diff --git a/model/client/admin/data/download_shard_request.go b/model/client/admin/data/download_shard_request.go
index 4ad3d0db..b4cdfb3d 100644
--- a/model/client/admin/data/download_shard_request.go
+++ b/model/client/admin/data/download_shard_request.go
@@ -1,6 +1,10 @@
 package data
 
-import "github.com/xyield/xrpl-go/model/client/common"
+import (
+	"fmt"
+
+	"github.com/xyield/xrpl-go/model/client/common"
+)
 
 type DownloadShardRequest struct {
 	Shards []ShardDescriptor `json:"shards"`
@@ -15,6 +19,9 @@ func (*DownloadShardRequest) Method() string {
 	return "download_shard"
 }
 
-func (*DownloadShardRequest) Validate() error {
+func (d *DownloadShardRequest) Validate() error {
+	if len(d.Shards) == 0 {
+		return fmt.Errorf("download shard request: no shard descriptors provided")
+	}
 	return nil
 }
diff --git a/model/client/admin/key/wallet_propose_request.go b/model/client/admin/key/wallet_propose_request.go
index e61e6fa7..27f36e0e 100644
--- a/model/client/admin/key/wallet_propose_request.go
+++ b/model/client/admin/key/wallet_propose_request.go
@@ -1,5 +1,7 @@
 package key
 
+import "fmt"
+
 type WalletProposeRequest struct {
 	KeyType    string `json:"key_type,omitempty"`
 	Passphrase string `json:"passphrase,omitempty"`
@@ -11,6 +13,19 @@ func (*WalletProposeRequest) Method() string {
 	return "wallet_propose"
 }
 
-func (*WalletProposeRequest) Validate() error {
+func (p *WalletProposeRequest) Validate() error {
+	cnt := 0
+	if p.Passphrase != "" {
+		cnt++
+	}
+	if p.Seed != "" {
+		cnt++
+	}
+	if p.SeedHex != "" {
+		cnt++
+	}
+	if cnt > 1 {
+		return fmt.Errorf("wallet propose request: only one of (passphrase, seed, seedhex) may be set")
+	}
 	return nil
 }
diff --git a/model/client/admin/peer/connect_request.go b/model/client/admin/peer/connect_request.go
index c8acf829..177eaf42 100644
--- a/model/client/admin/peer/connect_request.go
+++ b/model/client/admin/peer/connect_request.go
@@ -1,5 +1,7 @@
 package peer
 
+import "fmt"
+
 type ConnectRequest struct {
 	IP   string `json:"ip"`
 	Port int    `json:"port,omitempty"`
@@ -9,6 +11,9 @@ func (*ConnectRequest) Method() string {
 	return "connect"
 }
 
-func (*ConnectRequest) Validate() error {
+func (c *ConnectRequest) Validate() error {
+	if c.IP == "" {
+		return fmt.Errorf("connect request: missing ip")
+	}
 	return nil
 }
diff --git a/model/client/admin/peer/peer_reservations_add_request.go b/model/client/admin/peer/peer_reservations_add_request.go
index e763ec87..a8da95fd 100644
--- a/model/client/admin/peer/peer_reservations_add_request.go
+++ b/model/client/admin/peer/peer_reservations_add_request.go
@@ -1,5 +1,7 @@
 package peer
 
+import "fmt"
+
 type PeerReservationAddRequest struct {
 	PublicKey   string `json:"public_key"`
 	Description string `json:"description,omitempty"`
@@ -9,6 +11,9 @@ func (*PeerReservationAddRequest) Method() string {
 	return "peer_reservations_add"
 }
 
-func (*PeerReservationAddRequest) Validate() error {
+func (r *PeerReservationAddRequest) Validate() error {
+	if r.PublicKey == "" {
+		return fmt.Errorf("peer reservation add request: missing publickey")
+	}
 	return nil
 }
diff --git a/model/client/admin/peer/peer_reservations_del_request.go b/model/client/admin/peer/peer_reservations_del_request.go
index f2262fbc..34e9f49e 100644
--- a/model/client/admin/peer/peer_reservations_del_request.go
+++ b/model/client/admin/peer/peer_reservations_del_request.go
@@ -1,5 +1,7 @@
 package peer
 
+import "fmt"
+
 type PeerReservationDelRequest struct {
 	PublicKey string `json:"public_key"`
 }
@@ -8,6 +10,9 @@ func (*PeerReservationDelRequest) Method() string {
 	return "peer_reservations_del"
 }
 
-func (*PeerReservationDelRequest) Validate() error {
+func (r *PeerReservationDelRequest) Validate() error {
+	if r.PublicKey == "" {
+		return fmt.Errorf("peer reservation del request: missing publickey")
+	}
 	return nil
 }
diff --git a/model/client/admin/signing/sign_for_request.go b/model/client/admin/signing/sign_for_request.go
index b4f56219..523641e4 100644
--- a/model/client/admin/signing/sign_for_request.go
+++ b/model/client/admin/signing/sign_for_request.go
@@ -31,6 +31,23 @@ func (r *SignForRequest) Validate() error {
 		return fmt.Errorf("sign for request: empty tx")
 	}
 
+	cnt := 0
+	if r.Secret != "" {
+		cnt++
+	}
+	if r.Seed != "" {
+		cnt++
+	}
+	if r.SeedHex != "" {
+		cnt++
+	}
+	if r.Passphrase != "" {
+		cnt++
+	}
+	if cnt != 1 {
+		return fmt.Errorf("sign for request: must provide one of (secret, seed, seedhex, passphrase)")
+	}
+
 	return nil
 }
 
diff --git a/model/client/channel/channel_authorize_request.go b/model/client/channel/channel_authorize_request.go
index 26513d26..9ec03f41 100644
--- a/model/client/channel/channel_authorize_request.go
+++ b/model/client/channel/channel_authorize_request.go
@@ -24,7 +24,25 @@ func (r *ChannelAuthorizeRequest) Validate() error {
 	if r.ChannelID == "" {
 		return fmt.Errorf("channel authorize request: missing channel id")
 	}
-
+	var set []string
+	if r.Secret != "" {
+		set = append(set, "secret")
+	}
+	if r.Seed != "" {
+		set = append(set, "seed")
+	}
+	if r.SeedHex != "" {
+		set = append(set, "seed_hex")
+	}
+	if r.Passphrase != "" {
+		set = append(set, "passphrase")
+	}
+	if len(set) == 0 {
+		return fmt.Errorf("channel authorize request: at least one of (secret, seed, seed_hex, passphrase) must be set")
+	}
+	if len(set) > 1 {
+		return fmt.Errorf("channel authorize request: only one signing method required, currently set %v", set)
+	}
 	return nil
 }
 
diff --git a/model/client/channel/channel_authorize_test.go b/model/client/channel/channel_authorize_test.go
index 907bb8ab..13d09dc2 100644
--- a/model/client/channel/channel_authorize_test.go
+++ b/model/client/channel/channel_authorize_test.go
@@ -50,5 +50,15 @@ func TestChannelAuthorizeValidate(t *testing.T) {
 		ChannelID: "abc",
 	}
 	err = s.Validate()
+	assert.ErrorContains(t, err, "seed")
+	s = ChannelAuthorizeRequest{
+		ChannelID: "abc",
+		Seed:      "123",
+	}
+	err = s.Validate()
 	assert.Nil(t, err)
+	s.Secret = "def"
+	err = s.Validate()
+	assert.ErrorContains(t, err, "seed")
+	assert.ErrorContains(t, err, "secret")
 }
diff --git a/model/client/channel/channel_verify_request.go b/model/client/channel/channel_verify_request.go
index 4a4b18a8..f3bede1b 100644
--- a/model/client/channel/channel_verify_request.go
+++ b/model/client/channel/channel_verify_request.go
@@ -1,10 +1,14 @@
 package channel
 
-import "github.com/xyield/xrpl-go/model/transactions/types"
+import (
+	"fmt"
+
+	"github.com/xyield/xrpl-go/model/transactions/types"
+)
 
 type ChannelVerifyRequest struct {
 	Amount    types.XRPCurrencyAmount `json:"amount"`
-	ChannelID string                  `json:"channel_id"`
+	ChannelID types.Hash256           `json:"channel_id"`
 	PublicKey string                  `json:"public_key"`
 	Signature string                  `json:"signature"`
 }
@@ -13,6 +17,15 @@ func (*ChannelVerifyRequest) Method() string {
 	return "channel_verify"
 }
 
-func (*ChannelVerifyRequest) Validate() error {
+func (r *ChannelVerifyRequest) Validate() error {
+	if err := r.ChannelID.Validate(); err != nil {
+		return fmt.Errorf("channel verify request: channel id: %w", err)
+	}
+	if r.PublicKey == "" {
+		return fmt.Errorf("channel verify request: public key not set")
+	}
+	if r.Signature == "" {
+		return fmt.Errorf("channel verify request: signature not set")
+	}
 	return nil
 }
diff --git a/model/client/clio/nft_info_request.go b/model/client/clio/nft_info_request.go
index c12f2369..962327e7 100644
--- a/model/client/clio/nft_info_request.go
+++ b/model/client/clio/nft_info_request.go
@@ -2,6 +2,7 @@ package clio
 
 import (
 	"encoding/json"
+	"fmt"
 
 	"github.com/xyield/xrpl-go/model/client/common"
 	"github.com/xyield/xrpl-go/model/transactions/types"
@@ -17,7 +18,10 @@ func (*NFTInfoRequest) Method() string {
 	return "nft_info"
 }
 
-func (*NFTInfoRequest) Validate() error {
+func (r *NFTInfoRequest) Validate() error {
+	if err := r.NFTokenID.Validate(); err != nil {
+		return fmt.Errorf("nft info request: %w", err)
+	}
 	return nil
 }
 
diff --git a/model/client/ledger/ledger_entry_request.go b/model/client/ledger/ledger_entry_request.go
index f85915e9..d7f1ab05 100644
--- a/model/client/ledger/ledger_entry_request.go
+++ b/model/client/ledger/ledger_entry_request.go
@@ -22,6 +22,7 @@ type LedgerEntryRequest struct {
 	PaymentChannel string                 `json:"payment_channel,omitempty"`
 	DepositPreauth EntryRequestOrString   `json:"deposit_preauth,omitempty"`
 	Ticket         EntryRequestOrString   `json:"ticket,omitempty"`
+	NFTPage        string                 `json:"nft_page,omitempty"`
 }
 
 func (*LedgerEntryRequest) Method() string {
@@ -58,7 +59,7 @@ func (r *LedgerEntryRequest) Validate() error {
 
 	if r.RippleState != nil {
 		setCount++
-		if err := r.Offer.Validate(); err != nil {
+		if err := r.RippleState.Validate(); err != nil {
 			return fmt.Errorf("ledger entry ripple state: %w", err)
 		}
 	}
@@ -92,6 +93,10 @@ func (r *LedgerEntryRequest) Validate() error {
 		}
 	}
 
+	if r.NFTPage != "" {
+		setCount++
+	}
+
 	if setCount != 1 {
 		return fmt.Errorf("ledger entry: exactly one ledger entry object may be requested, found %d", setCount)
 	}
diff --git a/model/client/server/manifest_request.go b/model/client/server/manifest_request.go
index 2aae6dca..a2da5ad5 100644
--- a/model/client/server/manifest_request.go
+++ b/model/client/server/manifest_request.go
@@ -1,5 +1,7 @@
 package server
 
+import "fmt"
+
 type ManifestRequest struct {
 	PublicKey string `json:"public_key"`
 }
@@ -8,6 +10,9 @@ func (*ManifestRequest) Method() string {
 	return "manifest"
 }
 
-func (*ManifestRequest) Validate() error {
+func (r *ManifestRequest) Validate() error {
+	if r.PublicKey == "" {
+		return fmt.Errorf("manifest request: public key not set")
+	}
 	return nil
 }
diff --git a/model/client/transactions/submit_multisigned_request.go b/model/client/transactions/submit_multisigned_request.go
index e6d6d6dc..ca4a9ee2 100644
--- a/model/client/transactions/submit_multisigned_request.go
+++ b/model/client/transactions/submit_multisigned_request.go
@@ -2,6 +2,7 @@ package transactions
 
 import (
 	"encoding/json"
+	"fmt"
 
 	"github.com/xyield/xrpl-go/model/transactions"
 )
@@ -36,6 +37,9 @@ func (r *SubmitMultisignedRequest) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
-func (*SubmitMultisignedRequest) Validate() error {
+func (s *SubmitMultisignedRequest) Validate() error {
+	if s.Tx == nil {
+		return fmt.Errorf("submit multisigned request: missing tx")
+	}
 	return nil
 }
diff --git a/model/client/transactions/submit_request.go b/model/client/transactions/submit_request.go
index 45cea96f..c3fc30fd 100644
--- a/model/client/transactions/submit_request.go
+++ b/model/client/transactions/submit_request.go
@@ -1,5 +1,7 @@
 package transactions
 
+import "fmt"
+
 type SubmitRequest struct {
 	TxBlob   string `json:"tx_blob"`
 	FailHard bool   `json:"fail_hard,omitempty"`
@@ -9,6 +11,9 @@ func (*SubmitRequest) Method() string {
 	return "submit"
 }
 
-func (*SubmitRequest) Validate() error {
+func (s *SubmitRequest) Validate() error {
+	if s.TxBlob == "" {
+		return fmt.Errorf("submit request: missing txblob")
+	}
 	return nil
 }
diff --git a/model/client/transactions/transaction_entry_request.go b/model/client/transactions/transaction_entry_request.go
index 835aaa3b..5ebf9cd6 100644
--- a/model/client/transactions/transaction_entry_request.go
+++ b/model/client/transactions/transaction_entry_request.go
@@ -2,6 +2,7 @@ package transactions
 
 import (
 	"encoding/json"
+	"fmt"
 
 	"github.com/xyield/xrpl-go/model/client/common"
 )
@@ -39,6 +40,9 @@ func (t *TransactionEntryRequest) UnmarshalJSON(data []byte) error {
 	return nil
 }
 
-func (*TransactionEntryRequest) Validate() error {
+func (t *TransactionEntryRequest) Validate() error {
+	if t.TxHash == "" {
+		return fmt.Errorf("transaction entry request: missing txhash")
+	}
 	return nil
 }
diff --git a/model/client/transactions/tx_request.go b/model/client/transactions/tx_request.go
index 70b2366a..ebc5ffce 100644
--- a/model/client/transactions/tx_request.go
+++ b/model/client/transactions/tx_request.go
@@ -1,6 +1,10 @@
 package transactions
 
-import "github.com/xyield/xrpl-go/model/client/common"
+import (
+	"fmt"
+
+	"github.com/xyield/xrpl-go/model/client/common"
+)
 
 type TxRequest struct {
 	Transaction string             `json:"transaction"`
@@ -13,6 +17,9 @@ func (*TxRequest) Method() string {
 	return "tx"
 }
 
-func (*TxRequest) Validate() error {
+func (t *TxRequest) Validate() error {
+	if t.Transaction == "" {
+		return fmt.Errorf("transaction request: missing transaction")
+	}
 	return nil
 }
diff --git a/model/transactions/types/hash256.go b/model/transactions/types/hash256.go
index df068aa3..e63df929 100644
--- a/model/transactions/types/hash256.go
+++ b/model/transactions/types/hash256.go
@@ -1,3 +1,15 @@
 package types
 
+import "fmt"
+
 type Hash256 string
+
+func (h Hash256) Validate() error {
+	if h == "" {
+		return fmt.Errorf("hash256 value not set")
+	}
+	if len(h) != 64 {
+		return fmt.Errorf("hash256 length was not expected 64 characters")
+	}
+	return nil
+}
diff --git a/model/transactions/types/nftoken_id.go b/model/transactions/types/nftoken_id.go
index 438a0a42..c682b473 100644
--- a/model/transactions/types/nftoken_id.go
+++ b/model/transactions/types/nftoken_id.go
@@ -1,3 +1,13 @@
 package types
 
+import "fmt"
+
 type NFTokenID Hash256
+
+func (id NFTokenID) Validate() error {
+	h := Hash256(id)
+	if err := h.Validate(); err != nil {
+		return fmt.Errorf("nftoken id: %w", err)
+	}
+	return nil
+}