diff --git a/errors/common.go b/errors/common.go
index 06e12d3ee..3ea5a409e 100644
--- a/errors/common.go
+++ b/errors/common.go
@@ -7,8 +7,13 @@ package errors
 import abci "github.com/tendermint/abci/types"
 
 const (
-	msgDecoding     = "Error decoding input"
-	msgUnauthorized = "Unauthorized"
+	msgDecoding        = "Error decoding input"
+	msgUnauthorized    = "Unauthorized"
+	msgInvalidAddress  = "Invalid Address"
+	msgInvalidCoins    = "Invalid Coins"
+	msgInvalidSequence = "Invalid Sequence"
+	msgNoInputs        = "No Input Coins"
+	msgNoOutputs       = "No Output Coins"
 )
 
 func DecodingError() TMError {
@@ -18,3 +23,23 @@ func DecodingError() TMError {
 func Unauthorized() TMError {
 	return New(msgUnauthorized, abci.CodeType_Unauthorized)
 }
+
+func InvalidAddress() TMError {
+	return New(msgInvalidAddress, abci.CodeType_BaseInvalidInput)
+}
+
+func InvalidCoins() TMError {
+	return New(msgInvalidCoins, abci.CodeType_BaseInvalidInput)
+}
+
+func InvalidSequence() TMError {
+	return New(msgInvalidSequence, abci.CodeType_BaseInvalidInput)
+}
+
+func NoInputs() TMError {
+	return New(msgNoInputs, abci.CodeType_BaseInvalidInput)
+}
+
+func NoOutputs() TMError {
+	return New(msgNoOutputs, abci.CodeType_BaseInvalidOutput)
+}
diff --git a/txs/base.go b/txs/base.go
index 5fe283b25..f67f09db1 100644
--- a/txs/base.go
+++ b/txs/base.go
@@ -11,6 +11,7 @@ const (
 	ByteRaw   = 0x1
 	ByteFees  = 0x2
 	ByteMulti = 0x3
+	ByteChain = 0x4
 
 	// for signatures
 	ByteSig      = 0x16
@@ -22,6 +23,7 @@ const (
 	TypeRaw   = "raw"
 	TypeFees  = "fee"
 	TypeMulti = "multi"
+	TypeChain = "chain"
 
 	// for signatures
 	TypeSig      = "sig"
@@ -32,7 +34,8 @@ func init() {
 	basecoin.TxMapper.
 		RegisterImplementation(Raw{}, TypeRaw, ByteRaw).
 		RegisterImplementation(&Fee{}, TypeFees, ByteFees).
-		RegisterImplementation(&MultiTx{}, TypeMulti, ByteMulti)
+		RegisterImplementation(&MultiTx{}, TypeMulti, ByteMulti).
+		RegisterImplementation(&Chain{}, TypeChain, ByteChain)
 }
 
 // Raw just contains bytes that can be hex-ified
@@ -78,3 +81,19 @@ func NewMultiTx(txs ...basecoin.Tx) *MultiTx {
 func (mt *MultiTx) Wrap() basecoin.Tx {
 	return basecoin.Tx{mt}
 }
+
+/*** Chain ****/
+
+// Chain locks this tx to one chain, wrap with this before signing
+type Chain struct {
+	Tx      basecoin.Tx `json:"tx"`
+	ChainID string      `json:"chain_id"`
+}
+
+func NewChain(tx basecoin.Tx, chainID string) *Chain {
+	return &Chain{Tx: tx, ChainID: chainID}
+}
+
+func (c *Chain) Wrap() basecoin.Tx {
+	return basecoin.Tx{c}
+}
diff --git a/txs/send.go b/txs/send.go
new file mode 100644
index 000000000..cffcd47f1
--- /dev/null
+++ b/txs/send.go
@@ -0,0 +1,119 @@
+package txs
+
+import (
+	"fmt"
+
+	"github.com/tendermint/basecoin"
+	"github.com/tendermint/go-wire/data"
+
+	"github.com/tendermint/basecoin/errors"
+	"github.com/tendermint/basecoin/types"
+)
+
+//-----------------------------------------------------------------------------
+
+type TxInput struct {
+	Address  data.Bytes  `json:"address"`
+	Coins    types.Coins `json:"coins"`
+	Sequence int         `json:"sequence"` // Nonce: Must be 1 greater than the last committed TxInput
+}
+
+func (txIn TxInput) ValidateBasic() error {
+	if len(txIn.Address) != 20 {
+		return errors.InvalidAddress()
+	}
+	if !txIn.Coins.IsValid() {
+		return errors.InvalidCoins()
+	}
+	if txIn.Coins.IsZero() {
+		return errors.InvalidCoins()
+	}
+	if txIn.Sequence <= 0 {
+		return errors.InvalidSequence()
+	}
+	return nil
+}
+
+func (txIn TxInput) String() string {
+	return fmt.Sprintf("TxInput{%v,%v,%v}", txIn.Address, txIn.Coins, txIn.Sequence)
+}
+
+func NewTxInput(addr []byte, coins types.Coins, sequence int) TxInput {
+	input := TxInput{
+		Address:  addr,
+		Coins:    coins,
+		Sequence: sequence,
+	}
+	return input
+}
+
+//-----------------------------------------------------------------------------
+
+type TxOutput struct {
+	Address data.Bytes  `json:"address"`
+	Coins   types.Coins `json:"coins"`
+}
+
+func (txOut TxOutput) ValidateBasic() error {
+	if len(txOut.Address) != 20 {
+		return errors.InvalidAddress()
+	}
+	if !txOut.Coins.IsValid() {
+		return errors.InvalidCoins()
+	}
+	if txOut.Coins.IsZero() {
+		return errors.InvalidCoins()
+	}
+	return nil
+}
+
+func (txOut TxOutput) String() string {
+	return fmt.Sprintf("TxOutput{%X,%v}", txOut.Address, txOut.Coins)
+}
+
+func NewTxOutput(addr []byte, coins types.Coins) TxOutput {
+	output := TxOutput{
+		Address: addr,
+		Coins:   coins,
+	}
+	return output
+}
+
+//-----------------------------------------------------------------------------
+
+type SendTx struct {
+	Inputs  []TxInput  `json:"inputs"`
+	Outputs []TxOutput `json:"outputs"`
+}
+
+var _ basecoin.Tx = SendTx{}.Wrap()
+
+func (tx SendTx) ValidateBasic() error {
+	// this just makes sure all the inputs and outputs are properly formatted,
+	// not that they actually have the money inside
+	if len(tx.Inputs) == 0 {
+		return errors.NoInputs()
+	}
+	if len(tx.Outputs) == 0 {
+		return errors.NoOutputs()
+	}
+	for _, in := range tx.Inputs {
+		if err := in.ValidateBasic(); err != nil {
+			return err
+		}
+	}
+	for _, out := range tx.Outputs {
+		if err := out.ValidateBasic(); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (tx SendTx) String() string {
+	return fmt.Sprintf("SendTx{%v->%v}", tx.Inputs, tx.Outputs)
+}
+
+func (tx SendTx) Wrap() basecoin.Tx {
+	return basecoin.Tx{tx}
+}