contracts/chequebook: add chequebook contract wrapper

The wrapper code is adapted from the swarm/services/chequebook package
with the following mostly cosmetic changes:

* The code now uses the new Go API interfaces to query balances. Some
  minor functional changes were required to make this work.
* The package no longer depends on swarm/services/swap/swap. References
  to swap.Promise are replaced by interface{}, the base type of Promise.
  This is temporary.
* The contract wrapper has been regenerated with latest abigen
  and solc v0.3.6.
* There is a new generator that creates the 'deployed code' variable.
* Documentation comments now follow the recommended godoc style.
* [CHEQUEBOOK] log prefixes are gone.
* LGPL license headers have been added to all files.

3 files changed, 618 insertions, 0 deletions

diff --git a/contracts/chequebook/contract/chequebook.go b/contracts/chequebook/contract/chequebook.go
new file mode 100644
index 000000000..1204f78da
--- /dev/null
+++ b/contracts/chequebook/contract/chequebook.go
@@ -0,0 +1,554 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package contract
+
+import (
+	"math/big"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/accounts/abi"
+	"github.com/ethereum/go-ethereum/accounts/abi/bind"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// ChequebookABI is the input ABI used to generate the binding from.
+const ChequebookABI = `[{"constant":false,"inputs":[],"name":"kill","outputs":[],"type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"sent","outputs":[{"name":"","type":"uint256"}],"type":"function"},{"constant":false,"inputs":[{"name":"beneficiary","type":"address"},{"name":"amount","type":"uint256"},{"name":"sig_v","type":"uint8"},{"name":"sig_r","type":"bytes32"},{"name":"sig_s","type":"bytes32"}],"name":"cash","outputs":[],"type":"function"},{"anonymous":false,"inputs":[{"indexed":false,"name":"deadbeat","type":"address"}],"name":"Overdraft","type":"event"}]`
+
+// ChequebookBin is the compiled bytecode used for deploying new contracts.
+const ChequebookBin = `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`
+
+// DeployChequebook deploys a new Ethereum contract, binding an instance of Chequebook to it.
+func DeployChequebook(auth *bind.TransactOpts, backend bind.ContractBackend) (common.Address, *types.Transaction, *Chequebook, error) {
+	parsed, err := abi.JSON(strings.NewReader(ChequebookABI))
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(ChequebookBin), backend)
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	return address, tx, &Chequebook{ChequebookCaller: ChequebookCaller{contract: contract}, ChequebookTransactor: ChequebookTransactor{contract: contract}}, nil
+}
+
+// Chequebook is an auto generated Go binding around an Ethereum contract.
+type Chequebook struct {
+	ChequebookCaller     // Read-only binding to the contract
+	ChequebookTransactor // Write-only binding to the contract
+}
+
+// ChequebookCaller is an auto generated read-only Go binding around an Ethereum contract.
+type ChequebookCaller struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// ChequebookTransactor is an auto generated write-only Go binding around an Ethereum contract.
+type ChequebookTransactor struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// ChequebookSession is an auto generated Go binding around an Ethereum contract,
+// with pre-set call and transact options.
+type ChequebookSession struct {
+	Contract     *Chequebook       // Generic contract binding to set the session for
+	CallOpts     bind.CallOpts     // Call options to use throughout this session
+	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
+}
+
+// ChequebookCallerSession is an auto generated read-only Go binding around an Ethereum contract,
+// with pre-set call options.
+type ChequebookCallerSession struct {
+	Contract *ChequebookCaller // Generic contract caller binding to set the session for
+	CallOpts bind.CallOpts     // Call options to use throughout this session
+}
+
+// ChequebookTransactorSession is an auto generated write-only Go binding around an Ethereum contract,
+// with pre-set transact options.
+type ChequebookTransactorSession struct {
+	Contract     *ChequebookTransactor // Generic contract transactor binding to set the session for
+	TransactOpts bind.TransactOpts     // Transaction auth options to use throughout this session
+}
+
+// ChequebookRaw is an auto generated low-level Go binding around an Ethereum contract.
+type ChequebookRaw struct {
+	Contract *Chequebook // Generic contract binding to access the raw methods on
+}
+
+// ChequebookCallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract.
+type ChequebookCallerRaw struct {
+	Contract *ChequebookCaller // Generic read-only contract binding to access the raw methods on
+}
+
+// ChequebookTransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract.
+type ChequebookTransactorRaw struct {
+	Contract *ChequebookTransactor // Generic write-only contract binding to access the raw methods on
+}
+
+// NewChequebook creates a new instance of Chequebook, bound to a specific deployed contract.
+func NewChequebook(address common.Address, backend bind.ContractBackend) (*Chequebook, error) {
+	contract, err := bindChequebook(address, backend, backend)
+	if err != nil {
+		return nil, err
+	}
+	return &Chequebook{ChequebookCaller: ChequebookCaller{contract: contract}, ChequebookTransactor: ChequebookTransactor{contract: contract}}, nil
+}
+
+// NewChequebookCaller creates a new read-only instance of Chequebook, bound to a specific deployed contract.
+func NewChequebookCaller(address common.Address, caller bind.ContractCaller) (*ChequebookCaller, error) {
+	contract, err := bindChequebook(address, caller, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &ChequebookCaller{contract: contract}, nil
+}
+
+// NewChequebookTransactor creates a new write-only instance of Chequebook, bound to a specific deployed contract.
+func NewChequebookTransactor(address common.Address, transactor bind.ContractTransactor) (*ChequebookTransactor, error) {
+	contract, err := bindChequebook(address, nil, transactor)
+	if err != nil {
+		return nil, err
+	}
+	return &ChequebookTransactor{contract: contract}, nil
+}
+
+// bindChequebook binds a generic wrapper to an already deployed contract.
+func bindChequebook(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*bind.BoundContract, error) {
+	parsed, err := abi.JSON(strings.NewReader(ChequebookABI))
+	if err != nil {
+		return nil, err
+	}
+	return bind.NewBoundContract(address, parsed, caller, transactor), nil
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_Chequebook *ChequebookRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _Chequebook.Contract.ChequebookCaller.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_Chequebook *ChequebookRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Chequebook.Contract.ChequebookTransactor.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_Chequebook *ChequebookRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _Chequebook.Contract.ChequebookTransactor.contract.Transact(opts, method, params...)
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_Chequebook *ChequebookCallerRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _Chequebook.Contract.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_Chequebook *ChequebookTransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Chequebook.Contract.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_Chequebook *ChequebookTransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _Chequebook.Contract.contract.Transact(opts, method, params...)
+}
+
+// Sent is a free data retrieval call binding the contract method 0x7bf786f8.
+//
+// Solidity: function sent( address) constant returns(uint256)
+func (_Chequebook *ChequebookCaller) Sent(opts *bind.CallOpts, arg0 common.Address) (*big.Int, error) {
+	var (
+		ret0 = new(*big.Int)
+	)
+	out := ret0
+	err := _Chequebook.contract.Call(opts, out, "sent", arg0)
+	return *ret0, err
+}
+
+// Sent is a free data retrieval call binding the contract method 0x7bf786f8.
+//
+// Solidity: function sent( address) constant returns(uint256)
+func (_Chequebook *ChequebookSession) Sent(arg0 common.Address) (*big.Int, error) {
+	return _Chequebook.Contract.Sent(&_Chequebook.CallOpts, arg0)
+}
+
+// Sent is a free data retrieval call binding the contract method 0x7bf786f8.
+//
+// Solidity: function sent( address) constant returns(uint256)
+func (_Chequebook *ChequebookCallerSession) Sent(arg0 common.Address) (*big.Int, error) {
+	return _Chequebook.Contract.Sent(&_Chequebook.CallOpts, arg0)
+}
+
+// Cash is a paid mutator transaction binding the contract method 0xfbf788d6.
+//
+// Solidity: function cash(beneficiary address, amount uint256, sig_v uint8, sig_r bytes32, sig_s bytes32) returns()
+func (_Chequebook *ChequebookTransactor) Cash(opts *bind.TransactOpts, beneficiary common.Address, amount *big.Int, sig_v uint8, sig_r [32]byte, sig_s [32]byte) (*types.Transaction, error) {
+	return _Chequebook.contract.Transact(opts, "cash", beneficiary, amount, sig_v, sig_r, sig_s)
+}
+
+// Cash is a paid mutator transaction binding the contract method 0xfbf788d6.
+//
+// Solidity: function cash(beneficiary address, amount uint256, sig_v uint8, sig_r bytes32, sig_s bytes32) returns()
+func (_Chequebook *ChequebookSession) Cash(beneficiary common.Address, amount *big.Int, sig_v uint8, sig_r [32]byte, sig_s [32]byte) (*types.Transaction, error) {
+	return _Chequebook.Contract.Cash(&_Chequebook.TransactOpts, beneficiary, amount, sig_v, sig_r, sig_s)
+}
+
+// Cash is a paid mutator transaction binding the contract method 0xfbf788d6.
+//
+// Solidity: function cash(beneficiary address, amount uint256, sig_v uint8, sig_r bytes32, sig_s bytes32) returns()
+func (_Chequebook *ChequebookTransactorSession) Cash(beneficiary common.Address, amount *big.Int, sig_v uint8, sig_r [32]byte, sig_s [32]byte) (*types.Transaction, error) {
+	return _Chequebook.Contract.Cash(&_Chequebook.TransactOpts, beneficiary, amount, sig_v, sig_r, sig_s)
+}
+
+// Kill is a paid mutator transaction binding the contract method 0x41c0e1b5.
+//
+// Solidity: function kill() returns()
+func (_Chequebook *ChequebookTransactor) Kill(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Chequebook.contract.Transact(opts, "kill")
+}
+
+// Kill is a paid mutator transaction binding the contract method 0x41c0e1b5.
+//
+// Solidity: function kill() returns()
+func (_Chequebook *ChequebookSession) Kill() (*types.Transaction, error) {
+	return _Chequebook.Contract.Kill(&_Chequebook.TransactOpts)
+}
+
+// Kill is a paid mutator transaction binding the contract method 0x41c0e1b5.
+//
+// Solidity: function kill() returns()
+func (_Chequebook *ChequebookTransactorSession) Kill() (*types.Transaction, error) {
+	return _Chequebook.Contract.Kill(&_Chequebook.TransactOpts)
+}
+
+// MortalABI is the input ABI used to generate the binding from.
+const MortalABI = `[{"constant":false,"inputs":[],"name":"kill","outputs":[],"type":"function"}]`
+
+// MortalBin is the compiled bytecode used for deploying new contracts.
+const MortalBin = `0x606060405260008054600160a060020a03191633179055605c8060226000396000f3606060405260e060020a600035046341c0e1b58114601a575b005b60186000543373ffffffffffffffffffffffffffffffffffffffff90811691161415605a5760005473ffffffffffffffffffffffffffffffffffffffff16ff5b56`
+
+// DeployMortal deploys a new Ethereum contract, binding an instance of Mortal to it.
+func DeployMortal(auth *bind.TransactOpts, backend bind.ContractBackend) (common.Address, *types.Transaction, *Mortal, error) {
+	parsed, err := abi.JSON(strings.NewReader(MortalABI))
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(MortalBin), backend)
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	return address, tx, &Mortal{MortalCaller: MortalCaller{contract: contract}, MortalTransactor: MortalTransactor{contract: contract}}, nil
+}
+
+// Mortal is an auto generated Go binding around an Ethereum contract.
+type Mortal struct {
+	MortalCaller     // Read-only binding to the contract
+	MortalTransactor // Write-only binding to the contract
+}
+
+// MortalCaller is an auto generated read-only Go binding around an Ethereum contract.
+type MortalCaller struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// MortalTransactor is an auto generated write-only Go binding around an Ethereum contract.
+type MortalTransactor struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// MortalSession is an auto generated Go binding around an Ethereum contract,
+// with pre-set call and transact options.
+type MortalSession struct {
+	Contract     *Mortal           // Generic contract binding to set the session for
+	CallOpts     bind.CallOpts     // Call options to use throughout this session
+	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
+}
+
+// MortalCallerSession is an auto generated read-only Go binding around an Ethereum contract,
+// with pre-set call options.
+type MortalCallerSession struct {
+	Contract *MortalCaller // Generic contract caller binding to set the session for
+	CallOpts bind.CallOpts // Call options to use throughout this session
+}
+
+// MortalTransactorSession is an auto generated write-only Go binding around an Ethereum contract,
+// with pre-set transact options.
+type MortalTransactorSession struct {
+	Contract     *MortalTransactor // Generic contract transactor binding to set the session for
+	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
+}
+
+// MortalRaw is an auto generated low-level Go binding around an Ethereum contract.
+type MortalRaw struct {
+	Contract *Mortal // Generic contract binding to access the raw methods on
+}
+
+// MortalCallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract.
+type MortalCallerRaw struct {
+	Contract *MortalCaller // Generic read-only contract binding to access the raw methods on
+}
+
+// MortalTransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract.
+type MortalTransactorRaw struct {
+	Contract *MortalTransactor // Generic write-only contract binding to access the raw methods on
+}
+
+// NewMortal creates a new instance of Mortal, bound to a specific deployed contract.
+func NewMortal(address common.Address, backend bind.ContractBackend) (*Mortal, error) {
+	contract, err := bindMortal(address, backend, backend)
+	if err != nil {
+		return nil, err
+	}
+	return &Mortal{MortalCaller: MortalCaller{contract: contract}, MortalTransactor: MortalTransactor{contract: contract}}, nil
+}
+
+// NewMortalCaller creates a new read-only instance of Mortal, bound to a specific deployed contract.
+func NewMortalCaller(address common.Address, caller bind.ContractCaller) (*MortalCaller, error) {
+	contract, err := bindMortal(address, caller, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &MortalCaller{contract: contract}, nil
+}
+
+// NewMortalTransactor creates a new write-only instance of Mortal, bound to a specific deployed contract.
+func NewMortalTransactor(address common.Address, transactor bind.ContractTransactor) (*MortalTransactor, error) {
+	contract, err := bindMortal(address, nil, transactor)
+	if err != nil {
+		return nil, err
+	}
+	return &MortalTransactor{contract: contract}, nil
+}
+
+// bindMortal binds a generic wrapper to an already deployed contract.
+func bindMortal(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*bind.BoundContract, error) {
+	parsed, err := abi.JSON(strings.NewReader(MortalABI))
+	if err != nil {
+		return nil, err
+	}
+	return bind.NewBoundContract(address, parsed, caller, transactor), nil
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_Mortal *MortalRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _Mortal.Contract.MortalCaller.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_Mortal *MortalRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Mortal.Contract.MortalTransactor.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_Mortal *MortalRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _Mortal.Contract.MortalTransactor.contract.Transact(opts, method, params...)
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_Mortal *MortalCallerRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _Mortal.Contract.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_Mortal *MortalTransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Mortal.Contract.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_Mortal *MortalTransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _Mortal.Contract.contract.Transact(opts, method, params...)
+}
+
+// Kill is a paid mutator transaction binding the contract method 0x41c0e1b5.
+//
+// Solidity: function kill() returns()
+func (_Mortal *MortalTransactor) Kill(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Mortal.contract.Transact(opts, "kill")
+}
+
+// Kill is a paid mutator transaction binding the contract method 0x41c0e1b5.
+//
+// Solidity: function kill() returns()
+func (_Mortal *MortalSession) Kill() (*types.Transaction, error) {
+	return _Mortal.Contract.Kill(&_Mortal.TransactOpts)
+}
+
+// Kill is a paid mutator transaction binding the contract method 0x41c0e1b5.
+//
+// Solidity: function kill() returns()
+func (_Mortal *MortalTransactorSession) Kill() (*types.Transaction, error) {
+	return _Mortal.Contract.Kill(&_Mortal.TransactOpts)
+}
+
+// OwnedABI is the input ABI used to generate the binding from.
+const OwnedABI = `[{"inputs":[],"type":"constructor"}]`
+
+// OwnedBin is the compiled bytecode used for deploying new contracts.
+const OwnedBin = `0x606060405260008054600160a060020a0319163317905560068060226000396000f3606060405200`
+
+// DeployOwned deploys a new Ethereum contract, binding an instance of Owned to it.
+func DeployOwned(auth *bind.TransactOpts, backend bind.ContractBackend) (common.Address, *types.Transaction, *Owned, error) {
+	parsed, err := abi.JSON(strings.NewReader(OwnedABI))
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(OwnedBin), backend)
+	if err != nil {
+		return common.Address{}, nil, nil, err
+	}
+	return address, tx, &Owned{OwnedCaller: OwnedCaller{contract: contract}, OwnedTransactor: OwnedTransactor{contract: contract}}, nil
+}
+
+// Owned is an auto generated Go binding around an Ethereum contract.
+type Owned struct {
+	OwnedCaller     // Read-only binding to the contract
+	OwnedTransactor // Write-only binding to the contract
+}
+
+// OwnedCaller is an auto generated read-only Go binding around an Ethereum contract.
+type OwnedCaller struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// OwnedTransactor is an auto generated write-only Go binding around an Ethereum contract.
+type OwnedTransactor struct {
+	contract *bind.BoundContract // Generic contract wrapper for the low level calls
+}
+
+// OwnedSession is an auto generated Go binding around an Ethereum contract,
+// with pre-set call and transact options.
+type OwnedSession struct {
+	Contract     *Owned            // Generic contract binding to set the session for
+	CallOpts     bind.CallOpts     // Call options to use throughout this session
+	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
+}
+
+// OwnedCallerSession is an auto generated read-only Go binding around an Ethereum contract,
+// with pre-set call options.
+type OwnedCallerSession struct {
+	Contract *OwnedCaller  // Generic contract caller binding to set the session for
+	CallOpts bind.CallOpts // Call options to use throughout this session
+}
+
+// OwnedTransactorSession is an auto generated write-only Go binding around an Ethereum contract,
+// with pre-set transact options.
+type OwnedTransactorSession struct {
+	Contract     *OwnedTransactor  // Generic contract transactor binding to set the session for
+	TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
+}
+
+// OwnedRaw is an auto generated low-level Go binding around an Ethereum contract.
+type OwnedRaw struct {
+	Contract *Owned // Generic contract binding to access the raw methods on
+}
+
+// OwnedCallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract.
+type OwnedCallerRaw struct {
+	Contract *OwnedCaller // Generic read-only contract binding to access the raw methods on
+}
+
+// OwnedTransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract.
+type OwnedTransactorRaw struct {
+	Contract *OwnedTransactor // Generic write-only contract binding to access the raw methods on
+}
+
+// NewOwned creates a new instance of Owned, bound to a specific deployed contract.
+func NewOwned(address common.Address, backend bind.ContractBackend) (*Owned, error) {
+	contract, err := bindOwned(address, backend, backend)
+	if err != nil {
+		return nil, err
+	}
+	return &Owned{OwnedCaller: OwnedCaller{contract: contract}, OwnedTransactor: OwnedTransactor{contract: contract}}, nil
+}
+
+// NewOwnedCaller creates a new read-only instance of Owned, bound to a specific deployed contract.
+func NewOwnedCaller(address common.Address, caller bind.ContractCaller) (*OwnedCaller, error) {
+	contract, err := bindOwned(address, caller, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &OwnedCaller{contract: contract}, nil
+}
+
+// NewOwnedTransactor creates a new write-only instance of Owned, bound to a specific deployed contract.
+func NewOwnedTransactor(address common.Address, transactor bind.ContractTransactor) (*OwnedTransactor, error) {
+	contract, err := bindOwned(address, nil, transactor)
+	if err != nil {
+		return nil, err
+	}
+	return &OwnedTransactor{contract: contract}, nil
+}
+
+// bindOwned binds a generic wrapper to an already deployed contract.
+func bindOwned(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*bind.BoundContract, error) {
+	parsed, err := abi.JSON(strings.NewReader(OwnedABI))
+	if err != nil {
+		return nil, err
+	}
+	return bind.NewBoundContract(address, parsed, caller, transactor), nil
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_Owned *OwnedRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _Owned.Contract.OwnedCaller.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_Owned *OwnedRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Owned.Contract.OwnedTransactor.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_Owned *OwnedRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _Owned.Contract.OwnedTransactor.contract.Transact(opts, method, params...)
+}
+
+// Call invokes the (constant) contract method with params as input values and
+// sets the output to result. The result type might be a single field for simple
+// returns, a slice of interfaces for anonymous returns and a struct for named
+// returns.
+func (_Owned *OwnedCallerRaw) Call(opts *bind.CallOpts, result interface{}, method string, params ...interface{}) error {
+	return _Owned.Contract.contract.Call(opts, result, method, params...)
+}
+
+// Transfer initiates a plain transaction to move funds to the contract, calling
+// its default method if one is available.
+func (_Owned *OwnedTransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
+	return _Owned.Contract.contract.Transfer(opts)
+}
+
+// Transact invokes the (paid) contract method with params as input values.
+func (_Owned *OwnedTransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
+	return _Owned.Contract.contract.Transact(opts, method, params...)
+}
diff --git a/contracts/chequebook/contract/chequebook.sol b/contracts/chequebook/contract/chequebook.sol
new file mode 100644
index 000000000..cb19d0b27
--- /dev/null
+++ b/contracts/chequebook/contract/chequebook.sol
@@ -0,0 +1,43 @@
+import "mortal";
+
+/// @title Chequebook for Ethereum micropayments
+/// @author Daniel A. Nagy <daniel@ethdev.com>
+contract chequebook is mortal {
+    // Cumulative paid amount in wei to each beneficiary
+    mapping (address => uint256) public sent;
+
+    /// @notice Overdraft event
+    event Overdraft(address deadbeat);
+
+    /// @notice Cash cheque
+    ///
+    /// @param beneficiary beneficiary address
+    /// @param amount cumulative amount in wei
+    /// @param sig_v signature parameter v
+    /// @param sig_r signature parameter r
+    /// @param sig_s signature parameter s
+    /// The digital signature is calculated on the concatenated triplet of contract address, beneficiary address and cumulative amount
+    function cash(address beneficiary, uint256 amount,
+        uint8 sig_v, bytes32 sig_r, bytes32 sig_s) {
+        // Check if the cheque is old.
+        // Only cheques that are more recent than the last cashed one are considered.
+        if(amount <= sent[beneficiary]) return;
+        // Check the digital signature of the cheque.
+        bytes32 hash = sha3(address(this), beneficiary, amount);
+        if(owner != ecrecover(hash, sig_v, sig_r, sig_s)) return;
+        // Attempt sending the difference between the cumulative amount on the cheque
+        // and the cumulative amount on the last cashed cheque to beneficiary.
+        if (amount - sent[beneficiary] >= this.balance) {
+            if (beneficiary.send(amount - sent[beneficiary])) {
+                // Upon success, update the cumulative amount.
+                sent[beneficiary] = amount;
+            }
+        } else {
+            // Upon failure, punish owner for writing a bounced cheque.
+            // owner.sendToDebtorsPrison();
+            Overdraft(owner);
+            // Compensate beneficiary.
+            suicide(beneficiary);
+        }
+    }
+}
diff --git a/contracts/chequebook/contract/code.go b/contracts/chequebook/contract/code.go
new file mode 100644
index 000000000..3f11ebfdb
--- /dev/null
+++ b/contracts/chequebook/contract/code.go
@@ -0,0 +1,21 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package contract
+
+// ContractDeployedCode is used to detect suicides. This constant needs to be
+// updated when the contract code is changed.
+const ContractDeployedCode = "0x606060405260e060020a600035046341c0e1b581146100315780637bf786f814610059578063fbf788d614610071575b005b61002f60005433600160a060020a03908116911614156100b957600054600160a060020a0316ff5b6100a760043560016020526000908152604090205481565b61002f600435602435604435606435608435600160a060020a03851660009081526001602052604081205485116100bb576101cf565b60408051918252519081900360200190f35b565b50604080516c0100000000000000000000000030600160a060020a0390811682028352881602601482015260288101869052815190819003604801812080825260ff861660208381019190915282840186905260608301859052925190926001926080818101939182900301816000866161da5a03f11561000257505060405151600054600160a060020a03908116911614610156576101cf565b600160a060020a038681166000908152600160205260409020543090911631908603106101d75760406000818120549151600160a060020a0389169288039082818181858883f19350505050156101cf57846001600050600088600160a060020a03168152602001908152602001600020600050819055505b505050505050565b60005460408051600160a060020a03929092168252517f2250e2993c15843b32621c89447cc589ee7a9f049c026986e545d3c2c0c6f9789181900360200190a185600160a060020a0316ff"