Merge branch 'release/0.2.0'

2020-07-23 21:14:35 +03:00 · 2020-07-23 21:14:35 +03:00 · 751daf328b
commit 751daf328b
parent d97a4a9955 5c2d82a0b6
8 changed files with 646 additions and 1041 deletions
--- a/.gitignore
+++ b/.gitignore
@ -1,2 +1,4 @@
 *.avm
 *.nef
 config.json
 /vendor/
--- a/2
+++ b/2
@ -4,7 +4,7 @@ NEOGO?=neo-go
 .PHONY: build tests
 build:
-	$(NEOGO) contract compile -i neofs_contract.go
+	$(NEOGO) contract compile -i neofs_contract.go -c neofs_config.yml -m config.json
 tests:
 	go mod vendor
--- a/README.md
+++ b/README.md
@ -1,43 +1,31 @@
 # NeoFS smart-contract
-This smart-contract controls list of NeoFS Inner Ring nodes and provides
+This smart-contract controls list of NeoFS Inner Ring nodes, user assets in 
-methods to deposit and withdraw assets. These assets are used as a payment and 
+NeoFS balance contract and stores NeoFS runtime configuration.
 a reward for data storage. 
 ## Getting Started
 This repository contains:
-   NeoFS smart-contract written in Go
+-   NeoFS smart-contract in Go
 -   Unit tests for the smart-contract
 ### Prerequisites
 To compile smart-contract you need:
-   [neo-go](https://github.com/nspcc-dev/neo-go) >= 0.74.0
+-   [neo-go](https://github.com/nspcc-dev/neo-go) >= 0.90.0
 To run tests you need:
 -   [go](https://golang.org/dl/) >= 1.12
 ## Compiling
 To compile smart contract run `make build` command. Compiled contract
-`neofs_contract.avm` will be placed in the same directory.
+`neofs_contract.nef` and manifest `config.json` will be placed in the same 
 directory.
 ```
 $ make build
-neo-go contract compile -i neofs_contract.go                                                                                                                                                                              
+neo-go contract compile -i neofs_contract.go -c neofs_config.yml -m config.json
-02a600c56b6a007bc46a517bc468164e656f2e52756e74696d652e476574547269676765726165880d9e640700006c756668164e656f2e53746f726167652e476574436f6e74657874616a527bc46a00c376064465706c6f798764c7016a52c30d496e6e657252696e674c6973747c657c0d6a537bc46a5
+$ ls neofs_contract.nef config.json 
-3c3c000a0642f0019636f6e747261637420616c7265616479206465706c6f796564680f4e656f2e52756e74696d652e4c6f67f06a51c3c06a547bc46a54c35297009e6448003270726f76696465207061697273206f6620696e6e65722072696e67206164647265737320616e64207075626c6963206b65
+config.json  neofs_contract.nef
 ...
 c46a00c36a59c37c6592fd6476006a52c36a5ac36a59c3ad6469006a58c38b6a587bc4006a5b7bc46a5bc36a57c3c09f6444006a57c36a5bc3c36a59c387642b00156475706c6963617465207075626c6963206b657973680f4e656f2e52756e74696d652e4c6f67f06a5bc38b6a5b7bc462b7ff6a57c36
 a59c3787cc86a577bc46a53c30161936a537bc46234ff6a58c36a56c3a2640700516c75661e6e6f7420656e6f756768207665726966696564207369676e617475726573680f4e656f2e52756e74696d652e4c6f6761006c7566
 $ ls neofs_contract.avm 
 neofs_contract.avm
 ```
 You can specify path to the `neo-go` binary with `NEOGO` environment variable:
@ -46,57 +34,6 @@ You can specify path to the `neo-go` binary with `NEOGO` environment variable:
 $ NEOGO=/home/user/neo-go/bin/neo-go make build
 ```
 ## Running the tests
 `neofs_contract_test.go` file contains tests for most of the provided methods.
 It compiles smart-contract and uses instance of the NeoVM to run 
 code. 
 To test smart contract run `make tests` command.
 ```
 $ make tests 
 go mod vendor
 go test -mod=vendor -v -race github.com/nspcc-dev/neofs-contract
 === RUN   TestContract
    TestContract: neofs_contract_test.go:360: provide pairs of inner ring address and public key
    TestContract: neofs_contract_test.go:360: contract already deployed
 === RUN   TestContract/InnerRingAddress
    TestContract: neofs_contract_test.go:360: target element has been removed
 === RUN   TestContract/Deposit
    TestContract: neofs_contract_test.go:360: funds have been transfered
 === RUN   TestContract/Withdraw
 === RUN   TestContract/Withdraw/Double_Withdraw
    TestContract: neofs_contract_test.go:360: verification check has already been used
 === RUN   TestContract/InnerRingCandidateAdd
 === RUN   TestContract/InnerRingCandidateAdd/Double_InnerRingCandidateAdd
    TestContract: neofs_contract_test.go:360: is already in list
 === RUN   TestContract/InnerRingCandidateRemove
 === RUN   TestContract/InnerRingCandidateRemove/Remove_unknown_candidate
    TestContract: neofs_contract_test.go:360: target element has not been removed
    TestContract: neofs_contract_test.go:360: target element has not been removed
 === RUN   TestContract/InnerRingUpdate
    TestContract/InnerRingUpdate: neofs_contract_test.go:174: implement getIRExcludeCheque without neofs-node dependency
 --- PASS: TestContract (0.43s)
    --- PASS: TestContract/InnerRingAddress (0.00s)
    --- PASS: TestContract/Deposit (0.00s)
    --- PASS: TestContract/Withdraw (0.01s)
        --- PASS: TestContract/Withdraw/Double_Withdraw (0.00s)
    --- PASS: TestContract/InnerRingCandidateAdd (0.00s)
        --- PASS: TestContract/InnerRingCandidateAdd/Double_InnerRingCandidateAdd (0.00s)
    --- PASS: TestContract/InnerRingCandidateRemove (0.00s)
        --- PASS: TestContract/InnerRingCandidateRemove/Remove_unknown_candidate (0.00s)
    --- SKIP: TestContract/InnerRingUpdate (0.00s)
 PASS
 ok      github.com/nspcc-dev/neofs-contract     0.453s
 ```
 ### Skipped tests
 Some tests might be skipped for now. These tests used `neofs-node` 
 structures, that are not publicly available yet, e.g. cheque for 
 `InnerRingUpdate` call.
 ## License
 This project is licensed under the GPLv3 License - see the 
--- a/go.mod
+++ b/go.mod
@ -3,9 +3,12 @@ module github.com/nspcc-dev/neofs-contract
 go 1.12
 require (
-	github.com/multiformats/go-multiaddr v0.2.1
+	github.com/mr-tron/base58 v1.1.3 // indirect
-	github.com/nspcc-dev/neo-go v0.74.0
+	github.com/nspcc-dev/neo-go v0.90.0
 	github.com/nspcc-dev/neofs-api-go v0.5.0
 	github.com/nspcc-dev/neofs-crypto v0.3.0
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/stretchr/testify v1.5.1
 	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 // indirect
 	golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135 // indirect
 	gopkg.in/yaml.v2 v2.2.5 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,10 +1,14 @@
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@ -122,40 +110,31 @@ github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3Rllmb
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 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.27.1 h1:zvIju4sqAGvwKspUQOhwnpcqSbzi7/H6QomNNjTL4sk=
 google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 gopkg.in/abiosoft/ishell.v2 v2.0.0/go.mod h1:sFp+cGtH6o4s1FtpVPTMcHq2yue+c4DGOVohJCPUzwY=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
-gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/neofs_config.yml
+++ b/neofs_config.yml
@ -1,12 +1,2 @@
 ---
 project:
  author: Neo SPCC
  email: ops@nspcc.ru
  version: 0.99
  name: Neofs Smart Contract
 hasstorage: true
-  hasdynamicinvocation: true
+ispayable: false
  ispayable: true
  returntype: ByteArray
  parameters: ['String', 'Array']
--- a/neofs_contract.go
+++ b/neofs_contract.go
@ -1,29 +1,97 @@
 package smart_contract
 /*
 	NeoFS Smart Contract for NEO3.0.
 	Utility operations, executed once in deploy stage:
 	- Init(pubKey, ... )                    - setup initial inner ring nodes
 	- InitConfig(key, value, key, value...) - setup initial NeoFS configuration
 	User operations:
 	- Deposit(script-hash, amount, script-hash(?)) - deposit gas assets to this script-hash address to NeoFS balance
 	- Withdraw(script-hash, amount)                - initialize gas asset withdraw from NeoFS balance
 	- Bind(script-hash, pubKeys...)                - bind public key with user's account to use it in NeoFS requests
 	- Unbind(script-hash, pubKeys...)              - unbind public key from user's account
 	Inner ring list operations:
 	- InnerRingList()                  - returns array of inner ring node keys
 	- InnerRingCandidates()            - returns array of inner ring candidate node keys
 	- IsInnerRing(pubKey)              - returns 'true' if key is inside of inner ring list
 	- InnerRingCandidateAdd(pubKey)    - adds key to the list of inner ring candidates
 	- InnerRingCandidateRemove(pubKey) - removes key from the list of inner ring candidates
 	- InnerRingUpdate(id, pubKeys...)  - updates list of inner ring nodes with provided list of public keys
 	Config operations:
 	- Config(key)               - returns value of NeoFS configuration with key 'key'
 	- ListConfig()              - returns array of all key-value pairs of NeoFS configuration
 	- SetConfig(id, key, value) - set key-value pair as a NeoFS runtime configuration value
 	Other utility operations:
 	- Version                                       - returns contract version
 	- Cheque(id, script- hash, amount, script-hash) - sends gas assets back to the user if they were successfully
 	                                                  locked in NeoFS balance contract
 	Parameters:
 	- (?)    - parameter can be omitted
 	- pubKey - 33 bytes of public key
 	- id     - unique byte sequence
 */
 import (
 	"github.com/nspcc-dev/neo-go/pkg/interop/binary"
 	"github.com/nspcc-dev/neo-go/pkg/interop/blockchain"
 	"github.com/nspcc-dev/neo-go/pkg/interop/contract"
 	"github.com/nspcc-dev/neo-go/pkg/interop/crypto"
 	"github.com/nspcc-dev/neo-go/pkg/interop/engine"
 	"github.com/nspcc-dev/neo-go/pkg/interop/iterator"
 	"github.com/nspcc-dev/neo-go/pkg/interop/runtime"
 	"github.com/nspcc-dev/neo-go/pkg/interop/storage"
 	"github.com/nspcc-dev/neo-go/pkg/interop/util"
 )
-type node struct {
+type (
-	addr []byte
+	ballot struct {
 		id    []byte   // id of the voting decision
 		n     [][]byte // already voted inner ring nodes
 		block int      // block with the last vote
 	}
 	node struct {
 		pub []byte
 	}
-type check struct {
+	cheque struct {
 		id []byte
 	height []byte
 	}
-// GAS NEP-5 HASH
+	record struct {
-const tokenHash = "\x77\xea\x59\x6b\x7a\xdf\x7e\x4d\xd1\x40\x76\x97\x31\xb7\xd2\xf0\xe0\x6b\xcd\x9b"
+		key []byte
 		val []byte
 	}
 )
-const innerRingCandidateFee = 100 * 1000 * 1000 // 10^8
+const (
 	// native gas token script hash
 	tokenHash = "\x3b\x7d\x37\x11\xc6\xf0\xcc\xf9\xb1\xdc\xa9\x03\xd1\xbf\xa1\xd8\x96\xf1\x23\x8c"
-const version = 1
+	defaultCandidateFee   = 100 * 1_0000_0000 // 100 Fixed8 Gas
 	candidateFeeConfigKey = "InnerRingCandidateFee"
 	version = 2
 	innerRingKey     = "innerring"
 	voteKey          = "ballots"
 	candidatesKey    = "candidates"
 	cashedChequesKey = "cheques"
 	blockDiff        = 20 // change base on performance evaluation
 	publicKeySize    = 33
 	minInnerRingSize = 3
 )
 var (
 	configPrefix = []byte("config")
 )
 func Main(op string, args []interface{}) interface{} {
 	// The trigger determines whether this smart-contract is being
@ -32,122 +100,99 @@ func Main(op string, args []interface{}) interface{} {
 		return false
 	}
 	/*
 			Utility operations - they will be changed in production:
 			- Deploy(params: address, pubKey, ... )  - setup initial inner ring state
 			User operations:
 			- InnerRingList()                                - get list of inner ring nodes addresses and public keys
 			- InnerRingAddress(params: address, pubKey)      - update address of the inner ring node with given public key
 			- InnerRingCandidateRemove(params: pubKey)       - remove node with given public key from the inner ring candidate queue
 			- InnerRingCandidateAdd(params: address, pubKey) - add node to the inner ring candidate queue
 			- Deposit(params: pubKey, amount)                - deposit GAS to the NeoFS account
 			- Withdraw(params: withdrawCheque)               - withdraw GAS from the NeoFS account
 			- InnerRingUpdate(params: irCheque)              - change list of inner ring nodes
 			- Version()                                      - get version of the NeoFS smart-contract
 			Params:
 			- address        - string of the valid multiaddress (github.com/multiformats/multiaddr)
 			- pubKey         - 33 byte public key
 		    - withdrawCheque - serialized structure, that confirms GAS transfer;
 							   contains inner ring signatures
 			- irCheque       - serialized structure, that confirms new inner ring node list;
 							   contains inner ring signatures
 	*/
 	ctx := storage.GetContext()
 	switch op {
-	case "Deploy":
+	case "Init":
-		irList := getSerialized(ctx, "InnerRingList").([]node)
+		if storage.Get(ctx, innerRingKey) != nil {
-		if len(irList) >= 3 {
+			panic("neofs: contract already deployed")
 			panic("contract already deployed")
 		}
-		ln := len(args)
+		var irList []node
-		if ln%2 != 0 {
+
-			panic("provide pairs of inner ring address and public key")
+		for i := 0; i < len(args); i++ {
 			pub := args[i].([]byte)
 			irList = append(irList, node{pub: pub})
 		}
-		irList = []node{}
+		// initialize all storage slices
-		for i := 0; i < ln/2; i++ {
+		setSerialized(ctx, innerRingKey, irList)
-			addr := args[i*2].([]byte)
+		setSerialized(ctx, voteKey, []ballot{})
-			pub := args[i*2+1].([]byte)
+		setSerialized(ctx, candidatesKey, []node{})
-			irList = append(irList, node{addr: addr, pub: pub})
+		setSerialized(ctx, cashedChequesKey, []cheque{})
 		}
-		data := runtime.Serialize(irList)
+		runtime.Log("neofs: contract initialized")
 		storage.Put(ctx, "InnerRingList", data)
 		data = runtime.Serialize([]interface{}{})
 		storage.Put(ctx, "UsedVerifCheckList", data)
 		storage.Put(ctx, "InnerRingCandidates", data)
 		return true
 	case "InnerRingList":
-		irList := getSerialized(ctx, "InnerRingList").([]node)
+		return getInnerRingNodes(ctx, innerRingKey)
-
+	case "InnerRingCandidates":
-		return irList
+		return getInnerRingNodes(ctx, candidatesKey)
 	case "InnerRingAddress":
 		addr := args[0].([]byte)
 		pub := args[1].([]byte)
 		irList := getSerialized(ctx, "InnerRingList").([]node)
 		if !containsPub(irList, pub) {
 			panic("inner ring node does not exist")
 		}
 		if runtime.CheckWitness(pub) {
 			n := node{addr: addr, pub: pub}
 			delSerializedIR(ctx, "InnerRingList", pub)
 			putSerialized(ctx, "InnerRingList", n)
 		}
 		return true
 	case "InnerRingCandidateRemove":
-		data := args[0].([]byte) // public key
+		if len(args) != 1 {
-		if !runtime.CheckWitness(data) {
+			panic("irCandidateRemove: bad arguments")
 			panic("you should be the owner of the public key")
 		}
-		delSerializedIR(ctx, "InnerRingCandidates", data)
+		key := args[0].([]byte) // inner ring candidate public key
 		if !runtime.CheckWitness(key) {
 			panic("irCandidateRemove: you should be the owner of the public key")
 		}
 		nodes := []node{} // it is explicit declaration of empty slice, not nil
 		candidates := getInnerRingNodes(ctx, candidatesKey)
 		for i := range candidates {
 			c := candidates[i]
 			if !bytesEqual(c.pub, key) {
 				nodes = append(nodes, c)
 			} else {
 				runtime.Log("irCandidateRemove: candidate has been removed")
 			}
 		}
 		setSerialized(ctx, candidatesKey, nodes)
 		return true
 	case "InnerRingCandidateAdd":
-		addr := args[0].([]byte) // valid multiaddr string
+		if len(args) != 1 {
-		data := args[1].([]byte) // public key
+			panic("irCandidateAdd: bad arguments")
 		if !runtime.CheckWitness(data) {
 			panic("you should be the owner of the public key")
 		}
-		candidates := getSerialized(ctx, "InnerRingCandidates").([]node)
+		key := args[0].([]byte) // inner ring candidate public key
-		if containsPub(candidates, data) {
+		if !runtime.CheckWitness(key) {
-			panic("is already in list")
+			panic("irCandidateAdd: you should be the owner of the public key")
 		}
-		from := pubToScriptHash(data)
+		c := node{pub: key}
-		to := engine.GetExecutingScriptHash()
+		candidates := getInnerRingNodes(ctx, candidatesKey)
-		params := []interface{}{from, to, innerRingCandidateFee}
+
 		list, ok := addNode(candidates, c)
 		if !ok {
 			panic("irCandidateAdd: candidate already in the list")
 		}
 		from := contract.CreateStandardAccount(key)
 		to := runtime.GetExecutingScriptHash()
 		fee := getConfig(ctx, candidateFeeConfigKey).(int)
 		params := []interface{}{from, to, fee}
 		transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
 		if !transferred {
-			panic("failed to transfer funds, aborting")
+			panic("irCandidateAdd: failed to transfer funds, aborting")
 		}
-		candidate := node{
+		runtime.Log("irCandidateAdd: candidate has been added")
-			addr: addr,
+		setSerialized(ctx, candidatesKey, list)
 			pub:  data,
 		}
 		if !putSerialized(ctx, "InnerRingCandidates", candidate) {
 			panic("failed to put candidate into the queue")
 		}
 		return true
 	case "Deposit":
-		pk := args[0].([]byte)
+		if len(args) < 2 || len(args) > 3 {
-		if !runtime.CheckWitness(pk) {
+			panic("deposit: bad arguments")
-			panic("you should be the owner of the public key")
+		}
 		from := args[0].([]byte)
 		if !runtime.CheckWitness(from) {
 			panic("deposit: you should be the owner of the wallet")
 		}
 		amount := args[1].(int)
@ -155,114 +200,290 @@ func Main(op string, args []interface{}) interface{} {
 			amount = amount * 100000000
 		}
-		from := pubToScriptHash(pk)
+		to := runtime.GetExecutingScriptHash()
 		to := engine.GetExecutingScriptHash()
 		params := []interface{}{from, to, amount}
 		transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
 		if !transferred {
-			panic("failed to transfer funds, aborting")
+			panic("deposit: failed to transfer funds, aborting")
 		}
-		runtime.Log("funds have been transferred")
+		runtime.Log("deposit: funds have been transferred")
 		var rcv = from
 		if len(args) == 3 {
 			rcv = args[2].([]byte) // todo: check if rcv value is valid
 		}
 		tx := runtime.GetScriptContainer()
 		runtime.Notify("Deposit", from, amount, rcv, tx.Hash)
 		return true
 	case "Withdraw":
-		from := engine.GetExecutingScriptHash()
+		if len(args) != 2 {
-		data := args[0].([]byte)
+			panic("withdraw: bad arguments")
 		message := data[0:66]
 		uuid := data[0:25]
 		owner := data[25:50]
 		value := data[50:58]
 		height := data[58:66]
 		offset := 68
 		usedList := getSerialized(ctx, "UsedVerifCheckList").([]check)
 		c := check{
 			id:     uuid,
 			height: height,
 		}
 		if containsCheck(usedList, c) {
 			panic("verification check has already been used")
 		}
-		irList := getSerialized(ctx, "InnerRingList").([]node)
+		user := args[0].([]byte)
-		if !verifySignatures(irList, data, message, offset) {
+		if !runtime.CheckWitness(user) {
-			panic("can't verify signatures")
+			panic("withdraw: you should be the owner of the wallet")
 		}
-		h := owner[1:21]
+		amount := args[1].(int)
-		params := []interface{}{from, h, value}
+		if amount > 0 {
 			amount = amount * 100000000
 		}
 		tx := runtime.GetScriptContainer()
 		runtime.Notify("Withdraw", user, amount, tx.Hash)
 		return true
 	case "Cheque":
 		if len(args) != 4 {
 			panic("cheque: bad arguments")
 		}
 		id := args[0].([]byte)      // unique cheque id
 		user := args[1].([]byte)    // GAS receiver
 		amount := args[2].(int)     // amount of GAS
 		lockAcc := args[3].([]byte) // lock account from internal balance contract
 		irList := getInnerRingNodes(ctx, innerRingKey)
 		threshold := len(irList)/3*2 + 1
 		cashedCheques := getCashedCheques(ctx)
 		hashID := crypto.SHA256(id)
 		irKey := innerRingInvoker(irList)
 		if len(irKey) == 0 {
 			panic("cheque: invoked by non inner ring node")
 		}
 		c := cheque{id: id}
 		list, ok := addCheque(cashedCheques, c)
 		if !ok {
 			panic("cheque: non unique id")
 		}
 		n := vote(ctx, hashID, irKey)
 		if n >= threshold {
 			removeVotes(ctx, hashID)
 			from := runtime.GetExecutingScriptHash()
 			params := []interface{}{from, user, amount}
 			transferred := engine.AppCall([]byte(tokenHash), "transfer", params).(bool)
 			if !transferred {
-			panic("failed to transfer funds, aborting")
+				panic("cheque: failed to transfer funds, aborting")
 			}
-		putSerialized(ctx, "UsedVerifCheckList", c)
+			runtime.Log("cheque: funds have been transferred")
 			setSerialized(ctx, cashedChequesKey, list)
 			runtime.Notify("Cheque", id, user, amount, lockAcc)
 		}
 		return true
 	case "Bind", "Unbind":
 		if len(args) < 2 {
 			panic("binding: bad arguments")
 		}
 		user := args[0].([]byte)
 		if !runtime.CheckWitness(user) {
 			panic("binding: you should be the owner of the wallet")
 		}
 		var keys [][]byte
 		for i := 1; i < len(args); i++ {
 			pub := args[i].([]byte)
 			if len(pub) != publicKeySize {
 				panic("binding: incorrect public key size")
 			}
 			keys = append(keys, pub)
 		}
 		runtime.Notify(op, user, keys)
 		return true
 	case "InnerRingUpdate":
-		data := args[0].([]byte)
+		if len(args) < 1+minInnerRingSize {
-
+			// cheque id + inner ring public keys
-		id := data[:8]
+			panic("irUpdate: bad arguments")
 		var ln interface{} = data[8:10]
 		listItemCount := ln.(int)
 		listSize := listItemCount * 33
 		offset := 8 + 2 + listSize
 		msg := data[:offset]
 		message := crypto.SHA256(msg)
 		irList := getSerialized(ctx, "InnerRingList").([]node)
 		if !verifySignatures(irList, data, message, offset) {
 			panic("can't verify signatures")
 		}
-		usedList := getSerialized(ctx, "UsedVerifCheckList").([]check)
+		irList := getInnerRingNodes(ctx, innerRingKey)
-		c := check{
+		threshold := len(irList)/3*2 + 1
-			id:     id,
+
-			height: []byte{1}, // ir update cheques use height as id
+		irKey := innerRingInvoker(irList)
-		}
+		if len(irKey) == 0 {
-		if containsCheck(usedList, c) {
+			panic("innerRingUpdate: invoked by non inner ring node")
 			panic("check has already been used")
 		}
-		candidates := getSerialized(ctx, "InnerRingCandidates").([]node)
+		id := args[0].([]byte)
-		offset = 10
+		c := cheque{id: id}
 		cashedCheques := getCashedCheques(ctx)
 		chequesList, ok := addCheque(cashedCheques, c)
 		if !ok {
 			panic("irUpdate: non unique id")
 		}
 		oldNodes := 0
 		candidates := getInnerRingNodes(ctx, candidatesKey)
 		newIR := []node{}
 	loop:
-		for i := 0; i < listItemCount; i, offset = i+1, offset+33 {
+		for i := 1; i < len(args); i++ {
-			pub := data[offset : offset+33]
+			key := args[i].([]byte)
 			if len(key) != publicKeySize {
 				panic("irUpdate: invalid public key in inner ring list")
 			}
 			// find key in actual inner ring list
 			for j := 0; j < len(irList); j++ {
 				n := irList[j]
-				if util.Equals(n.pub, pub) {
+				if bytesEqual(n.pub, key) {
 					newIR = append(newIR, n)
 					oldNodes++
 					continue loop
 				}
 			}
-			for j := 0; j < len(candidates); j++ {
+			// find key in candidates list
-				n := candidates[j]
+			candidates, newIR, ok = rmNodeByKey(candidates, newIR, key)
-				if util.Equals(n.pub, pub) {
+			if !ok {
-					newIR = append(newIR, n)
+				panic("irUpdate: unknown public key in inner ring list")
 					continue loop
 				}
 			}
 		}
-		if len(newIR) != listItemCount {
+		if oldNodes < len(newIR)*2/3+1 {
-			panic("new inner ring wasn't processed correctly")
+			panic("irUpdate: inner ring change rate must not be more than 1/3 ")
 		}
-		for i := 0; i < len(newIR); i++ {
+		hashID := crypto.SHA256(id)
-			n := newIR[i]
+
-			delSerializedIR(ctx, "InnerRingCandidates", n.pub)
+		n := vote(ctx, hashID, irKey)
 		if n >= threshold {
 			removeVotes(ctx, hashID)
 			setSerialized(ctx, candidatesKey, candidates)
 			setSerialized(ctx, innerRingKey, newIR)
 			setSerialized(ctx, cashedChequesKey, chequesList)
 			runtime.Notify("InnerRingUpdate", c.id, newIR)
 			runtime.Log("irUpdate: inner ring list has been updated")
 		}
-		newIRData := runtime.Serialize(newIR)
+		return true
-		storage.Put(ctx, "InnerRingList", newIRData)
+	case "IsInnerRing":
-		putSerialized(ctx, "UsedVerifCheckList", c)
+		if len(args) != 1 {
 			panic("isInnerRing: wrong arguments")
 		}
 		key := args[0].([]byte)
 		if len(key) != publicKeySize {
 			panic("isInnerRing: incorrect public key")
 		}
 		irList := getInnerRingNodes(ctx, innerRingKey)
 		for i := range irList {
 			node := irList[i]
 			if bytesEqual(node.pub, key) {
 				return true
 			}
 		}
 		return false
 	case "Config":
 		if len(args) != 1 {
 			panic("config: bad arguments")
 		}
 		key := args[0].([]byte)
 		return getConfig(ctx, key)
 	case "SetConfig":
 		if len(args) != 3 {
 			panic("setConfig: bad arguments")
 		}
 		// check if it is inner ring invocation
 		irList := getInnerRingNodes(ctx, innerRingKey)
 		threshold := len(irList)/3*2 + 1
 		irKey := innerRingInvoker(irList)
 		if len(irKey) == 0 {
 			panic("setConfig: invoked by non inner ring node")
 		}
 		// check unique id of the operation
 		id := args[0].([]byte)
 		c := cheque{id: id}
 		cashedCheques := getCashedCheques(ctx)
 		chequesList, ok := addCheque(cashedCheques, c)
 		if !ok {
 			panic("setConfig: non unique id")
 		}
 		// vote for new configuration value
 		hashID := crypto.SHA256(id)
 		n := vote(ctx, hashID, irKey)
 		if n >= threshold {
 			removeVotes(ctx, hashID)
 			key := args[1]
 			val := args[2]
 			setConfig(ctx, key, val)
 			setSerialized(ctx, cashedChequesKey, chequesList)
 			runtime.Notify("SetConfig", id, key, val)
 			runtime.Log("setConfig: configuration has been updated")
 		}
 		return true
 	case "ListConfig":
 		var config []record
 		it := storage.Find(ctx, configPrefix)
 		for iterator.Next(it) {
 			key := iterator.Key(it).([]byte)
 			val := iterator.Value(it).([]byte)
 			r := record{key: key[len(configPrefix):], val: val}
 			config = append(config, r)
 		}
 		return config
 	case "InitConfig":
 		if getConfig(ctx, candidateFeeConfigKey) != nil {
 			panic("neofs: configuration already installed")
 		}
 		ln := len(args)
 		if ln%2 != 0 {
 			panic("initConfig: bad arguments")
 		}
 		setConfig(ctx, candidateFeeConfigKey, defaultCandidateFee)
 		for i := 0; i < ln/2; i++ {
 			key := args[i*2]
 			val := args[i*2+1]
 			setConfig(ctx, key, val)
 		}
 		runtime.Log("neofs: config has been installed")
 		return true
 	case "Version":
@ -272,144 +493,186 @@ func Main(op string, args []interface{}) interface{} {
 	panic("unknown operation")
 }
-func getSerialized(ctx storage.Context, key string) interface{} {
+// innerRingInvoker returns public key of inner ring node that invoked contract.
-	data := storage.Get(ctx, key).([]byte)
+func innerRingInvoker(ir []node) []byte {
-	if len(data) != 0 {
+	for i := 0; i < len(ir); i++ {
-		return runtime.Deserialize(data)
+		node := ir[i]
 		if runtime.CheckWitness(node.pub) {
 			return node.pub
 		}
 	}
 	return nil
 }
-func delSerialized(ctx storage.Context, key string, value []byte) bool {
+// vote adds ballot for the decision with specific 'id' and returns amount
-	data := storage.Get(ctx, key).([]byte)
+// on unique voters for that decision.
-	deleted := false
+func vote(ctx storage.Context, id, from []byte) int {
 	var (
 		newCandidates = []ballot{} // it is explicit declaration of empty slice, not nil
 		candidates    = getBallots(ctx)
 		found         = -1
 		blockHeight   = blockchain.GetHeight()
 	)
-	var newList [][]byte
+	for i := 0; i < len(candidates); i++ {
-	if len(data) != 0 {
+		cnd := candidates[i]
-		lst := runtime.Deserialize(data).([][]byte)
+		if bytesEqual(cnd.id, id) {
-		for i := 0; i < len(lst); i++ {
+			voters := cnd.n
-			if util.Equals(value, lst[i]) {
+
-				deleted = true
+			for j := range voters {
-			} else {
+				if bytesEqual(voters[j], from) {
-				newList = append(newList, lst[i])
+					return len(voters)
 				}
 			}
-		if deleted {
+
-			if len(newList) != 0 {
+			voters = append(voters, from)
-				data := runtime.Serialize(newList)
+			cnd = ballot{id: id, n: voters, block: blockHeight}
 			found = len(voters)
 		}
 		// do not add old ballots, they are invalid
 		if blockHeight-cnd.block <= blockDiff {
 			newCandidates = append(newCandidates, cnd)
 		}
 	}
 	if found < 0 {
 		found = 1
 		voters := [][]byte{from}
 		newCandidates = append(newCandidates, ballot{
 			id:    id,
 			n:     voters,
 			block: blockHeight})
 	}
 	setSerialized(ctx, voteKey, newCandidates)
 	return found
 }
 // removeVotes clears ballots of the decision that has benn aceepted by
 // inner ring nodes.
 func removeVotes(ctx storage.Context, id []byte) {
 	var (
 		newCandidates = []ballot{} // it is explicit declaration of empty slice, not nil
 		candidates    = getBallots(ctx)
 	)
 	for i := 0; i < len(candidates); i++ {
 		cnd := candidates[i]
 		if !bytesEqual(cnd.id, id) {
 			newCandidates = append(newCandidates, cnd)
 		}
 	}
 	setSerialized(ctx, voteKey, newCandidates)
 }
 // setSerialized serializes data and puts it into contract storage.
 func setSerialized(ctx storage.Context, key interface{}, value interface{}) {
 	data := binary.Serialize(value)
 	storage.Put(ctx, key, data)
 }
 // getInnerRingNodes returns deserialized slice of inner ring nodes from storage.
 func getInnerRingNodes(ctx storage.Context, key string) []node {
 	data := storage.Get(ctx, key)
 	if data != nil {
 		return binary.Deserialize(data.([]byte)).([]node)
 	}
 	return []node{}
 }
 // getInnerRingNodes returns deserialized slice of used cheques.
 func getCashedCheques(ctx storage.Context) []cheque {
 	data := storage.Get(ctx, cashedChequesKey)
 	if data != nil {
 		return binary.Deserialize(data.([]byte)).([]cheque)
 	}
 	return []cheque{}
 }
 // getInnerRingNodes returns deserialized slice of vote ballots.
 func getBallots(ctx storage.Context) []ballot {
 	data := storage.Get(ctx, voteKey)
 	if data != nil {
 		return binary.Deserialize(data.([]byte)).([]ballot)
 	}
 	return []ballot{}
 }
 // getConfig returns installed neofs configuration value or nil if it is not set.
 func getConfig(ctx storage.Context, key interface{}) interface{} {
 	postfix := key.([]byte)
 	storageKey := append(configPrefix, postfix...)
 	return storage.Get(ctx, storageKey)
 }
 // setConfig sets neofs configuration value in the contract storage.
 func setConfig(ctx storage.Context, key, val interface{}) {
 	postfix := key.([]byte)
 	storageKey := append(configPrefix, postfix...)
 	storage.Put(ctx, storageKey, val)
 }
 // addCheque returns slice of cheques with appended cheque 'c' and bool flag
 // that set to false if cheque 'c' is already presented in the slice 'lst'.
 func addCheque(lst []cheque, c cheque) ([]cheque, bool) {
 	for i := 0; i < len(lst); i++ {
 		if bytesEqual(c.id, lst[i].id) {
 			return nil, false
 		}
 	}
 	lst = append(lst, c)
 	return lst, true
 }
 // addNode returns slice of nodes with appended node 'n' and bool flag
 // that set to false if node 'n' is already presented in the slice 'lst'.
 func addNode(lst []node, n node) ([]node, bool) {
 	for i := 0; i < len(lst); i++ {
 		if bytesEqual(n.pub, lst[i].pub) {
 			return nil, false
 		}
 	}
 	lst = append(lst, n)
 	return lst, true
 }
 // rmNodeByKey returns slice of nodes without node with key 'k',
 // slices of nodes 'add' with node with key 'k' and bool flag,
 // that set to false if node with a key 'k' does not exists in the slice 'lst'.
 func rmNodeByKey(lst, add []node, k []byte) ([]node, []node, bool) {
 	var (
 		flag   bool
 		newLst = []node{} // it is explicit declaration of empty slice, not nil
 	)
 	for i := 0; i < len(lst); i++ {
 		if bytesEqual(k, lst[i].pub) {
 			add = append(add, lst[i])
 			flag = true
 		} else {
-				storage.Delete(ctx, key)
+			newLst = append(newLst, lst[i])
 			}
 			runtime.Log("target element has been removed")
 			return true
 		}
 	}
 	runtime.Log("target element has not been removed")
 	return false
 }
 func putSerialized(ctx storage.Context, key string, value interface{}) bool {
 	data := storage.Get(ctx, key).([]byte)
 	var lst []interface{}
 	if len(data) != 0 {
 		lst = runtime.Deserialize(data).([]interface{})
 	}
 	lst = append(lst, value)
 	data = runtime.Serialize(lst)
 	storage.Put(ctx, key, data)
 	return true
 }
 func pubToScriptHash(pkey []byte) []byte {
 	pre := []byte{0x21}
 	buf := append(pre, pkey...)
 	buf = append(buf, 0xac)
 	h := crypto.Hash160(buf)
 	return h
 }
 func containsCheck(lst []check, c check) bool {
 	for i := 0; i < len(lst); i++ {
 		if util.Equals(c, lst[i]) {
 			return true
 		}
 	}
 	return false
 }
 func containsPub(lst []node, elem []byte) bool {
 	for i := 0; i < len(lst); i++ {
 		e := lst[i]
 		if util.Equals(elem, e.pub) {
 			return true
 		}
 	}
 	return false
 }
 func delSerializedIR(ctx storage.Context, key string, value []byte) bool {
 	data := storage.Get(ctx, key).([]byte)
 	deleted := false
 	newList := []node{}
 	if len(data) != 0 {
 		lst := runtime.Deserialize(data).([]node)
 		for i := 0; i < len(lst); i++ {
 			n := lst[i]
 			if util.Equals(value, n.pub) {
 				deleted = true
 			} else {
 				newList = append(newList, n)
 			}
 		}
 		if deleted {
 			data := runtime.Serialize(newList)
 			storage.Put(ctx, key, data)
 			runtime.Log("target element has been removed")
 			return true
 		}
 	}
-	runtime.Log("target element has not been removed")
+	return newLst, add, flag
 	return false
 }
 func verifySignatures(irList []node, data []byte, message []byte, offset int) bool {
 	n := len(irList)
 	f := (n - 1) / 3
 	s := n - f
 	if s < 3 {
 		runtime.Log("not enough inner ring nodes for consensus")
 		return false
 }
-	used := [][]byte{}
+// bytesEqual compares two slice of bytes by wrapping them into strings,
-	count := 0
+// which is necessary with new util.Equal interop behaviour, see neo-go#1176.
-	for count < s && offset < len(data) {
+func bytesEqual(a []byte, b []byte) bool {
-		pubkey := data[offset : offset+33]
+	return util.Equals(string(a), string(b))
 		signature := data[offset+33 : offset+97]
 		if containsPub(irList, pubkey) {
 			if crypto.VerifySignature(message, signature, pubkey) {
 				count++
 				for i := 0; i < len(used); i++ {
 					if util.Equals(used[i], pubkey) {
 						panic("duplicate public keys")
 					}
 				}
 				used = append(used, pubkey)
 			}
 		}
 		offset += 97
 	}
 	if count >= s {
 		return true
 	}
 	runtime.Log("not enough verified signatures")
 	return false
 }
--- a/neofs_contract_test.go
+++ b/neofs_contract_test.go
@ -1,534 +0,0 @@
 package smart_contract
 import (
 	"bytes"
 	"crypto/ecdsa"
 	"crypto/elliptic"
 	"crypto/rand"
 	"encoding/hex"
 	"fmt"
 	"math/big"
 	"os"
 	"testing"
 	"github.com/multiformats/go-multiaddr"
 	"github.com/nspcc-dev/neo-go/pkg/compiler"
 	"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
 	"github.com/nspcc-dev/neo-go/pkg/io"
 	"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
 	"github.com/nspcc-dev/neo-go/pkg/util"
 	"github.com/nspcc-dev/neo-go/pkg/vm"
 	"github.com/nspcc-dev/neo-go/pkg/vm/emit"
 	"github.com/nspcc-dev/neofs-api-go/accounting"
 	"github.com/nspcc-dev/neofs-api-go/decimal"
 	"github.com/nspcc-dev/neofs-api-go/refs"
 	crypto "github.com/nspcc-dev/neofs-crypto"
 	"github.com/nspcc-dev/neofs-crypto/test"
 	"github.com/stretchr/testify/require"
 )
 const contractTemplate = "./neofs_contract.go"
 var (
 	contractHash = util.Uint160{0x1, 0x2, 0x3, 0x4}
 	// token hash is not random to run tests of .avm or .go files
 	contractStr = string(contractHash[:])
 )
 type contract struct {
 	script   []byte
 	addrs    []multiaddr.Multiaddr
 	privs    []*ecdsa.PrivateKey
 	cgasHash string
 }
 func TestContract(t *testing.T) {
 	const nodeCount = 6
 	plug := newStoragePlugin(t)
 	contract := initGoContract(t, contractTemplate, nodeCount)
 	plug.cgas[contractStr] = util.Fixed8FromInt64(1000)
 	// fail if odd number of arguments provided
 	v := initVM(contract, plug)
 	loadArg(t, v, "Deploy", []interface{}{contract.addrs[0].String()})
 	require.Error(t, v.Run())
 	// correct arguments
 	var args []interface{}
 	for i := range contract.addrs {
 		args = append(args, contract.addrs[i].String())
 		args = append(args, crypto.MarshalPublicKey(&contract.privs[i].PublicKey))
 	}
 	v = initVM(contract, plug)
 	loadArg(t, v, "Deploy", args)
 	require.NoError(t, v.Run())
 	// double withdraw
 	v = initVM(contract, plug)
 	loadArg(t, v, "Deploy", args)
 	require.Error(t, v.Run())
 	t.Run("InnerRingAddress", func(t *testing.T) {
 		newAddr, err := multiaddr.NewMultiaddr("/dns6/fdb5:7305:0adf:0b0b::/tcp/8080")
 		require.NoError(t, err)
 		previousAddr := contract.addrs[0]
 		key := crypto.MarshalPublicKey(&contract.privs[0].PublicKey)
 		v := initVM(contract, plug)
 		loadArg(t, v, "InnerRingAddress", []interface{}{newAddr.String(), key})
 		require.NoError(t, v.Run())
 		require.False(t, bytes.Contains(plug.mem["InnerRingList"], []byte(previousAddr.String())))
 		require.True(t, bytes.Contains(plug.mem["InnerRingList"], []byte(newAddr.String())))
 		contract.addrs[0] = newAddr
 	})
 	t.Run("Deposit", func(t *testing.T) {
 		v := initVM(contract, plug)
 		before := plug.cgas[contractStr]
 		key := mustHex("031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a")
 		plug.setCGASBalance(key, 4000)
 		loadArg(t, v, "Deposit", []interface{}{key, 1000})
 		require.NoError(t, v.Run())
 		require.Equal(t, before+util.Fixed8FromInt64(1000), plug.cgas[contractStr])
 		require.Equal(t, util.Fixed8FromInt64(3000), plug.cgas[string(mustPKey(key).GetScriptHash().BytesBE())])
 	})
 	t.Run("Withdraw", func(t *testing.T) {
 		const amount = 21
 		v := initVM(contract, plug)
 		owner, cheque := getCheque(t, contract, amount)
 		ownerStr := string(owner[1:21])
 		contractGas := plug.cgas[contractStr]
 		loadArg(t, v, "Withdraw", []interface{}{cheque})
 		require.NoError(t, v.Run())
 		require.Equal(t, contractGas-util.Fixed8FromInt64(amount), plug.cgas[contractStr])
 		require.Equal(t, util.Fixed8FromInt64(amount), plug.cgas[ownerStr])
 		t.Run("Double Withdraw", func(t *testing.T) {
 			v := initVM(contract, plug)
 			loadArg(t, v, "Withdraw", []interface{}{cheque})
 			require.Error(t, v.Run())
 		})
 	})
 	t.Run("InnerRingCandidateAdd", func(t *testing.T) {
 		v := initVM(contract, plug)
 		before := plug.cgas[contractStr]
 		key := crypto.MarshalPublicKey(&test.DecodeKey(1).PublicKey)
 		plug.setCGASBalance(key, 4000)
 		loadArg(t, v, "InnerRingCandidateAdd", []interface{}{"/ip6/2001:4860:4860::8888/tcp/80", key})
 		require.NoError(t, v.Run())
 		fee := util.Fixed8FromInt64(1)
 		require.Equal(t, before+fee, plug.cgas[contractStr])
 		require.Equal(t, util.Fixed8FromInt64(4000)-fee,
 			plug.cgas[string(mustPKey(key).GetScriptHash().BytesBE())])
 		require.True(t, bytes.Contains(plug.mem["InnerRingCandidates"], key))
 		t.Run("Double InnerRingCandidateAdd", func(t *testing.T) {
 			v := initVM(contract, plug)
 			loadArg(t, v, "InnerRingCandidateAdd", []interface{}{"/ip4/8.8.8.8/tcp/80", key})
 			require.Error(t, v.Run())
 		})
 	})
 	t.Run("InnerRingCandidateRemove", func(t *testing.T) {
 		key := crypto.MarshalPublicKey(&test.DecodeKey(2).PublicKey)
 		plug.setCGASBalance(key, 4000)
 		v := initVM(contract, plug)
 		loadArg(t, v, "InnerRingCandidateAdd", []interface{}{"/ip6/2001:4860:4860::8888/tcp/80", key})
 		require.NoError(t, v.Run())
 		require.True(t, bytes.Contains(plug.mem["InnerRingCandidates"], key))
 		t.Run("Remove unknown candidate", func(t *testing.T) {
 			v := initVM(contract, plug)
 			// unknown candidate
 			badKey := crypto.MarshalPublicKey(&test.DecodeKey(3).PublicKey)
 			loadArg(t, v, "InnerRingCandidateRemove", []interface{}{badKey})
 			require.NoError(t, v.Run())
 			require.True(t, bytes.Contains(plug.mem["InnerRingCandidates"], key))
 		})
 		v = initVM(contract, plug)
 		key = mustHex("031a6c6fbbdf02ca351745fa86b9ba5a9452d785ac4f7fc2b7548ca2a46c4fcf4a")
 		loadArg(t, v, "InnerRingCandidateRemove", []interface{}{key})
 		require.NoError(t, v.Run())
 		require.False(t, bytes.Contains(plug.mem["InnerRingCandidates"], key))
 	})
 	t.Run("InnerRingUpdate", func(t *testing.T) {
 		t.Skip("implement getIRExcludeCheque without neofs-node dependency")
 		pubKey := &test.DecodeKey(4).PublicKey
 		key := crypto.MarshalPublicKey(pubKey)
 		plug.setCGASBalance(key, 4000)
 		var pubs []*ecdsa.PublicKey
 		for i := 0; i < len(contract.privs)-1; i++ {
 			pubs = append(pubs, &contract.privs[i].PublicKey)
 		}
 		pubs = append(pubs, pubKey)
 		cheque := getIRExcludeCheque(t, contract, pubs, 777)
 		t.Run("Try without candidate", func(t *testing.T) {
 			v := initVM(contract, plug)
 			loadArg(t, v, "InnerRingUpdate", []interface{}{cheque})
 			require.Error(t, v.Run())
 		})
 		v := initVM(contract, plug)
 		loadArg(t, v, "InnerRingCandidateAdd", []interface{}{"addrX", key})
 		require.NoError(t, v.Run())
 		v = initVM(contract, plug)
 		loadArg(t, v, "InnerRingUpdate", []interface{}{cheque})
 		require.NoError(t, v.Run())
 		for i := 0; i < len(contract.privs)-1; i++ {
 			require.True(t, bytes.Contains(plug.mem["InnerRingList"],
 				crypto.MarshalPublicKey(&contract.privs[i].PublicKey)))
 		}
 		require.True(t, bytes.Contains(plug.mem["InnerRingList"], key))
 		t.Run("Double InnerRingUpdate", func(t *testing.T) {
 			newCheque := getIRExcludeCheque(t, contract, pubs, 777)
 			v = initVM(contract, plug)
 			loadArg(t, v, "InnerRingUpdate", []interface{}{newCheque})
 			require.Error(t, v.Run())
 		})
 	})
 }
 func getCheque(t *testing.T, c *contract, amount int64) (refs.OwnerID, []byte) {
 	id, err := accounting.NewChequeID()
 	require.NoError(t, err)
 	priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 	require.NoError(t, err)
 	owner, err := refs.NewOwnerID(&priv.PublicKey)
 	require.NoError(t, err)
 	cheque := accounting.Cheque{
 		ID:     id,
 		Owner:  owner,
 		Amount: decimal.NewGAS(amount),
 		Height: 0,
 	}
 	for _, key := range c.privs {
 		require.NoError(t, cheque.Sign(key))
 	}
 	data, err := cheque.MarshalBinary()
 	require.NoError(t, err)
 	return owner, data
 }
 func getIRExcludeCheque(t *testing.T, c *contract, pub []*ecdsa.PublicKey, id uint64) []byte {
 	panic("implement without neofs-node dependency")
 }
 func initGoContract(t *testing.T, path string, n int) *contract {
 	f, err := os.Open(path)
 	require.NoError(t, err)
 	defer f.Close()
 	buf, err := compiler.Compile(f)
 	require.NoError(t, err)
 	return &contract{script: buf, privs: getKeys(t, n), addrs: getAddrs(t, n)}
 }
 func getKeys(t *testing.T, n int) []*ecdsa.PrivateKey {
 	privs := make([]*ecdsa.PrivateKey, n)
 	for i := range privs {
 		var err error
 		privs[i], err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
 		require.NoError(t, err)
 	}
 	return privs
 }
 func getAddrs(t *testing.T, n int) []multiaddr.Multiaddr {
 	const template = "/dns4/10.120.14.%d/tcp/8080"
 	addrs := make([]multiaddr.Multiaddr, n)
 	for i := range addrs {
 		var err error
 		addrs[i], err = multiaddr.NewMultiaddr(fmt.Sprintf(template, i))
 		require.NoError(t, err)
 	}
 	return addrs
 }
 func mustHex(s string) []byte {
 	result, err := hex.DecodeString(s)
 	if err != nil {
 		panic(fmt.Errorf("invalid hex: %v", err))
 	}
 	return result
 }
 func initVM(c *contract, plug *storagePlugin) *vm.VM {
 	v := vm.New()
 	v.Load(c.script)
 	v.SetScriptGetter(plug.getScript)
 	v.RegisterInteropGetter(plug.getInterop)
 	return v
 }
 func loadArg(t *testing.T, v *vm.VM, operation string, params []interface{}) {
 	arr := make([]vm.StackItem, len(params))
 	for i := range arr {
 		arr[i] = toStackItem(params[i])
 		require.NotNil(t, arr[i], "invalid stack item")
 	}
 	v.Estack().PushVal(vm.NewArrayItem(arr))
 	v.Estack().PushVal(operation)
 }
 func toStackItem(v interface{}) vm.StackItem {
 	switch val := v.(type) {
 	case int:
 		return vm.NewBigIntegerItem(val)
 	case string:
 		return vm.NewByteArrayItem([]byte(val))
 	case []byte:
 		return vm.NewByteArrayItem(val)
 	default:
 		return nil
 	}
 }
 const cgasSyscall = "MockCGAS"
 type kv struct {
 	Operation string
 	Key       []byte
 	Value     []byte
 }
 type storagePlugin struct {
 	mem        map[string][]byte
 	cgas       map[string]util.Fixed8
 	interops   map[uint32]vm.InteropFunc
 	storageOps []kv
 	notify     []interface{}
 }
 func newStoragePlugin(t *testing.T) *storagePlugin {
 	s := &storagePlugin{
 		mem:      make(map[string][]byte),
 		cgas:     make(map[string]util.Fixed8),
 		interops: make(map[uint32]vm.InteropFunc),
 	}
 	s.interops[getID("Neo.Storage.Delete")] = s.Delete
 	s.interops[getID("Neo.Storage.Get")] = s.Get
 	s.interops[getID("Neo.Storage.GetContext")] = s.GetContext
 	s.interops[getID("Neo.Storage.Put")] = s.Put
 	s.interops[getID("Neo.Runtime.GetExecutingScriptHash")] = s.GetExecutingScriptHash
 	s.interops[getID("Neo.Runtime.GetTrigger")] = s.GetTrigger
 	s.interops[getID("Neo.Runtime.CheckWitness")] = s.CheckWitness
 	s.interops[getID("System.ExecutionEngine.GetExecutingScriptHash")] = s.GetExecutingScriptHash
 	s.interops[getID(cgasSyscall)] = s.CGASInvoke
 	s.interops[getID("Neo.Runtime.Log")] = func(v *vm.VM) error {
 		msg := string(v.Estack().Pop().Bytes())
 		t.Log(msg)
 		return nil
 	}
 	s.interops[getID("Neo.Runtime.Notify")] = func(v *vm.VM) error {
 		val := v.Estack().Pop().Value()
 		s.notify = append(s.notify, toInterface(val))
 		return nil
 	}
 	return s
 }
 func toInterface(val interface{}) interface{} {
 	switch v := val.(type) {
 	case []vm.StackItem:
 		arr := make([]interface{}, len(v))
 		for i, item := range v {
 			arr[i] = toInterface(item)
 		}
 		return arr
 	case vm.StackItem:
 		return toInterface(v.Value())
 	default:
 		return v
 	}
 }
 func getID(name string) uint32 {
 	return vm.InteropNameToID([]byte(name))
 }
 func (s *storagePlugin) getInterop(id uint32) *vm.InteropFuncPrice {
 	f := s.interops[id]
 	if f != nil {
 		return &vm.InteropFuncPrice{Func: f, Price: 1}
 	}
 	switch id {
 	case getID("Neo.Runtime.Serialize"):
 	case getID("Neo.Runtime.Deserialize"):
 	default:
 		panic("unexpected interop")
 	}
 	return nil
 }
 func mustPKey(pub []byte) *keys.PublicKey {
 	var pk keys.PublicKey
 	if err := pk.DecodeBytes(pub); err != nil {
 		panic(err)
 	}
 	return &pk
 }
 func (s *storagePlugin) setCGASBalance(pub []byte, amount int64) {
 	pk := mustPKey(pub)
 	from := string(pk.GetScriptHash().BytesBE())
 	s.cgas[from] = util.Fixed8FromInt64(amount)
 }
 func (s *storagePlugin) CGASInvoke(v *vm.VM) error {
 	op := string(v.Estack().Pop().Bytes())
 	args := v.Estack().Pop().Array()
 	var result bool
 	switch op {
 	case "transfer":
 		from := args[0].Value().([]byte)
 		to := args[1].Value().([]byte)
 		if len(from) != 20 || len(to) != 20 {
 			panic("invalid arguments")
 		}
 		var amount util.Fixed8
 		val := args[2].Value()
 		switch v := val.(type) {
 		case *big.Int:
 			amount = util.Fixed8(v.Int64())
 		case []byte:
 			amount = util.Fixed8(emit.BytesToInt(v).Int64())
 		default:
 			panic("invalid amount")
 		}
 		if s.cgas[string(from)] >= amount {
 			s.cgas[string(from)] -= amount
 			s.cgas[string(to)] += amount
 			result = true
 		}
 	default:
 		panic("invalid operation")
 	}
 	v.Estack().PushVal(result)
 	return nil
 }
 func (s *storagePlugin) getScript(u util.Uint160) ([]byte, bool) {
 	var realHash util.Uint160
 	copy(realHash[:], tokenHash[:])
 	if u.Equals(realHash) {
 		buf := io.NewBufBinWriter()
 		emit.Syscall(buf.BinWriter, cgasSyscall)
 		return buf.Bytes(), false
 	}
 	panic("wrong script hash")
 }
 func (s *storagePlugin) GetTrigger(v *vm.VM) error {
 	// todo: remove byte casting when neo-go issue will be resolved
 	//       https: //github.com/nspcc-dev/neo-go/issues/776
 	v.Estack().PushVal(byte(trigger.Application))
 	return nil
 }
 func (s *storagePlugin) CheckWitness(v *vm.VM) error {
 	v.Estack().PushVal(true)
 	return nil
 }
 func (s *storagePlugin) GetExecutingScriptHash(v *vm.VM) error {
 	var h util.Uint160
 	copy(h[:], contractHash[:])
 	v.Estack().PushVal(h.BytesBE())
 	return nil
 }
 func (s *storagePlugin) logStorage(op string, key, value []byte) {
 	s.storageOps = append(s.storageOps, kv{
 		Operation: op,
 		Key:       key,
 		Value:     value,
 	})
 }
 func (s *storagePlugin) Delete(v *vm.VM) error {
 	v.Estack().Pop()
 	key := v.Estack().Pop().Bytes()
 	s.logStorage("Delete", key, s.mem[string(key)])
 	delete(s.mem, string(key))
 	return nil
 }
 func (s *storagePlugin) Put(v *vm.VM) error {
 	v.Estack().Pop()
 	key := v.Estack().Pop().Bytes()
 	value := v.Estack().Pop().Bytes()
 	s.logStorage("Put", key, value)
 	s.mem[string(key)] = value
 	return nil
 }
 func (s *storagePlugin) Get(v *vm.VM) error {
 	v.Estack().Pop()
 	item := v.Estack().Pop().Bytes()
 	if val, ok := s.mem[string(item)]; ok {
 		v.Estack().PushVal(val)
 		s.logStorage("Get", item, val)
 		return nil
 	}
 	v.Estack().PushVal([]byte{})
 	s.logStorage("Get", item, nil)
 	return nil
 }
 func (s *storagePlugin) GetContext(v *vm.VM) error {
 	// Pushing anything on the stack here will work. This is just to satisfy
 	// the compiler, thinking it has pushed the context ^^.
 	v.Estack().PushVal(10)
 	return nil
 }