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zkp: add end-to-end Groth-16 proof generation/verification example
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The example shows that the proover knows the solution of the cubic
equation: y = x^3 + x + 5. The example is constructed for BLS12-381
curve points using Groth-16 prooving algorithm. The example includes
everything that developer needs to start using ZKP on the NEO platform
with Go SDK:
1. The described cubic circuit implementation.
2. The off-chain proof generation with the help of gnark-crypto library.
3. Go verification contract generation and deployment with the help of
   NeoGo libraries.
4. The on-chain proof verification for various sets of input data.

Signed-off-by: Anna Shaleva <[email protected]>
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27 changes: 14 additions & 13 deletions examples/README.md
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Expand Up @@ -20,19 +20,20 @@ You can use `my_wallet.json` to deploy example contracts.

See the table below for the detailed examples description.

| Example | Description |
|--------------------------| --- |
| [engine](engine) | This contract demonstrates how to use `runtime` interop package which implements an API for `System.Runtime.*` Neo system calls. Please, refer to the `runtime` [package documentation](../pkg/interop/doc.go) for details. |
| [events](events) | The contract shows how execution notifications with the different arguments types can be sent with the help of `runtime.Notify` function of the `runtime` interop package. Please, refer to the `runtime.Notify` [function documentation](../pkg/interop/runtime/runtime.go) for details. |
| [iterator](iterator) | This example describes a way to work with Neo iterators. Please, refer to the `iterator` [package documentation](../pkg/interop/iterator/iterator.go) for details. |
| [nft-d](nft-d) | NEP-11 divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. |
| [nft-nd](nft-nd) | NEP-11 non-divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. |
| [nft-nd-nns](nft-nd-nns) | Neo Name Service contract which is NEP-11 non-divisible NFT. The contract implements methods for Neo domain name system managing such as domains registration/transferring, records addition and names resolving. The package also contains tests implemented with [neotest](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/neotest). |
| [oracle](oracle) | Oracle demo contract exposing two methods that you can use to process URLs. It uses oracle native contract, see [interop package documentation](../pkg/interop/native/oracle/oracle.go) also. |
| [runtime](runtime) | This contract demonstrates how to use special `_initialize` and `_deploy` methods. See the [compiler documentation](../docs/compiler.md#vm-api-interop-layer ) for methods details. It also shows the pattern for checking owner witness inside the contract with the help of `runtime.CheckWitness` interop [function](../pkg/interop/runtime/runtime.go). |
| [storage](storage) | The contract implements API for basic operations with a contract storage. It shows how to use `storage` interop package. See the `storage` [package documentation](../pkg/interop/storage/storage.go). |
| [timer](timer) | The idea of the contract is to count `tick` method invocations and destroy itself after the third invocation. It shows how to use `contract.Call` interop function to call, update (migrate) and destroy the contract. Please, refer to the `contract.Call` [function documentation](../pkg/interop/contract/contract.go) |
| [token](token) | This contract implements NEP-17 token standard (like NEO and GAS tokens) with all required methods and operations. See the NEP-17 token standard [specification](https://github.com/neo-project/proposals/pull/126) for details. |
| Example | Description |
|----------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [engine](engine) | This contract demonstrates how to use `runtime` interop package which implements an API for `System.Runtime.*` Neo system calls. Please, refer to the `runtime` [package documentation](../pkg/interop/doc.go) for details. |
| [events](events) | The contract shows how execution notifications with the different arguments types can be sent with the help of `runtime.Notify` function of the `runtime` interop package. Please, refer to the `runtime.Notify` [function documentation](../pkg/interop/runtime/runtime.go) for details. |
| [iterator](iterator) | This example describes a way to work with Neo iterators. Please, refer to the `iterator` [package documentation](../pkg/interop/iterator/iterator.go) for details. |
| [nft-d](nft-d) | NEP-11 divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. |
| [nft-nd](nft-nd) | NEP-11 non-divisible NFT. See NEP-11 token standard [specification](https://github.com/neo-project/proposals/blob/master/nep-11.mediawiki) for details. |
| [nft-nd-nns](nft-nd-nns) | Neo Name Service contract which is NEP-11 non-divisible NFT. The contract implements methods for Neo domain name system managing such as domains registration/transferring, records addition and names resolving. The package also contains tests implemented with [neotest](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/neotest). |
| [oracle](oracle) | Oracle demo contract exposing two methods that you can use to process URLs. It uses oracle native contract, see [interop package documentation](../pkg/interop/native/oracle/oracle.go) also. |
| [runtime](runtime) | This contract demonstrates how to use special `_initialize` and `_deploy` methods. See the [compiler documentation](../docs/compiler.md#vm-api-interop-layer ) for methods details. It also shows the pattern for checking owner witness inside the contract with the help of `runtime.CheckWitness` interop [function](../pkg/interop/runtime/runtime.go). |
| [storage](storage) | The contract implements API for basic operations with a contract storage. It shows how to use `storage` interop package. See the `storage` [package documentation](../pkg/interop/storage/storage.go). |
| [timer](timer) | The idea of the contract is to count `tick` method invocations and destroy itself after the third invocation. It shows how to use `contract.Call` interop function to call, update (migrate) and destroy the contract. Please, refer to the `contract.Call` [function documentation](../pkg/interop/contract/contract.go) |
| [token](token) | This contract implements NEP-17 token standard (like NEO and GAS tokens) with all required methods and operations. See the NEP-17 token standard [specification](https://github.com/neo-project/proposals/pull/126) for details. |
| [zkp/cubic_circuit](zkp/cubic_circuit) | This example demonstrates how to create your own circuit and generate Groth-16 proof based on BLS12-381 elliptic curve points with the help of [consensys/gnark](https://pkg.go.dev/github.com/consensys/gnark). It also shows how to generate, deploy and invoke Verifier smart contract to verify proofs for the given circuit on the Neo chain with the help of [zkpbindings](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/smartcontract/zkpbinding) NeoGo package. The package also contains circuit tests implemented with [gnark/test](https://pkg.go.dev/github.com/consensys/gnark/test) to check the circuit validity and end-to-end proof generation/verification test implemented with [neotest](https://pkg.go.dev/github.com/nspcc-dev/neo-go/pkg/neotest) to demonstrate how to build, deploy and verify proofs via Verifier smart contract for the given circuit. |

## Compile

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66 changes: 66 additions & 0 deletions examples/zkp/cubic_circuit/go.mod
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module cubic

go 1.18

require (
github.com/consensys/gnark v0.8.1
github.com/consensys/gnark-crypto v0.9.2
github.com/nspcc-dev/neo-go v0.101.2-0.20230614180905-3e1875218271
github.com/stretchr/testify v1.8.4
)

require (
github.com/benbjohnson/clock v1.1.0 // indirect
github.com/beorn7/perks v1.0.1 // indirect
github.com/blang/semver/v4 v4.0.0 // indirect
github.com/cespare/xxhash/v2 v2.2.0 // indirect
github.com/consensys/bavard v0.1.13 // indirect
github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1 // indirect
github.com/fxamacker/cbor/v2 v2.4.0 // indirect
github.com/golang/protobuf v1.5.3 // indirect
github.com/golang/snappy v0.0.1 // indirect
github.com/google/pprof v0.0.0-20230207041349-798e818bf904 // indirect
github.com/google/uuid v1.3.0 // indirect
github.com/gorilla/websocket v1.4.2 // indirect
github.com/hashicorp/golang-lru v0.6.0 // indirect
github.com/holiman/uint256 v1.2.0 // indirect
github.com/kr/text v0.2.0 // indirect
github.com/mattn/go-colorable v0.1.12 // indirect
github.com/mattn/go-isatty v0.0.14 // indirect
github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
github.com/mmcloughlin/addchain v0.4.0 // indirect
github.com/mr-tron/base58 v1.2.0 // indirect
github.com/nspcc-dev/go-ordered-json v0.0.0-20220111165707-25110be27d22 // indirect
github.com/nspcc-dev/rfc6979 v0.2.0 // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/prometheus/client_golang v1.13.0 // indirect
github.com/prometheus/client_model v0.2.0 // indirect
github.com/prometheus/common v0.37.0 // indirect
github.com/prometheus/procfs v0.8.0 // indirect
github.com/rogpeppe/go-internal v1.11.0 // indirect
github.com/rs/zerolog v1.29.0 // indirect
github.com/russross/blackfriday/v2 v2.0.1 // indirect
github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
github.com/syndtr/goleveldb v1.0.1-0.20210305035536-64b5b1c73954 // indirect
github.com/twmb/murmur3 v1.1.5 // indirect
github.com/urfave/cli v1.22.5 // indirect
github.com/x448/float16 v0.8.4 // indirect
go.etcd.io/bbolt v1.3.7 // indirect
go.uber.org/atomic v1.10.0 // indirect
go.uber.org/multierr v1.9.0 // indirect
go.uber.org/zap v1.24.0 // indirect
golang.org/x/crypto v0.12.0 // indirect
golang.org/x/mod v0.12.0 // indirect
golang.org/x/sync v0.3.0 // indirect
golang.org/x/sys v0.11.0 // indirect
golang.org/x/term v0.11.0 // indirect
golang.org/x/text v0.12.0 // indirect
golang.org/x/tools v0.11.1 // indirect
google.golang.org/protobuf v1.31.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
rsc.io/tmplfunc v0.0.3 // indirect
)

replace github.com/nspcc-dev/neo-go => ../../../
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