diff --git a/README.md b/README.md
index 788693c..8193272 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,10 @@
 # go-bbs
+[![Go Report Card](https://goreportcard.com/badge/github.com/suutaku/go-bbs)](https://goreportcard.com/report/github.com/suutaku/go-bbs)
+[![GitHub release](https://img.shields.io/github/release/suutaku/go-bbs?include_prereleases=&sort=semver&color=blue)](https://github.com/suutaku/go-bbs/releases/)
+[![License](https://img.shields.io/badge/License-MIT-blue)](#license)
+[![dependency - github.com/suutaku/bls12381](https://img.shields.io/badge/dependency-github.com%2Fsuutaku%2Fbls12381-blue)](https://pkg.go.dev/github.com/suutaku/bls12381)
  A **BBS++** signature pure go implementation refer to [hyperledger/ursa](https://github.com/hyperledger/ursa.git) (**Rust**) and [heyperledger/aries-framework-go](https://github.com/hyperledger/aries-framework-go.git) (**Without Blind sign**).
+ 
 
 ## Keygen
 
@@ -121,6 +126,10 @@ VerifyProof verifies BBS+ signature proof for one or more revealed messages.
  err := bbsInstance.VerifyProof(messagesBytes, proof, nonce, pubKeyBytes) 
 ```
 
+## License
+
+Released under [MIT](/LICENSE) by [@suutaku](https://github.com/suutaku).
+
 
 
 
diff --git a/go.mod b/go.mod
index 759d9a8..574c237 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,6 @@ module github.com/suutaku/go-bbs
 go 1.18
 
 require (
-	github.com/gtank/merlin v0.1.1
 	github.com/stretchr/testify v1.8.0
 	github.com/suutaku/bls12381 v0.0.0-20220909105542-17195eab9a7d
 	golang.org/x/crypto v0.0.0-20220829220503-c86fa9a7ed90
@@ -11,7 +10,6 @@ require (
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/mimoo/StrobeGo v0.0.0-20181016162300-f8f6d4d2b643 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	golang.org/x/sys v0.0.0-20220908164124-27713097b956 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
diff --git a/go.sum b/go.sum
index 640a57a..c033e78 100644
--- a/go.sum
+++ b/go.sum
@@ -1,10 +1,6 @@
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/gtank/merlin v0.1.1 h1:eQ90iG7K9pOhtereWsmyRJ6RAwcP4tHTDBHXNg+u5is=
-github.com/gtank/merlin v0.1.1/go.mod h1:T86dnYJhcGOh5BjZFCJWTDeTK7XW8uE+E21Cy/bIQ+s=
-github.com/mimoo/StrobeGo v0.0.0-20181016162300-f8f6d4d2b643 h1:hLDRPB66XQT/8+wG9WsDpiCvZf1yKO7sz7scAjSlBa0=
-github.com/mimoo/StrobeGo v0.0.0-20181016162300-f8f6d4d2b643/go.mod h1:43+3pMjjKimDBf5Kr4ZFNGbLql1zKkbImw+fZbw3geM=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=