diff --git a/adapters/projects/dorahacks/signup.go b/adapters/projects/dorahacks/signup.go
new file mode 100644
index 0000000..446d326
--- /dev/null
+++ b/adapters/projects/dorahacks/signup.go
@@ -0,0 +1,88 @@
+package dorahacks
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/taikoxyz/trailblazer-adapters/adapters"
+)
+
+const (
+	// event SignUp(uint256 indexed _stateIdx, PubKey _userPubKey, uint256 _voiceCreditBalance);
+	logSignupSignatureHex string = "0xc7563c66f89e2fb0839e2b64ed54fe4803ff9428777814772ccfe4c385072c4b"
+)
+
+type SignupIndexer struct {
+	client    *ethclient.Client
+	addresses []common.Address
+}
+
+func NewSignupIndexer(client *ethclient.Client, addresses []common.Address) *SignupIndexer {
+	return &SignupIndexer{
+		client:    client,
+		addresses: addresses,
+	}
+}
+
+var _ adapters.LogIndexer[adapters.Whitelist] = &SignupIndexer{}
+
+func (indexer *SignupIndexer) Addresses() []common.Address {
+	return indexer.addresses
+}
+
+func (indexer *SignupIndexer) Index(ctx context.Context, logs ...types.Log) ([]adapters.Whitelist, error) {
+	var ws []adapters.Whitelist
+
+	for _, l := range logs {
+		if !indexer.isSignup(l) {
+			continue
+		}
+
+		block, err := indexer.client.BlockByNumber(ctx, big.NewInt(int64(l.BlockNumber)))
+		if err != nil {
+			return nil, err
+		}
+
+		txHash := l.TxHash
+		receipt, err := indexer.client.TransactionReceipt(ctx, txHash)
+		if err != nil {
+			return nil, err
+		}
+		if receipt.Status == 0 {
+			// tx failed, continue
+			continue
+		}
+
+		tx, pending, err := indexer.client.TransactionByHash(ctx, txHash)
+		if err != nil {
+			return nil, err
+		}
+		if pending {
+			// tx pending, continue
+			continue
+		}
+
+		sender, err := indexer.client.TransactionSender(ctx, tx, block.Hash(), receipt.TransactionIndex)
+		if err != nil {
+			return nil, err
+		}
+
+		w := &adapters.Whitelist{
+			User:        sender, // msg.sender equals signup for DoraHacks MACI
+			Time:        block.Time(),
+			BlockNumber: block.NumberU64(),
+			TxHash:      txHash,
+		}
+
+		ws = append(ws, *w)
+	}
+
+	return ws, nil
+}
+
+func (indexer *SignupIndexer) isSignup(l types.Log) bool {
+	return l.Topics[0].Hex() == logSignupSignatureHex
+}
diff --git a/adapters/projects/dorahacks/signup_test.go b/adapters/projects/dorahacks/signup_test.go
new file mode 100644
index 0000000..cfcaab2
--- /dev/null
+++ b/adapters/projects/dorahacks/signup_test.go
@@ -0,0 +1,36 @@
+package dorahacks_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/ethclient"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"github.com/taikoxyz/trailblazer-adapters/adapters"
+	"github.com/taikoxyz/trailblazer-adapters/adapters/projects/dorahacks"
+)
+
+func TestSignupIndexer(t *testing.T) {
+	taikoRPC := "https://rpc.taiko.xyz"
+	blocknumber := int64(861132)
+
+	ctx := context.Background()
+
+	client, err := ethclient.Dial(taikoRPC)
+	require.NoError(t, err)
+
+	indexer := dorahacks.NewSignupIndexer(client, []common.Address{common.HexToAddress(dorahacks.VotingAddress)})
+
+	logs, err := adapters.GetLogs(ctx, client, indexer.Addresses(), blocknumber)
+	require.NoError(t, err)
+
+	ws, err := indexer.Index(ctx, logs...)
+	assert.NoError(t, err)
+	assert.Len(t, ws, 1)
+	assert.Equal(t, common.HexToAddress("0xA9d1f06b6AF87B312aBbb523A5e41995F199930b"), ws[0].User)
+	assert.Equal(t, uint64(861132), ws[0].BlockNumber)
+	assert.Equal(t, uint64(1739528687), ws[0].Time)
+	assert.Equal(t, common.HexToHash("0x04f0a71af85058eeedd078cb2a21e18c82dbf93d814dcf0e051ad6c891116b60"), ws[0].TxHash)
+}