diff --git a/server/.gitignore b/server/.gitignore
index 7d61c09..7921cd7 100644
--- a/server/.gitignore
+++ b/server/.gitignore
@@ -1,3 +1,6 @@
+# Go files
+ccoin
+
 # Compiled class file
 *.class
 
diff --git a/server/Dockerfile b/server/Dockerfile
new file mode 100644
index 0000000..e69de29
diff --git a/server/database/tables/main.go b/server/database/tables/main.go
new file mode 100644
index 0000000..43f51a6
--- /dev/null
+++ b/server/database/tables/main.go
@@ -0,0 +1,2 @@
+package tables
+
diff --git a/server/docker-compose.yml b/server/docker-compose.yml
new file mode 100644
index 0000000..e69de29
diff --git a/server/go.mod b/server/go.mod
new file mode 100644
index 0000000..6d33007
--- /dev/null
+++ b/server/go.mod
@@ -0,0 +1,3 @@
+module ccoin
+
+go 1.25.5
diff --git a/server/models/api/model.go b/server/models/api/model.go
new file mode 100644
index 0000000..3defce7
--- /dev/null
+++ b/server/models/api/model.go
@@ -0,0 +1,70 @@
+package api
+
+type ApiResponse[T any] struct {
+	Success bool `json:"success"`
+	Data *T `json:"data,omitempty"` // Nullable data
+	Error *string `json:"error,omitempty"` // Nullable error message
+	Timestamp int64 `json:"timestamp"`
+}
+
+type ErrorResponse struct {
+	Error string `json:"error"`
+	Code *string `json:"code,omitempty"`
+	Details map[string]string `json:"details,omitempty"`
+	Timestamp int64 `json:"timestamp"`
+}
+
+type SuccessResponse struct {
+	Message string `json:"message"`
+	Timestamp int64 `json:"timestamp"`
+}
+
+type HealthResponse struct {
+	Status string `json:"status"`
+	Version string `json:"version"`
+	Uptime int64 `json:"uptime"`
+	Database DatabaseHealth `json:"database"`
+	BlockChain BlockChainHealth `json:"blockchain"`
+}
+
+type DatabaseHealth struct {
+	Connected bool `json:"connected"`
+	ResponseTime int64 `json:"response_time"`
+	ActiveConnections int `json:"active_connections"`
+	MaxConnections int `json:"max_connections"`
+}
+
+type BlockChainHealth struct {
+	LatestBlock int `json:"latest_block"`
+	PendingTransactions int `json:"pending_transactions"`
+	NetworkHashRate float64 `json:"network_hash_rate"`
+	AverageBlockTime int64 `json:"average_block_time"`
+}
+
+type PaginationRequest struct {
+	Page int `json:"page"`
+	PageSize int `json:"page_size"`
+	SortBy *string `json:"sort_by,omitempty"`
+	SortOrder SortOrder `json:"sort_order"`
+}
+
+type PaginatedResponse[T any] struct {
+	Data []T `json:"data"`
+	Pagination PaginationInfo `json:"pagination"`
+}
+
+type PaginationInfo struct {
+	CurrentPage int `json:"current_page"`
+	PageSize int `json:"page_size"`
+	TotalItems int `json:"total_items"`
+	TotalPages int `json:"total_pages"`
+	HasNext bool `json:"has_next"`
+	HasPrevious bool `json:"has_previous"`
+}
+
+type SortOrder string
+
+const (
+	ASC SortOrder = "ASC"
+	DESC SortOrder = "DESC"
+)
diff --git a/server/models/block/model.go b/server/models/block/model.go
new file mode 100644
index 0000000..e1c2ab6
--- /dev/null
+++ b/server/models/block/model.go
@@ -0,0 +1,2 @@
+package block
+
diff --git a/server/models/transaction/model.go b/server/models/transaction/model.go
new file mode 100644
index 0000000..d21e18a
--- /dev/null
+++ b/server/models/transaction/model.go
@@ -0,0 +1,39 @@
+package transaction
+
+type SendTransactionRequest struct {
+	FromAddress string `json:"from_address"`
+	ToAddress string `json:"to_address"`
+	Amount float64 `json:"amount"`
+	Fee float64 `json:"fee"`
+	Memo *string `json:"memo,omitempty"`
+	Password string `json:"password"`
+}
+
+type TransactionResponse struct {
+	Hash string `json:"hash"`
+	FromAddress *string `json:"from_address,omitempty"`
+	ToAddress string `json:"to_address"`
+	Amount float64 `json:"amount"`
+	Fee float64 `json:"fee"`
+	Memo *string `json:"memo,omitempty"`
+	BlockHash string `json:"block_hash"`
+	Timestamp int64 `json:"timestamp"`
+	Status string `json:"status"`
+	Confirmations int `json:"confirmations"`
+}
+
+type TransactionHistoryResponse struct {
+	Transactions []TransactionResponse `json:"transactions"`
+	TotalCount int `json:"total_count"`
+	Page int `json:"page"`
+	PageSize int `json:"page_size"`
+}
+
+type TransactionStatus string
+
+const (
+	PENDING TransactionStatus = "PENDING"
+	CONFIRMED TransactionStatus = "CONFIRMED"
+	FAILED TransactionStatus = "FAILED"
+	CANCELLED TransactionStatus = "CANCELLED"
+)
diff --git a/server/models/wallet/model.go b/server/models/wallet/model.go
new file mode 100644
index 0000000..79b3568
--- /dev/null
+++ b/server/models/wallet/model.go
@@ -0,0 +1,24 @@
+package wallet
+
+type CreateWalletRequest struct {
+	Label *string `json:"label,omitempty"`
+	Password string `json:"password"`
+}
+
+type WalletResponse struct {
+	Address string `json:"address"` // Format: "random_word:123456" (e.g. "cave:595462")
+	Balance float64 `json:"balance"`
+	Label *string `json:"label,omitempty"`
+	PasswordHash string `json:"password_hash"`
+	CreatedAt int64 `json:"created_at"`
+	LastActivity *int64 `json:"last_activity,omitempty"`
+}
+
+type BalanceResponse struct {
+	Address string `json:"address"`
+	Balance float64 `json:"balance"`
+}
+
+type UpdateWalletRequest struct {
+	Label *string `json:"label,omitempty"`
+}
diff --git a/server/server.go b/server/server.go
new file mode 100644
index 0000000..344d51f
--- /dev/null
+++ b/server/server.go
@@ -0,0 +1,5 @@
+package main
+
+func main() {
+	println("Hello world")
+}
diff --git a/server/utils/crypto/main.go b/server/utils/crypto/main.go
new file mode 100644
index 0000000..e4f8dd1
--- /dev/null
+++ b/server/utils/crypto/main.go
@@ -0,0 +1,2 @@
+package crypto
+
diff --git a/server/utils/extensions.go b/server/utils/extensions.go
new file mode 100644
index 0000000..9008f48
--- /dev/null
+++ b/server/utils/extensions.go
@@ -0,0 +1,2 @@
+package utils
+
diff --git a/server/utils/hash/main.go b/server/utils/hash/main.go
new file mode 100644
index 0000000..301e290
--- /dev/null
+++ b/server/utils/hash/main.go
@@ -0,0 +1,2 @@
+package hash
+