feat(chain): go-store dependency and metadata types

Co-Authored-By: Charon <charon@lethean.io>

chain/meta.go

@@ -0,0 +1,30 @@
+// Copyright (c) 2017-2026 Lethean (https://lt.hn)
+//
+// Licensed under the European Union Public Licence (EUPL) version 1.2.
+// SPDX-License-Identifier: EUPL-1.2
+
+package chain
+
+import "forge.lthn.ai/core/go-blockchain/types"
+
+// BlockMeta holds metadata stored alongside each block.
+type BlockMeta struct {
+	Hash           types.Hash `json:"hash"`
+	Height         uint64     `json:"height"`
+	Timestamp      uint64     `json:"timestamp"`
+	Difficulty     uint64     `json:"difficulty"`
+	CumulativeDiff uint64     `json:"cumulative_diff"`
+	GeneratedCoins uint64     `json:"generated_coins"`
+}
+
+// TxMeta holds metadata stored alongside each transaction.
+type TxMeta struct {
+	KeeperBlock         uint64   `json:"keeper_block"`
+	GlobalOutputIndexes []uint64 `json:"global_output_indexes"`
+}
+
+// outputEntry is the value stored in the outputs index.
+type outputEntry struct {
+	TxID  string `json:"tx_id"`
+	OutNo uint32 `json:"out_no"`
+}

go.mod

@@ -4,9 +4,12 @@ go 1.25.5
 
 require (
 	forge.lthn.ai/core/go-p2p v0.0.0-00010101000000-000000000000
+	forge.lthn.ai/core/go-store v0.0.0-00010101000000-000000000000
 	golang.org/x/crypto v0.48.0
 )
 
 require golang.org/x/sys v0.41.0 // indirect
 
 replace forge.lthn.ai/core/go-p2p => /home/claude/Code/core/go-p2p
+
+replace forge.lthn.ai/core/go-store => /home/claude/Code/core/go-store