ItemSigner
ItemSigner lets a player sign an item in the main hand so it carries a permanent signature with their Minecraft username, and that signature cannot be applied again.
What it does
Signing works like a signed book in vanilla Minecraft. Holding an item in the main hand and using the signing action writes a signature containing the player's username onto that item. Once signed, the item cannot be signed a second time, which makes the signature a fixed record of who first signed it. Only items of the same type are affected, and other items in the inventory remain unchanged.
A companion action signs every matching item stack in the player's inventory at once. The signature appears directly in the item's lore, so it can be read in the tooltip without any extra screen. Coin Stacks are one kind of item that can be signed this way, and the mod is aimed at items that stand in for certificates, contracts, rewards or currencies.
The mod is built for NeoForge 1.21.1 and runs on client and server, so the server and every player need it. It is released under the MIT License and is not open source. The first and latest file, 1.0.0 for 1.21.1, was published on 2026-06-13.
Key features
Signed items
An item in the main hand receives a permanent signature that holds the player's Minecraft username.
Sign all matching stacks
A single action signs every matching item stack in the inventory, so a batch of items is marked at once.
Lore display
The signature is shown in the item's lore, so the tooltip reveals who signed it.
One-time signing
A signed item cannot be signed again, and items of other types stay as they were.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Certificates and contracts
Item stacks can be marked as certificates, contracts or collectibles, with the signer's name recorded on each one.
Reward and currency items
Reward tokens or currency items can carry a signature to show who issued or first claimed them on a server.
Who it’s for: Server owners and players who want a record of who signed a particular item, for trading, rewards or collectible items on a multiplayer server.
How it compares
Seigniorage is a NeoForge 1.21.1 economy mod, client and server, under the MIT License, and it is not open source. W-Coin is also a NeoForge 1.21.1 mod with client and server environment, but it is released under All rights reserved. Coins is open source under the MIT License and runs for Fabric and NeoForge 1.21.8, with a server-required, client-optional environment, so it does not cover signing items.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| ItemSigner | NeoForge | 1.21.1 | Client and server | 2026-06-13 |
| Seigniorage | NeoForge | 1.21.1 | Client and server | 2026-05-31 |
| W-Coin | NeoForge | 1.21.1 | Client and server | 2025-10-07 |
| Coins | Fabric and NeoForge | 1.21.8 | Server required, client optional | 2025-09-14 |
Questions
Does ItemSigner need to be installed on the client?
Can a signed item be signed again?
Which Minecraft version does ItemSigner support?
In the catalog
ItemSigner is one of 2,072 Economy mods on ModsFinder, and one of 917 Economy mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Sign items just like signed books in Minecraft. Create signed collectibles, certificates, contracts, rewards, currencies, and many other unique items with your Minecraft username.
Official listing
- Modrinth page
- modrinth.com/mod/itemsigner
- Owner
- TheEnderHacker
- Published
- 2026-06-13
- Updated on Modrinth
- 2026-06-13
- Facts verified
- 2026-10-15