# Ledger Nano app for IPFS **URL:** \ **Category:** Ecosystem and Usage\ **Tags:** ipns, dag-jose\ **Created:** [June 24, 2022, 2:44pm UTC](https://discuss.ipfs.tech/t/ledger-nano-app-for-ipfs/14529 "2022-06-24T14:44:25Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![danieln](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ipfs.tech/danieln/32/6408_2.png) [@danieln](https://discuss.ipfs.tech/u/danieln)\ **Post date:** [July 19, 2022, 4:49pm UTC](https://discuss.ipfs.tech/t/ledger-nano-app-for-ipfs/14529/2 "2022-07-19T16:49:00Z")
That’s a cool idea. Beware that the main challenge with IPNS records is that they need to be reprovided to the network because they either expire or the nodes holding them go offline. This means that you would likely want two components: 1. UI to use ledger to sign IPNS records 2. Service/tool to keep on publishing the signed IPNS record. I’ve been actually trying to get a better understanding of how IPNS record expiry works because there are two relevant parameters: `ttl` and `lifetime` but the spec ([https://github.com/ipfs/specs/blob/main/IPNS.md](https://github.com/ipfs/specs/blob/main/IPNS.md)) doesn’t mention lifetime. Some related discussions: > [@Clarification over TTL and LifeTime for IPNS Records](https://discuss.ipfs.tech/t/clarification-over-ttl-and-lifetime-for-ipns-records/4346): > > When using the HTTP API for IPNS publishing, you have the option to set a ttl and lifetime value. Yesterday I was poking around the internals of the IPNS system within go-ipfs and noticed that there is only one concept of “time duration” and that is a TTL. There are functions that can be used to publish records within the namesys system. Here is the interface // Publisher is an object capable of publishing particular names. type Publisher interface { // Publish establishes a name-value mappi… > [@IPNS - how much is the lifetime](https://discuss.ipfs.tech/t/ipns-how-much-is-the-lifetime/6705/2): > > Yes, after 24h, the DHT won’t broadcast the IPNS anymore. You should republish them every 12h or so. This to prevent outdated records to pollute the DHT for a long time. --- _[View the full topic](https://discuss.ipfs.tech/t/ledger-nano-app-for-ipfs/14529)._