The legacy format v3 encodes the JSON with base64_urlsafe with the prefix cashuA.
The v4 format uses smaller JSON keys and adds CBOR (converts the JSON to binary) then encodes as base64_urlsafe with the prefix cashuB.
This results in smaller sized tokens.
The prefix was my suggestion to make the difference both human and machine readable, iirc.
CC calle 👁️⚡👁️ (nprofile…h5zr)
For more info:
https://github.com/cashubtc/nuts/blob/main/00.md
SPA
npub1fg…27896
2024-10-04 15:05:45
in reply to nevent1q…6wk6
Author Public Key
npub1fguyv0p2whngcfzpdemjpganhmamp6ngwt26q35jcw0p368jmjkqy27896Published at
2024-10-04 15:05:45Event JSON
{
"id": "6b42ade1718e50ad96f1342fd2cb4f88f242b196d8a82e07376c437fa8b42cb9",
"pubkey": "4a38463c2a75e68c24416e7720a3b3befbb0ea6872d5a04692c39e18e8f2dcac",
"created_at": 1728054345,
"kind": 1,
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"content": "The legacy format v3 encodes the JSON with base64_urlsafe with the prefix cashuA.\n\nThe v4 format uses smaller JSON keys and adds CBOR (converts the JSON to binary) then encodes as base64_urlsafe with the prefix cashuB.\n\nThis results in smaller sized tokens.\n\nThe prefix was my suggestion to make the difference both human and machine readable, iirc.\n\nCC nostr:nprofile1qqs9pk20ctv9srrg9vr354p03v0rrgsqkpggh2u45va77zz4mu5p6ccpz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsz9thwden5te0dehhxarj9ehhsarj9ejx2a30qyg8wumn8ghj7mn0wd68ytnddakj7xph5zr\n\nFor more info:\n\nhttps://github.com/cashubtc/nuts/blob/main/00.md",
"sig": "5c7d406804e2f01ea2b6e620d24f91644bd129a7920e6c76ed534b14547238cb99a39f4a677a882fbb75d53631cb7122cd718852c73450da0e691b7a3bfc1355"
}