Nostr does this quite well as a public relay service.

Tim Bouma
npub1q6mcr8tlr3l4gus3sfnw6772s7zae6hqncmw5wj27ejud5wcxf7q0nx7d5
hex
0cc8ad92e27511f2bb00c36ee0af4ce6582649f464ad4d47934edbe57ef59cebnevent
nevent1qqsqej9djt382y0jhvqvxmhq4axwvkpxf86xft2dg7f5akl90m6ee6cprpmhxue69uhhyetvv9ujuem4d36kwatvw5hx6mm9qgsqddupn4l3cl65wggcyehd009g0pwuatsfudh28f90vewx68vrylqrh4x2aKind-1 (TextNote)
↳ Reply to d1a61498... (npub16xnpfx85k8wzdhctang6860g3u64lds5kac73ddjwlg0lxdg9g3su56z6l)
Inkan uses Ethereum to record declarations of delegation / revocation of signing authority. That's how Inkan makes it possible to revoke and replace c...
Nostr does this quite well as a public relay service.
Raw JSON
{
"kind": 1,
"id": "0cc8ad92e27511f2bb00c36ee0af4ce6582649f464ad4d47934edbe57ef59ceb",
"pubkey": "06b7819d7f1c7f5472118266ed7bca8785dceae09e36ea3a4af665c6d1d8327c",
"created_at": 1773669929,
"tags": [
[
"e",
"de37b818aa3a65b544c60e43169f3019901ab0ed454ad13a438004cad0da53bc",
"wss://relay.getsafebox.app/",
"root",
"06b7819d7f1c7f5472118266ed7bca8785dceae09e36ea3a4af665c6d1d8327c"
],
[
"e",
"b2dd72f60fc6da458751105d8aa6a7319d5a571b19f0603f35d0df353423bdea",
"wss://atlas.nostr.land/invoices",
"reply",
"d1a61498f4b1dc26df0becd1a3e9e88f355fb614b771e8b5b277d0ff99a82a23"
],
[
"p",
"d1a61498f4b1dc26df0becd1a3e9e88f355fb614b771e8b5b277d0ff99a82a23"
]
],
"content": "Nostr does this quite well as a public relay service.",
"sig": "4ecff95dd68c7e7b0aa69d40f5ce0a0501e200fa08d115896bf3f602d6c36d4d28b0f5933632b145b9b8d73098cb8525787d5f6ca025e91991c9967d136e1f1c"
}