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added blockchain transactions and addresses to NIP-73

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Xavier Damman 2025-03-18 23:09:59 +01:00
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@ -13,29 +13,87 @@ There are certain established global content identifiers such as [Book ISBNs](ht
## Supported IDs
| Type | `i` tag | `k` tag |
| --- | --- | --- |
| URLs | "`<URL, normalized, no fragment>`" | "web" |
| Hashtags | "#`<topic, lowercase>`" | "#" |
| Geohashes | "geo:`<geohash, lowercase>`" | "geo" |
| Books | "isbn:`<id, without hyphens>`" | "isbn" |
| Podcast Feeds | "podcast:guid:`<guid>`" | "podcast:guid" |
| Podcast Episodes | "podcast:item:guid:`<guid>`" | "podcast:item:guid" |
| Podcast Publishers | "podcast:publisher:guid:`<guid>`" | "podcast:publisher:guid" |
| Movies | "isan:`<id, without version part>`" | "isan" |
| Papers | "doi:`<id, lowercase>`" | "doi" |
| Type | `i` tag | `k` tag |
| --- | --- | --- |
| Blockchain Transaction | "`<blockchain>`:[`<chainId>`:]tx:`<txid, hex, lowercase>`" | "`<blockchain>`:tx" |
| Blockchain Address | "`<blockchain>`:[`<chainId>`:]address:`<address>`" | "`<blockchain>`:address" |
| Books | "isbn:`<id, without hyphens>`" | "isbn" |
| Geohashes | "geo:`<geohash, lowercase>`" | "geo" |
| Hashtags | "#`<topic, lowercase>`" | "#" |
| Movies | "isan:`<id, without version part>`" | "isan" |
| Papers | "doi:`<id, lowercase>`" | "doi" |
| Podcast Feeds | "podcast:guid:`<guid>`" | "podcast:guid" |
| Podcast Episodes | "podcast:item:guid:`<guid>`" | "podcast:item:guid" |
| Podcast Publishers | "podcast:publisher:guid:`<guid>`" | "podcast:publisher:guid" |
| URLs | "`<URL, normalized, no fragment>`" | "web" |
---
## Examples
### Blockchain
`<blockchain>` can be any level 1 chain (`bitcoin`, `ethereum`, `solana`, ...). If necessary (e.g. for ethereum), you can specify a `<chainId>`.
#### Bitcoin
```
bitcoin:address:<bech32, lowercase | base58, case sensitive>
bitcoin:tx:<txid, hex, lowercase>
```
E.g. https://blockstream.info/tx/a1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d
```jsonc
[
["i", "bitcoin:tx:a1075db55d416d3ca199f55b6084e2115b9345e16c5cf302fc80e9d5fbf5d48d"],
["k", "bitcoin:tx"]
]
```
E.g. https://blockstream.info/address/1HQ3Go3ggs8pFnXuHVHRytPCq5fGG8Hbhx
```jsonc
[
["i", "bitcoin:address:1HQ3Go3ggs8pFnXuHVHRytPCq5fGG8Hbhx"],
["k", "bitcoin:address"]
]
```
#### Ethereum (and other EVM chains)
```
ethereum:<chainId, integer>:tx:<txHash, hex, lowercase>
ethereum:<chainId, integer>:address:<hex, lowercase>
```
E.g. https://etherscan.io/address/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045
```jsonc
[
["i", "ethereum:1:address:0xd8da6bf26964af9d7eed9e03e53415d37aa96045"],
["k", "ethereum:address"]
]
```
E.g. https://gnosisscan.io/tx/0x98f7812be496f97f80e2e98d66358d1fc733cf34176a8356d171ea7fbbe97ccd
```jsonc
[
["i", "ethereum:100:tx:0x98f7812be496f97f80e2e98d66358d1fc733cf34176a8356d171ea7fbbe97ccd"],
["k", "ethereum:tx"]
]
```
### Webpages
For the webpage "https://myblog.example.com/post/2012-03-27/hello-world" the "i" and "k" tags are:
```jsonc
[
["i","https://myblog.example.com/post/2012-03-27/hello-world"],
["i", "https://myblog.example.com/post/2012-03-27/hello-world"],
["k", "web"]
]
```