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CAIP-19: Add block number tag #119

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CAIP-19: Add block number tag #119

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7 changes: 6 additions & 1 deletion CAIPs/caip-19.md
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Original file line number Diff line number Diff line change
Expand Up @@ -31,10 +31,11 @@ The Asset Type is a string designed to uniquely identify the types of assets in
The `asset_type` is a case-sensitive string in the form

```
asset_type: chain_id + "/" + asset_namespace + ":" + asset_reference
asset_type: chain_id + "/" + asset_namespace + ":" + asset_reference + "#" + block_number_tag
chain_id: Blockchain ID Specification cf. CAIP2
asset_namespace: [-a-z0-9]{3,8}
asset_reference: [-a-zA-Z0-9]{1,64}
block_number_tag: [0-9]{1,78}|latest
```

## Specification of Asset ID
Expand Down Expand Up @@ -66,6 +67,7 @@ The goals of the general asset type and asset ID format is:
- To some degree human-readable and helps for basic debugging
- Restricted in a way that it can be stored on-chain
- Character set basic enough to display in hardware wallets as part of a transaction content
- Idempotency and ability to cache the requests to the resource resolvers

The following secondary goals can easily be achieved:

Expand Down Expand Up @@ -111,6 +113,9 @@ eip155:1/erc721:0x06012c8cf97BEaD5deAe237070F9587f8E7A266d

# CryptoKitties Collectible ID
eip155:1/erc721:0x06012c8cf97BEaD5deAe237070F9587f8E7A266d/771769

# CryptoKitties Collectible ID at block number 15051263
eip155:1/erc721:0x06012c8cf97BEaD5deAe237070F9587f8E7A266d/771769#15051263
```

## Copyright
Expand Down