arc26k

ARCs/arc-0026-k.md

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+---
+arc: 26-k
+title: URI scheme, keyreg extension
+description: A specification for encoding Key Registration Transactions in a URI format.
+author: Tasos Bitsios (@tasosbit)
+status: Draft
+type: Standards Track
+category: Interface
+sub-category: General
+created: 2024-10-02
+---
+
+## Abstract
+
+This URI specification represents an extension to the base Algorand URI encoding standard (ARC-26) that specifies encoding of consensus participation key registration transactions through deeplinks, QR codes, etc.
+
+## Specification
+
+### General format
+
+As in ARC-26, URIs follow the general format for URIs as set forth in <a href="https://www.rfc-editor.org/rfc/rfc3986">RFC 3986</a>. The path component consists of an Algorand address, and the query component provides additional transaction parameters.
+
+Elements of the query component may contain characters outside the valid range. These must first be encoded according to UTF-8, and then each octet of the corresponding UTF-8 sequence must be percent-encoded as described in RFC 3986.
+
+### ABNF Grammar
+
+```
+algorandurn     = "algorand://" algorandaddress [ "?" keyregparams ]
+algorandaddress = *base32
+keyregparams    = keyregparam [ "&" keyregparams ]
+keyregparam     = [ typeparam / votekeyparam / selkeyparam / sprfkeyparam / votefstparam / votelstparam / votekdparam / noteparam / feeparam / otherparam ]
+typeparam       = "type=keyref"
+votekeyparam    = "votekey=" *qbase64url
+selkeyparam     = "selkey=" *qbase64url
+sprfkeyparam    = "sprfkey=" *qbase64url
+votefstparam    = "votefst=" *qdigit
+votelstparam    = "votelst=" *qdigit
+votekdparam     = "votekdkey=" *qdigit
+noteparam       = (xnote | note)
+xnote           = "xnote=" *qchar
+note            = "note=" *qchar
+fee             = "fee=" *qdigit
+otherparam      = qchar *qchar [ "=" *qchar ]
+```
+
+- "qbase64url" corresponds to valid characters of "base64url" encoding, as defined in [RFC 4648 section 5](https://www.rfc-editor.org/rfc/rfc4648.html#section-5)
+- "qchar" corresponds to valid characters of an RFC 3986 URI query component, excluding the "=" and "&" characters, which this specification takes as separators.
+
+As in the base ARC-26 standard, the scheme component ("algorand:") is case-insensitive, and implementations must accept any combination of uppercase and lowercase letters. The rest of the URI is case-sensitive, including the query parameter keys.
+
+### Query Keys
+
+- address: Algorand address of transaction sender
+
+- type: fixed to "keyreg". Used to disambiguate the transaction type from the base ARC-26 standard and other possible extensions
+
+- votekeyparam: The vote key parameter to use in the transaction. Encoded with [base64url](https://www.rfc-editor.org/rfc/rfc4648.html#section-5) encoding.
+
+- selkeyparam: The selection key parameter to use in the transaction. Encoded with [base64url](https://www.rfc-editor.org/rfc/rfc4648.html#section-5) encoding.
+
+- sprfkeyparam: The state proof key parameter to use in the transaction. Encoded with [base64url](https://www.rfc-editor.org/rfc/rfc4648.html#section-5) encoding.
+
+- votefstparam: The first round valid parameter to use in the transaction.
+
+- votelstparam: The last round valid parameter to use in the transaction.
+
+- votekdparam: The key dilution key parameter to use in the transaction.
+
+- xnote: As in ARC-26. A URL-encoded notes field value that must not be modifiable by the user when displayed to users.
+
+- note: As in ARC-26. A URL-encoded default notes field value that the the user interface may optionally make editable by the user.
+
+- fee: Optional. A static fee to set for the transaction in microAlgos. Useful to signal intent to receive participation incentives (e.g. with a 2,000,000 microAlgo transaction fee.)
+
+- (others): optional, for future extensions
+
+### Appendix
+
+This section contains encoding examples. The raw transaction object is presented along with the resulting arc26k URI encoding.
+
+#### Encoding with minimum fee 
+
+The following raw keyreg transaction:
+
+```
+{
+  "txn": {
+    "fee": 1000,
+    "fv": 1345,
+    "gh:b64": "kUt08LxeVAAGHnh4JoAoAMM9ql/hBwSoiFtlnKNeOxA=",
+    "lv": 2345,
+    "selkey:b64": "+lfw+Y04lTnllJfncgMjXuAePe8i8YyVeoR9c1Xi78c=",
+    "snd:b64": "+gJAXOr2rkSCdPQ5DEBDLjn+iIptzLxB3oSMJdWMVyQ=",
+    "sprfkey:b64": "3NoXc2sEWlvQZ7XIrwVJjgjM30ndhvwGgcqwKugk1u5W/iy/JITXrykuy0hUvAxbVv0njOgBPtGFsFif3yLJpg==",
+    "type": "keyreg",
+    "votefst": 1300,
+    "votekd": 100,
+    "votekey:b64": "UU8zLMrFVfZPnzbnL6ThAArXFsznV3TvFVAun2ONcEI=",
+    "votelst": 11300
+  }
+}
+```
+
+Will result in this ARC-26-K encoded URI: 
+
+```
+algorand://7IBEAXHK62XEJATU6Q4QYQCDFY475CEKNXGLYQO6QSGCLVMMK4SLVTYLMY?
+type=keyreg
+&selkey=-lfw-Y04lTnllJfncgMjXuAePe8i8YyVeoR9c1Xi78c
+&sprfkey=3NoXc2sEWlvQZ7XIrwVJjgjM30ndhvwGgcqwKugk1u5W_iy_JITXrykuy0hUvAxbVv0njOgBPtGFsFif3yLJpg
+&votefst=1300
+&votekd=100
+&votekey=UU8zLMrFVfZPnzbnL6ThAArXFsznV3TvFVAun2ONcEI
+&votelst=11300
+```
+
+Note: newlines added for readability.
+
+Note the difference between base64 encoding in the raw object and base64url encoding in the URI parameters. For example, the selection key parameter `selkey` that begins with `+lfw+` in the raw object is encoded in base64url to `-lfw-`.
+
+Note: Here, the fee is omitted from the URI (due to being set to the minimum 1,000 microAlgos.) When the fee is omitted, it is left up to the application or wallet to decide. This is for demonstrative purposes - the ARC-26-K standard does not require this behavior.
+
+#### Encoding with custom fee and note
+
+The following raw keyreg transaction:
+
+```
+{
+  "txn": {
+    "fee": 2000000,
+    "fv": 1345,
+    "gh:b64": "kUt08LxeVAAGHnh4JoAoAMM9ql/hBwSoiFtlnKNeOxA=",
+    "lv": 2345,
+    "note:b64": "Q29uc2Vuc3VzIHBhcnRpY2lwYXRpb24gZnR3",
+    "selkey:b64": "+lfw+Y04lTnllJfncgMjXuAePe8i8YyVeoR9c1Xi78c=",
+    "snd:b64": "+gJAXOr2rkSCdPQ5DEBDLjn+iIptzLxB3oSMJdWMVyQ=",
+    "sprfkey:b64": "3NoXc2sEWlvQZ7XIrwVJjgjM30ndhvwGgcqwKugk1u5W/iy/JITXrykuy0hUvAxbVv0njOgBPtGFsFif3yLJpg==",
+    "type": "keyreg",
+    "votefst": 1300,
+    "votekd": 100,
+    "votekey:b64": "UU8zLMrFVfZPnzbnL6ThAArXFsznV3TvFVAun2ONcEI=",
+    "votelst": 11300
+  }
+}
+```
+
+Will result in this ARC-26-K encoded URI: 
+
+```
+algorand://7IBEAXHK62XEJATU6Q4QYQCDFY475CEKNXGLYQO6QSGCLVMMK4SLVTYLMY?
+type=keyreg
+&selkey=-lfw-Y04lTnllJfncgMjXuAePe8i8YyVeoR9c1Xi78c
+&sprfkey=3NoXc2sEWlvQZ7XIrwVJjgjM30ndhvwGgcqwKugk1u5W_iy_JITXrykuy0hUvAxbVv0njOgBPtGFsFif3yLJpg
+&votefst=1300
+&votekd=100
+&votekey=UU8zLMrFVfZPnzbnL6ThAArXFsznV3TvFVAun2ONcEI
+&votelst=11300
+&fee=2000000
+&note=Consensus%2Bparticipation%2Bftw
+```
+
+Note: newlines added for readability.
+
+## Rationale
+
+The present aims to provide a standardized way to encode key registration transactions in order to enhance the user experience of signing key registration transactions in general, and in particular in the use case of an Algorand node runner that does not have their spending keys resident on their node (as is best practice.)
+
+The parameter names were chosen to match the encoded key registration transaction field.
+
+## Security Considerations
+
+None.
+
+## Copyright
+
+Copyright and related rights waived via <a href="https://creativecommons.org/publicdomain/zero/1.0/">CCO</a>.