Add caip2 for Algorand

algorand/README.md

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+---
+namespace-identifier: algorand
+title: Algorand Namespace
+author: Jason Paulos (@jasonpaulos)
+status: Draft
+type: Informational
+created: 2023-01-11
+requires: ["CAIP-2"]
+---
+
+# Namespace for Algorand Blockchains
+
+This document defines the applicability of CAIP schemes to the blockchains of
+the Algorand ecosystem.
+
+## Syntax
+
+The namespace "algorand" refers to the Algorand open-source blockchain platform.
+
+## References
+
+- [Algorand Specifications](https://github.com/algorandfoundation/specs)
+- [Algorand Developer Portal](https://developer.algorand.org)
+- [CAIP-2](https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-2.md)
+- [CAIP-10](https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-10.md)
+- [CAIP-122](https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-122.md) 
+
+## Rights
+
+Copyright and related rights waived via CC0.

algorand/caip2.md

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+---
+namespace-identifier: algorand-caip2
+title: Algorand Namespace - Chains
+author: Jason Paulos (@jasonpaulos)
+status: Draft
+type: Standard
+created: 2023-01-11
+requires: CAIP-2
+---
+
+# CAIP-2
+
+*For context, see the [CAIP-2][] specification.*
+
+## Abstract
+
+In CAIP-2 a general blockchain identification scheme is defined. This is the
+implementation of CAIP-2 for Algorand network.
+
+### Algorand Namespace
+
+The namespace "algorand" refers to the wider Algorand ecosystem.
+
+## Rationale
+
+Algorand consists of multiple networks: a production network (MainNet), a
+testing network (TestNet), a network where new features are trialed (BetaNet),
+and many more, including private networks used for development. Each network has
+a unique genesis hash that can be used to identify it.
+
+An identifier for an Algorand chain consists of the namespace prefix "algorand:"
+followed by a truncated form of the chain's genesis hash.
+
+## Syntax
+
+Due to length and character limitations of CAIP-2 reference identifiers
+(references must adhere to `[-_a-zA-Z0-9]{1,32}`), the commonly referenced
+standard base64-encoded genesis hash of an Algorand chain cannot be used
+directly as a reference.
+
+Instead, two changes must be made:
+1. The genesis hash must be encoded with a URL-safe base64 alphabet (i.e. the
+   characters `+` and `/` must be replaced with `-` and `_`, respectively).
+2. Only the first 32 characters of the URL-safe base64-encoding will be used.
+
+### Resolution Method
+
+To resolve the blockchain reference for an Algorand chain, a GET request can be
+made to an Algorand node on the path `/v2/transactions/params`. This will return
+a JSON object with the the key `genesis-hash`, whose value is the base64-encoded
+genesis hash of the current chain.
+
+For example:
+
+```jsonc
+// Request
+curl -H "X-Algo-API-Token:${YOUR_AUTH_TOKEN}" "https://example.algorand.node/v2/transactions/params"
+
+// Response (formatted)
+{
+  "consensus-version": "https://github.com/algorandfoundation/specs/tree/44fa607d6051730f5264526bf3c108d51f0eadb6",
+  "fee": 0,
+  "genesis-hash": "mFgazF+2uRS1tMiL9dsj01hJGySEmPN28B/TjjvpVW0=",
+  "genesis-id": "betanet-v1.0",
+  "last-round": 23473050,
+  "min-fee": 1000
+}
+```
+
+Note that the `genesis-hash` value returned must be re-encoded with the URL-safe
+base64 alphabet, and it will be substringed to the first 32 characters.
+
+For example, this Node.js code transforms the above response into a CAIP-2 identifier:
+
+```javascript
+const genesisHash = "mFgazF+2uRS1tMiL9dsj01hJGySEmPN28B/TjjvpVW0=";
+const urlSafe = Buffer.from(genesisHash, "base64").toString("base64url");
+const prefix = urlSafe.substring(0, 32);
+const identifier = "algorand:" + prefix;
+
+console.log(identifier); // prints "algorand:mFgazF-2uRS1tMiL9dsj01hJGySEmPN2"
+```
+
+## Backwards Compatibility
+
+Not applicable.
+
+## Test Cases
+
+```
+# Algorand MainNet has the genesis hash wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=
+algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73k
+
+# Algorand TestNet has the genesis hash SGO1GKSzyE7IEPItTxCByw9x8FmnrCDexi9/cOUJOiI=
+algorand:SGO1GKSzyE7IEPItTxCByw9x8FmnrCDe
+
+# Algorand BetaNet has the genesis hash mFgazF+2uRS1tMiL9dsj01hJGySEmPN28B/TjjvpVW0=
+algorand:mFgazF-2uRS1tMiL9dsj01hJGySEmPN2
+```
+
+## References
+
+- [Algorand Networks](https://developer.algorand.org/docs/get-details/algorand-networks/)
+- [Algorand REST API](https://developer.algorand.org/docs/rest-apis/algod/v2/)
+- [CAIP-2](https://github.com/ChainAgnostic/CAIPs/blob/master/CAIPs/caip-2.md)
+
+## Rights
+
+Copyright and related rights waived via CC0.