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+# Riskline API Access
+
+*Riskline openned it's API for hackathon participants who creates a Winding
+Tree OrgID. To get limited access token you need to proof that you have access
+to an existing OrgID.
+
+Here is an example of communication which needs to be done to get limited free
+access token.
+
+This protocol is also a proof-of-concept of programatic control of access to an
+API for OrgIDs
+
+There is also a code snipped showing how to do sign nonce and verify it using
+javascript and Metamask's web3: https://jsfiddle.net/czervenka/cye5n9m6*
+
+
+**Riskline API base url for token acquisition:** https://api.v2-staging.riskline.com/v2/org-id
+## Actors:
+
+- Owner of Org ID willing to get a token (further just "OrgID")
+- Riskline
+
+
+## Steps:
+
+### 1. Generate Nonce
+
+#### Request:
+
+    POST /nonce
+
+
+#### Response:
+201 Created 
+    {
+        "nonce": "a-unique-string-specific-to-this-challenge-response-series"
+    }
+
+### 2. Sign the nonce
+
+#### Request:
+*OrgId creates message to sign as: `nonce` + `.` + `org_id_address`, signs the
+message using one of OrgID's associatedKeys and sends the response.*
+
+    POST /token
+    content-type: application/json; charset: utf-8
+
+    {
+        "nonce": "a-unique-string-specific-to-this-challenge-response-series",
+        "signature": "0x...",
+        "org_id_address": "0x..."
+    }
+
+#### Response:
+*Riskline*
+
+- *checks whether the nonce was issued by Riskline,*
+- *re-created the signed message (`nonce` + `.` + `org_id_address`),*
+- *extracts signee from `signature` (using ethereum ecRecover function) and*
+- *verifies that the extracted signee is in OrgID.associatedKeys (by calling
+   OrgID.hasAssociatedKey).*
+*If the verification succeeds, it returns OrgID's access token.*
+
+
+    201 Created
+
+    {
+        "token": "secret-token-for-the-org-id-address",
+        "company_key": "key-for-the-org-id"
+    }