Create bsip-0037.md

bsip-0037.md

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+    BSIP: 0037
+    Title: Extend created asset names
+    Author: oxarbitrage <https://github.com/oxarbitrage>
+    Status: Draft
+    Type: Protocol
+    Created: 2018-02-23
+    Discussion: https://github.com/bitshares/bitshares-core/issues/620
+    Replaces: -
+    Worker: To be done
+
+# Abstract
+
+Currently, the bitshares-core do not allow asset creation that start or end with a numerical character. Creation of index style assets like `CRYPTO500` are not possible.
+
+This BSIP proposes a protocol change to allow number characters at the end of the created asset name.
+
+# Motivation
+
+Economical, enable more asset names to be created in the exchange.
+
+
+# Rationale
+
+No valid reason was found until now about why this is not allowed. The creation of index style assets will bring new business to the exchange.
+
+# Specifications
+
+Restriction in asset names are detailed in `asset_ops.cpp`:
+
+```
+/**
+ *  Valid symbols can contain [A-Z0-9], and '.'
+ *  They must start with [A, Z]
+ *  They must end with [A, Z]
+ *  They can contain a maximum of one '.'
+ */
+ ```
+ 
+ BSIP proposes to change third rule to:
+ 
+ `They must end with [A, Z0-9]`
+ 
+As file where the changes are needed(`asset_ops.cpp`) do not have access to the database, we are unable to use `head_block_time()` to create the hardfork guard.
+
+The process is more complicated and it is described as follows:(quote from @abit in github ticker: https://github.com/bitshares/bitshares-core/issues/620#issuecomment-364803143):
+
+"To make the change, need to loose the validation code in `asset_ops.cpp`, add a hard fork guard code with original rule to asset_evaluator to make sure no rule change before the hard fork, add corresponding hard fork guard code in proposal_evaluator. After hard fork, those hard fork guard code can be safely removed."
+ 
+# Discussion
+
+[to be added if any]
+
+# Summary for Shareholders
+
+[to be added if any]
+
+# Copyright
+
+This document is placed in the public domain.
+
+# See Also
+
+* https://github.com/bitshares/bitshares-core/issues/620
+* https://github.com/bitshares/bsips/issues/52