# Release Note 0.5.1

### **Accumulate 0.5.1 -** April 30th 2022 

🚀  **New** 

* We have added support for executing multiple key page updates as a single transaction (We have added a multi-operation key page updates) 
* We added API support for other signature types 
* Create an access control framework 
* Add transactions for adding, removing, updating a validator 
* Envelope and synthetic transaction redesign 
* Capture evidence from Tendermint 
* Capture votes from Tendermint 
* Create index chains 
* Add an API call that constructs a proof of the state of an account 
* Add memo and metadata field to the transaction 
* CLI Command to display how many Credits you receive per ACME 
* Add the ability to lock a key page 
* Support Factom RCD1 signatures 
* We created Sub-ADIs 

 

🔧  **Fixes** 

* A synthetic transaction with an invalid origin is not saved 
* We fixed a bug that could cause the TestNet to stall due to an invalid synthetic transaction We built a solid Monitoring infrastructure 

 

🔧 **Improvements** 

* Key page entries must be key hashes 
* Deprecate extids on data accounts 
* Document API methods 
* Rename the pending chain 
* Run two nodes side-by-side 
* Use 'timestamps' instead of 'nonces' 
* Track the key page version 
* Track issued tokens instead of remaining reserve 
* Accumulate only check the nonce of the first signature 
* Burn ACME to buy credits 
* We added Nest Key Pages with Key Books (acc://ethan/book/1) 
* Keys must be hashed with SHA-256