Syscoin Core 4.4.0

Syscoin Core installation binaries can be downloaded from and the source-code is available from the Syscoin Core source repository.

4.4.0 Release Notes

Syscoin Core version 4.4.0 is now available from:

This release includes new features, various bug fixes and performance improvements, as well as updated translations.

Note: Masternode operators should upgrade their sentinel to v4.4.0

Please report bugs using the issue tracker at GitHub:

Upgrade Instructions: Basic upgrade instructions below:

How to Upgrade

If you are running an older version, shut it down. Wait until it has completely shut down (which might take a few minutes for older versions), then run the installer (on Windows) or just copy over /Applications/Syscoin-Qt (on Mac) or syscoind/syscoin-qt (on Linux).

If you are upgrading from a version older than 4.2.0, PLEASE READ:


Syscoin Core is supported and extensively tested on operating systems using the Linux kernel, macOS 10.15+, and Windows 7 and newer. It is not recommended to use Syscoin Core on unsupported systems.

A target block height of 1586000 has been set as the upgrade blockheight. This will happen at approximately March 23rd 2023.

Nodes not upgraded to Syscoin Core 4.4 will NOT be able to sync up to the network past block 1586000 After the block height, 3 new changes will be activated on the network

  1. Syscoin PODA will launch which adds logic to consensus code related to keccack based blobs and an NEVM precompile to access it read
  2. V19 BLS upgrade to the standard IETF spec
  3. Specific NEVM upgrades:

This upgrade brought in upstream changes from Bitcoin from 22.1 - 24.0.1 and tracking on the latest commit on master branch. For changelog brought in from upstream, please see the release notes from Bitcoin Core.

Syscoin Core should also work on most other Unix-like systems but is not as frequently tested on them.

From Syscoin Core 4.4.0 onwards, macOS versions earlier than 10.15 are no longer supported.

Syscoin Core Changes

Bitcoin 24.0+ Core engine is now used to power consensus and security of Syscoin Core. The changeset is here in this Pull request. Note that wallet users now by default will get descriptor wallets enabled. If you are a masternode or a service that requires legacy wallets you may still create them by setting the descriptor field to false when creating wallets.

Block Structure Change

  • Syscoin PoDA activates

Syscoin Core asset interface removed

  • Calls to interact with Syscoin assets have been removed from Syscoin Core. Assets can still be accessed using syscoinjs-lib or Pali Wallet.

V19 BLS Upgrade

  • Once v19 hard fork is activated protx_register, protx_register_fund, protx_register_prepare RPCs will decode BLS operator public key using new basic BLS scheme. In order to support BLS public keys encoded in legacy BLS scheme a legacy parameter was added to those RPC functions.


Once the hard fork is activated, quorumPublicKey will be serialised using basic BLS scheme. To support sync of old chain,version field indicates which scheme to use for serialisation of quorumPublicKey.

Version Version Description
1 qcommit serialised using legacy BLS scheme
2 qcommit serialised using basic BLS scheme


Starting with protocol version 70017, the following field is added to the MNLISTDIFF message between cbTx.

Field Type Size Description
version uint16_t 2 Version of the MNLISTDIFF reply

The version field indicates which BLS scheme is used to serialise all SML entrie’s pubKeyOperator field of mnList.

Version Version Description
1 Serialisation of pubKeyOperator using legacy BLS scheme
2 Serialisation of pubKeyOperator using basic BLS scheme

ProTx txs family

proregtx and proupregtx will support a new version value:

Version Version Description
1 Serialisation of pubKeyOperator using legacy BLS scheme
2 Serialisation of pubKeyOperator using basic BLS scheme

proupservtx and prouprevtx will support a new version value:

Version Version Description
1 Serialisation of sig using legacy BLS scheme
2 Serialisation of sig using basic BLS scheme

BLS enforced scheme

Once the hard fork is activated all remaining messages containing BLS public keys or signatures will serialise them using the new basic BLS scheme.

List of affected messages: mnauth, govobj, govobjvote, qsigshare, qsigrec, clsig, all DKG messages (qfcommit, qcontrib, qcomplaint, qjustify, qpcommit);


  • getnevmblobdata: Return NEVM blob information and status from a version hash.
  • listnevmblobdata: List existing NEVM blobs
  • syscoincreatenevmblob: Create a NEVM blob

Removed RPC

  • addressbalance
  • assetallocationbalance
  • assetallocationburn
  • assetallocationmint
  • assetallocationsend
  • assetallocationsendmany
  • assetnew
  • assetsend
  • assetsendmany
  • assetupdate
  • assettransfer
  • listunspentasset
  • sendfrom



Thanks to everyone for the continued support of Syscoin