v3.4.0

• Sendproofs are now in base58 format, which eases copying and sharing.
• New addresses now start from bcnZ prefix.

Command line changes/additions

• New walletd command-line parameter --wallet-type to create legacy wallets (--create-wallet by default creates new HD wallet).

API removal

• Removed amethyst_only flag in the get_random_outputs bytecoind method.

v3.4.0-beta-20181218

• Signatures are now fully prunable (but not yet pruned) via modification to transaction hash calculations.
• A view-only wallet now shows address balance even for non-auditable unlinkable addresses, but only if sender follows the protocol. If in doubt about sender's fair play, auditable addresses should be used instead.
• A view-only wallet can now be exported with or without ability to view transaction destination addresses.
• bytecoind will not automatically look for blocks.bin anywhere. If you need to import blocks from file, use --import-blocks=<folder> command line parameter.
• bytecoind command line parameters --ssl-certificate-pem-file, --ssl-certificate-password removed, use ngnx in https proxy mode!

v3.4.0-beta-20181212

Consensus update (hard fork)

• The release starts immediate voting in the stagenet. Voting in the mainnet will start when v3.4.0 is released.
• Introduce new unlinkable addresses, stored in new HD wallet. Single mnemonic is enough to restore all wallet addresses.
• Destination addresses can now be derived from blockchain with wallet secrets, so saving history is now unnecessary.
• Greatly simplified maximum block size calculations. Miners will now explicitly vote for maximum block size (up to hard limit of 2 MB), depending on how many expensive transactions are in memory pool. Reward penalties are removed and most other unnecessary checks on block/transactions sizes are also removed from consensus.
• New HD wallet is encrypted with chacha20 with salt (major improvement to previous wallet format)
• New auditable addresses, guaranteed to always have balance exactly equal to what view-only version of the same wallet shows (useful for public deposits).
• Signatures are now half size.
• The requirement that coinbase transactions are locked for 10 blocks is removed from consensus.
• Creating 6-digit dust (or other not round output amounts) are now prohibited by consensus rules.
• Minimum anonymity is now 3 (4 output references per input). This does not apply to dust or not round outputs.
• bytecoind now calculates output obfuscation value, and does not use less-than-ideal outputs for mix-in

Command line changes/additions

• New walletd command-line parameter to set creation time when importing keys or mnemonic (which have no inherent timestamp)
• New walletd command-line parameter to generate mnemonics
• New walletd command-line parameter to create unlinkable wallet from mnemonics
• New walletd command-line parameter to enable getting secrets bia JSON RPC API

Specific API improvements

• By default, getting secrets via JSON RPC API is disabled.
• New walletd method 'get_wallet_records' with optional 'create' parameter can be used to get (creating if needed) wallet records from linkable wallet
• New walletd method set_address_label to set labels for addresses (labels are returned by get_wallet_records)
• New error code TOO_MUCH_ANONYMITY (-305) can be returned from create_transaction.

API deprecations (will be removed in version 3.5.0)

• walletd method get_addresses is marked as deprecated, use get_wallet_records instead.
• walletd method get_view_key_pair is marked as deprecated, use get_wallet_info with need_secrets set to true instead.
• walletd method 'create_transaction' has 'save_history' and 'save_history_error' deprecated, because history is now always implicitly saved to blockchain.
• next_block_effective_median_size renamed to recommended_max_transaction_size with next_block_effective_median_size deprecated.

Incompatible API changes

• parent_block is renamed to root_block in all contexts without deprecation, due to widespread confusion.

Improvements to P2P protocol to handle large network load

• Header relay instead of block body relay. In most cases receiver will reasemble block from memory pool. In rare case when this is not possible, the block body will be requested.
• Transaction description relay instead of transactions body relay. Only new transactions will be requested. Transaction descriptions contain most recent referenced block hash, so that receiver can easily distinguish between "wrong signatures due to malicious intent" and "wrong signatures due to chain reorganisations"
• Incremental memory pool sync with cut-off limit by fee/byte. Allows pools with huge assymetry in size to quickly get into stable state.

Other changes

• Memory pool size increased to 4 MB.
• walletd will automatically rebuild wallet cache after upgrade to this version. This can take long time for large wallets.

v3.3.3

• Fixed bug when walletd fails to create transactions for certain coins.

v3.3.2

• Now all folders we get from user/system are normalized by removing excess slashes from the tail

v3.3.1

• The create_transaction method can now create transactions with fee < 0.01 BCN iff both fee_per_byte and transaction size are small enough.
• In the create_transaction method, if any_spend_address is set to true, leaving change_address empty now sets it to first wallet address.
• Added amounts to the message of the TRANSACTION_TOO_BIG error so that you see how much you can actually send (with desired or zero anonymity).
• Added a new new flag subtract_fee_from_amount to the create_transaction method to indicate subtracting fee from receivers.
• Tweaked the distribution of mix-in outputs returned by the get_random_outputs method to make it .
• Fixed error in the getblocktemplate and get_block_template methods which returned wrong reserved_offset.

v3.3.0

Consensus update (hard fork)

• Voting starts immediately, once 90% of mined blocks contain votes for update, the update height will be automatically selected so that consensus update will happen approximately 2 weeks after that.
• Market fees - any transaction fee including 0 is now legal for all transactions. Miners will increase block size only if it is profitable for them in a short run.

General improvements

• Better priority and exclusive nodes logic.
• Seed nodes are now contacted approximately once per day (greatly helps to catch up after bytecoind is started for users who run it after delay of several weeks or more).
• Binary methods now share single access point /binary_rpc.
• Code for consensus upgrade voting correctly counts votes on both main chain and each side chain.
• Limited on incoming connections (default is 100).
• Fixed ignored external port on peer handshake (made connects through exposed non-standard ports to nodes behind NAT impossible).
• Groestl hash function is updated from the official source.
• Keccak permutation function is updated from the official source.
• bytecoind never searches for blocks.bin and blockindex.bin outside the data folder.
• now when you specify --p2p-bind-address, but not --p2p-external-port, p2p external port will be set to p2p bind port. When you wish NAT tunneling, good practice is to specify both.

Command line changes/additions

• Paranoid mode to check every byte of blockchain when downloading (usually checks only blocks beyond the last checkpoint).
• Warning: Now walletd exits by default after --create-wallet and --set-password operations. This change can break your scripts. If you need the wallet running after those commands, you can add --launch-after-command parameter
• Now you can use --set-password with --export-view-only and --backup-wallet-data, to encrypt result wallet with a different password.
• Fixed bug with walletd not returning api::WALLETD_BIND_PORT_IN_USE error code when the JSON API port is in use and using inproc bytecoind.
• Fixed bug with bytecoind not returning api::BYTECOIND_BIND_PORT_IN_USE error code when the JSON API port is in use.
• walletd now prints address after creation of wallet.
• walletd now prints deprecation warning when using inproc bytecoind.
• walletd now binds to port 9070 on testnet and 10070 on stagenet resp. by default.

General API improvements

• Optimisation of JSON RPC calls (2x speed up on very large responses).
• Made the jsonrpc argument mandatory with value "2.0" in all JSON RPC calls according to the spec.
• JSON RPC id is required now according to spec.
• JSON RPC error's additional data moved into data object inside the error object according to spec.
• Now any field in requests that daemons do not understand will be reported as a error.
• Much better error handling, more specific error codes.

Specific API improvements

• New get_block_header method for blockchain structure inspection (to replace getblockheaderbyhash, getblockheaderbyheight, and getlastblockheader legacy methods).
• New get_wallet_info method.
• New VIEW_ONLY_WALLET (-304) error code, returned from create_transaction.
• In methods supporting longpoll (get_status and get_block_template) all longpoll arguments are now optional. So, for example, if you are interested in outgoing_peer_count only, you can specify only outgoing_peer_count in request and get response when outgoing_peer_count changes. Changes to other fields will not trigger response to longpoll.
• New ADDRESS_FAILED_TO_PARSE (-4) and ADDRESS_NOT_IN_WALLET (-1002) error codes, returned from lots of methods
• New fields in get_addresses request/response to iterate through list of addresses
• Now top_block_timestamp_median returned correctly from get_status JSON RPC methods.
• New need_signatures fields in APIs returning raw transactions.
• check_sendproof now returns values from sendproof in response if proof is valid.
• All methods return new correct values for block_size and transactions_cumulative_size.
• get_raw_block and get_block_header now return orphan_status and depth (consistent with height_or_depth fields where top block is -1).
• get_random_amounts has no more depth limit of 128 block (distribution would be skewed a bit for very large depths).
• get_statistics response now includes much more information.
• submit_block now returns block_header in result.
• All transfer objects now have transaction_hash field - especially useful when processing unlocked_transfers in result of get_transfers method.

API deprecations (will be removed in version 3.4.0)

• In all output and transaction objects unlock_time is deprecated (renamed to unlock_block_or_timestamp).
• In all output objects global_index deprecated (renamed to index).
• In get_random_outputs request outs_count is deprecated (renamed to output_count).
• In get_transfers request desired_transactions_count is deprecated (renamed to desired_transaction_count).
• In all transaction objects 'binary_size' is deprecated (renamed to size).

Incompatible API changes

• get_raw_transaction method now returns json error -5 if transaction not found.
• Deprecated prev_hash field remains only in result of legacy methods (getblockheaderbyhash, getblockheaderbyheight, and getlastblockheader legacy methods), use 'previous_block_hash' instead.
• Deprecated total_fee_amount field remains only in result of legacy methods (getblockheaderbyhash, getblockheaderbyheight, and getlastblockheader), use transactions_fee instead.
• Deprecated transactions_cumulative_size field remains only in result of legacy methods (getblockheaderbyhash, getblockheaderbyheight, and getlastblockheader), use transactions_size instead.

Incompatible API changes (likely to affect only developers of block explorers)

• In all raw block objects global_indices renamed to output_indexes.
• In all raw transaction objects vin, vout renamed to inputs, outputs resp.
• In all raw output objects key renamed to public_key.
• In all raw output objects target object removed and all its fields moved into raw output object.
• In all raw coinbase input objects block_index renamed to height.
• In all raw header objects (including parent_block) miner_tx, base_transaction_branch renamed to coinbase_transaction, coinbase_transaction_branch resp.
• In all raw input and raw output objects, tag:ff renamed to type:coinbase and tag:02 renamed to type:key.

Testnet/Stagenet related

• New command line parameter --net=test|stage|main configures daemons for testnet, stagenet, or mainnet resp.
• For testnet time multiplier can now be set to speed up all processes 10x, 100x or even more.
• When participating in testnet or stagenet, bytecoind now uses UDP Multicast to announce/discover other bytecoind nodes in local network. Thus in most local networks testnet will self-assemble without seed nodes. In mainnet multicasts are disabled due to anonymity concerns.
• Testnet/Stagenet now have fixed 1MB max block size limit.

v3.2.4

• Added the testnet functionality.
• Fixed WRONG_BLOCKCHAIN problem when walletd ends up in a state where it could not sync with bytecoind.
• Put a stop to infinite attempts to download blockchain from nodes lagging behind.

v3.2.3

• Fixed issues in SQLite logic in x86-32 daemons.
• Fixed a bug in the downloader, which hinders normal downloading blocks.

v3.2.2

• Fixed an output bufferization issue in the bytecoind daemon.
• Fixed a rare downloader's crash on Windows.