Coin Dance

Zero-Knowledge Subchain

 Bitcoin ABC

Bulletproof privacy.

EVM Subchain

 Bitcoin ABC

Scalable smart contracts & improved privacy.

Fractional Satoshis

 Bitcoin ABC

Allow for denominations smaller than 1 satoshi.

Taproot

 Bitcoin ABC

Taproot is an interesting technology to enable multiparty privacy on a bitcoin.

Zero-Knowledge Contingent Payments

 Bitcoin ABC

Facilitate large scripts by moving them off-chain but tying them to a simple verify-only smart contract on-chain.

Deep Link Payment Protocol

 Bitcoin ABC | Lokad SAS

The Deep Link Payment Protocol is meant to be used for communication between mobile wallet app and other applications.

Allow fee-free spending of old UTXOs

 Bitcoin ABC

Guarantee that old UTXOs spent without a miner fee attached will make it into a block. These are also known as "Priority Transactions".

Metadata Subtree

 Bitcoin ABC | Lokad SAS

Support for better, more detailed block-level metadata.

Merklix Trees

 Bitcoin ABC | Lokad SAS

Reference Indexer

 Bitcoin ABC

An indexer is like a programmatic block explorer. All eCash businesses need an indexer in one form or another, for example for address indexing. We aim to create a reference indexer that won’t break as we continue developing Bitcoin ABC, thereby providing a major benefit to the ecosystem.

Avalanche Pre-Consensus

 Bitcoin ABC

Allow miners to come to consensus on double spend transactions before they have been mined into a block.

Overhaul Mempool Acceptance

 Bitcoin ABC

Improve mempool acceptance to eliminate the 50-unconfirmed chain transaction limit, improve the fee structure, increase parallelizations and block construction, and increase maintainability.

Reusable Payment Addresses

 Bitcoin ABC | Stamp

This draft reusable address format, if widely adopted, seeks to provide a major improvement over existing systems in terms of net gain in all five areas, as well as more flexibility in choosing desirable compromises depending on usecases under one common format.

UTXO commitments

 Bitcoin ABC

The construction of a 32-byte hash that is uniquely defined for a UTXO set, that is, the set of all unspent transaction outputs that exist at a certain block in the blockchain

Allow <100 byte txs except those of 64 bytes

 Bitcoin ABC

This rule prevents a hash griding attack, where SPV wallets can confuse a 64 byte transaction for a merkle node. The amount of entropy in each 32-byte sections of the transaction is insufficient to prevent a preimage attack. In this case, a valid transaction could be found with a hash equal to the first, or last, 32 bytes of a 64-byte transaction.

Modified fee structure

 Bitcoin ABC

Modified fee structure to allow for an order of magnitude decrease in fees for typical transactions (not strictly a consensus change, but an important change being included with the release).

Staking Rewards

 Bitcoin ABC

The avalanche network requires that miners allocate a portion of the block subsidy to stakers as an incentive for securing the network. Each block in the avalanche network deterministically calculates the next staker to receive a reward based on the previous block hash and how much has been staked. As a result, every participant has a chance of getting the full reward, and the likelihood increases in proportion to the amount they have staked.

Switch base unit to "bits"

 Bitcoin ABC

Greatly improve usability by switching the base unit to "bits", equal to 100 satoshis.

Consensus-enforced transaction version

 Bitcoin ABC

The version field of eCash transactions will be restricted to versions 1 or 2 by the consensus rules. This means that blocks containing a transaction with a different version number can no longer be mined. The purpose of this change is to pave the way for future implementation of a new transaction format. It will allow the new transaction format to use a version number that has never been used before in the eCash blockchain. This rule was previously enforced by policy, so no wallet update is required.

Policy-enforced Miner Fund

 Bitcoin ABC

The miner fund, part of the block reward that is funding eCash network development, will no longer be enforced by consensus but instead by policy. A block that contains an invalid or no miner fund output will be rejected by Avalanche Post-Consensus. This will make it easier for updating the miner fund parameters such as the acceptable addresses and also paves the way for staking rewards.

Remove the Chained Unconfirmed Tx Limit

 Bitcoin ABC

Bitcoin ABC nodes will start accepting an unlimited number of chained transactions in the mempool. This was limited to 50 transactions before the upgrade. Note that this is a policy change and has no impact on the consensus rules.

Avalanche Post-Consensus

 Bitcoin ABC

1-conf finality and reorg protection.

I2P

 Bitcoin ABC

I2P (Invisible Internet Project) is a project meant to provide an anonymity layer, so user can communicate anonymously using a range of applications.

This provides eCash node operators with the option to operate their node privately using an alternative to TOR.

Switch default operating mode to XEC

 Bitcoin ABC

Nodes will now run in eCash mode be default, using both the new XEC address format and units (bits).

eCash Rebrand

 Bitcoin ABC

A much improved brand, separating the development team (Bitcoin ABC) from the network (eCash).

Coin Base Funding Rule

 Bitcoin ABC

Require 8% of each block reward to be sent to a specified Bitcoin Cash address.

Switch DAA to ASERT

 Bitcoin ABC | Independent | BCHN