Bytom is the infrastructure of asset Internet.
Any peer-to-peer financial applications and asset applications
from institutions and individuals could be built on Bytom chain.

Technical White Paper 中文 English

Tensority-v1.2 English

Compatible with the UTXO

Bytom consists of three layers: data transaction and transmission layer, contract layer and asset interaction layer. The asset interaction layer operates on the assets by calling contracts. The data transaction and transmission layer is compatible with the UTXO model and the transaction data structure of Bitcoin to achieve high-speed concurrence and controllable anonymity.

General address format

BIP32, BIP43 and BIP441are used in the design of Bytom wallet to provide support for multi-currency, multi-account, multi-address and multi-key with Hierarchical Deterministic Wallets (or "HD Wallets"). BIP44 provides a five-layer path recommendation: (1) to determine the path rules; (2) types of currency; (3) account; (4) change; (5) index of address index. Users can control wallet for all assets by saving one master private key.

Compatible with National Encryption Standard

The asset management and operation of Bytom involves private key, public key and address system, which is achieved through ESCDA encryption and SHA256 hashing in Bitcoin’s design. Bytom will support the Public Key Cryptographic Algorithm SM2 Based on Elliptic Curves 2 and SM3 Cryptographic Hash Algorithm 3 that are compliant with Chinese National standard. In terms of similar computational complexity, SM2 is much faster than RSA and DSA in processing private keys, thus a higher efficiency in encryption. The compression function of SM3 algorithm has similar structure to that of SHA-256. But the design of SM3 algorithm is more complicated. For example, two message words are used for each round of compression function.

Asset naming using ODIN

The naming of assets will follow ODIN (Open Data Index Name) standards to ensure the uniqueness of assets across the entire network and blockchain. Unlike other blockchain-based identification solutions, ODIN is based on the Bitcoin blockchain and supports the introduction of other blockchains (public blockchain, consortium blockchain, private blockchain) through multi-level marking. ODIN uses blockchain height as naming index instead of registration of character string.

Separate transaction signatures from the rest of the data in a transaction

In Bytom’s design, there is a DLT protocol that allows interaction between a variety of assets. Multiple blockchains that adopt the same protocol can exist independently and can be traded cross-chain, making different operators to interact in the same format. Following the principle of minimum authority, Bytom Separate transaction signatures from the rest of the data in a transaction,in the design to achieve isolation between asset management and synchronized distributed ledgers. Such design achieves better programmability and contract support, and reserve interface for bypass channel in the future.

Enhanced trading flexibility

Unlike the Ethereum account model, BUTXO can verify transactions in parallel by adopting a mechanism similar to nonce to ensure that each unspent outputs could only be quoted by one transaction. In addition, Bytom is lighter than Ethereum in nature as participants only need to remember unspent outputs as the trade itself carries other relevant information (such as asset ID, units, controller program). Another feature of Bytom is: compact verification, which allows the client to verify the relevant transaction only instead of all the transactions in the block by trusting the amounts signed by the sender. The whole process is realized via Merkle proof.

Cross-chain asset dividends distribution through side-chain

Developers can create a tiny version of the X chain (other blockchains) or Xrelay based on Bytom platform,They could also perform API calls via smart contract to verify network activities on X blockchain, thus achieving cross-chain communication, asset transaction and dividend distribution in the contract.