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Nebulas Address Design

Nebulas address system is carefully designed. As you will see below, both account and smart contract address are strings starting with a "n", which could be thought of as our faith Nebulas/NAS.

Account Address

Similar to Bitcoin and Ethereum, Nebulas also adopts elliptic curve algorithm as its basic encryption algorithm for Nebulas accounts. The address is derived from public key, which is in turn derived from the private key that encrypted with user's passphrase.Also we have the checksum design aiming to prevent a user from sending Nas to a wrong user account accidentally due to entry of several incorrect characters.

The specific calculation formula is as follows:

1.  content = ripemd160(sha3_256(public key))
    length: 20 bytes
                         +--------+--------+------------------+
2.  checksum = sha3_256( |  0x19  +  0x57  |      content     | )[:4]
                         +--------+--------+------------------+
    length: 4 bytes

                        +--------+---------+-----------------+------------+
3.  address = base58( |    0x19  |  0x57   |     content     |  checksum  | )
                        +--------+---------+-----------------+------------+
    length: 35 chars

0x57 is a one-byte "type code" for account address, 0x19 is a one-byte fixed "padding"

At this stage, Nebulas just adopts the normal bitcoin base58 encoding schema. A valid address is like: n1TV3sU6jyzR4rJ1D7jCAmtVGSntJagXZHC

Smart Contract Address

Calculating contract address differs slightly from account, passphrase of contract sender is not required but address & nonce. For more information, please check smart contract and rpc.sendTransaction. Calculation formula is as follows:

1.  content = ripemd160(sha3_256(tx.from, tx.nonce))
    length: 20 bytes
                         +--------+--------+------------------+
2.  checksum = sha3_256( |  0x19  |  0x58  +      content     | )[:4]
                         +--------+--------+------------------+
    length: 4 bytes

                      +--------+---------+-----------------+------------+
3.  address = base58( |  0x19  |  0x58   |     content     |  checksum  | )
                      +--------+---------+-----------------+------------+
    length: 35 chars

0x58 is a one-byte "type code" for smart contract address, 0x19 is a one-byte fixed "padding"

A valid address is like: n1sLnoc7j57YfzAVP8tJ3yK5a2i56QrTDdK