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  1. æternity protocol
  2. node
  3. æternity node API

Encoding scheme for API identifiers and byte arrays

PreviousAccount management - intended usageNextState channel WebSocket API

Last updated 1 month ago

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The æternity node uses encoding for identifiers such as account and contract public keys. Base58c is not well suited for encoding big byte arrays, so for general byte arrays base64 is used.

The base64 encoded data is treated in the same way as the base58Check encoded data, i.e., a checksum is postfixed to the binary data before encoding. The checksum is the first four bytes of the sha256 hash of the sha256 hash of the original byte array.

The following erlang snippet shows how the checksum can be computed, and how it is added to the byte array that is to be encoded.

add_check_bytes(Bin) when is_binary(Bin) ->
  <<Check:4/binary, _/binary>> = sha256(sha256(Binary)),
  <<Bin/binary, Check/binary>>.

Both identifiers and general byte arrays are prefixed with a two letter tag and a separator (_), describing the type of data that is encoded. For example an account pubkey could look asak_2a1j2Mk9YSmC1gioUq4PWRm3bsv887MbuRVwyv4KaUGoR1eiKi.

The tags are described below, together with the encoding method of the tag.

Prefix
Encoding
Description

ak

base58

Account pubkey

ba

base64

Byte array

bf

base58

Block Proof of Fraud hash

bs

base58

Block State hash

bx

base58

Block transaction hash

cb

base64

Contract byte array

ch

base58

Channel

cm

base58

Commitment

ct

base58

Contract pubkey

kh

base58

Key block hash

mh

base58

Micro block hash

nm

base58

Name

ok

base58

Oracle pubkey

oq

base58

Oracle query id

or

base64

Oracle response

ov

base64

Oracle query

pi

base64

Proof of Inclusion

pp

base58

Peer pubkey

sg

base58

Signature

ss

base64

State trees

cs

base64

Contract calls state tree

ck

base64

Contract state key

cv

base64

Contract state value

st

base64

State

th

base58

Transaction hash

tx

base64

Transaction

base58Check