caip | title | author | discussions-to | status | type | created | updated | requires | superseded-by |
---|---|---|---|---|---|---|---|---|---|
4 |
Blockchain Reference for the BIP122 Namespace |
Simon Warta (@webmaster128), ligi <ligi@ligi.de>, Pedro Gomes (@pedrouid) |
Superseded |
Standard |
2019-12-05 |
2020-01-16 |
2 |
This document is about the details of the BIP122 namespace and reference for CAIP-2.
In CAIP-2 a general blockchain identification scheme is defined. This is the implementation of CAIP-2 for BIP122 (Bitcoin).
See CAIP-2.
The namespace is called "bip122" as in BIP122.
The definition is delegated to BIP122's chain ID definition. The format is a 32 character prefix of the block hash from BIP122 (lower case hex).
To resolve a blockchain reference for the BIP122 namespace, make a JSON-RPC request to the blockchain node with method getblockhash
, for example:
// Request
{
"id": 1,
"jsonrpc": "2.0",
"method": "getblockhash",
"params": [0]
}
// Response
{
"id": 1,
"jsonrpc": "2.0",
"result": "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"
}
The response will return as a value for the result a hash for the block with height 0 that should be sliced to its first 16 bytes (32 characters for base 16) to be CAIP-4 compatible.
We delegate the identification of Bitcoin-like chains to BIP122, as this is the best Bitcoin chain identification standard known to the authors of this CAIP.
Not applicable
This is a list of manually composed examples
# Bitcoin mainnet (see https://github.com/bitcoin/bips/blob/master/bip-0122.mediawiki#definition-of-chain-id)
bip122:000000000019d6689c085ae165831e93
# Litecoin
bip122:12a765e31ffd4059bada1e25190f6e98
# Feathercoin (Litecoin fork)
bip122:fdbe99b90c90bae7505796461471d89a
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