| caip | title | author | discussions-to | status | type | created | updated | requires |
|---|---|---|---|---|---|---|---|---|
10 |
Account ID Specification |
Pedro Gomes (@pedrouid) |
Draft |
Standard |
2020-03-13 |
2021-08-11 |
2 |
CAIP-10 defines a way to identify an account in any blockchain specified by CAIP-2 blockchain id.
This proposal aims to facilitate specifying accounts for any blockchain extending CAIP-2 blockchain id specification. This is useful for both decentralized applications and wallets to communicate user accounts for multiple chains using string identifiers specific to each chain. Currently wallets are usually designed for each chain and multi-chain wallets use proprietray data structures to differentiate accounts. This proposal aims to standardize these identifiers for accounts to allow interoperability.
The motivation for proposal stem from designing a chain-agnostic protocol for communication between dapps and wallets that was independent of any blockchain but provide the flexibility to be backwards compatible with existing applications.
The account id specification will be prefixed with the CAIP-2 blockchain ID and delimited with a colon sign (:)
The account_id is a case-sensitive string in the form
account_id: chain_id + ":" + account_address
chain_id: [:-a-zA-Z0-9]{5,41}
account_address: [a-zA-Z0-9]{1,64}
The chain_id is specified by the CAIP-2 which describes the blockchain id.
The account_address is a case sensitive string which its format is specific to the blockchain that is referred to by the chain_id
The goals of the general account ID format is:
- Uniqueness between chains regardless if they are mainnet or testnet
- Readibility using the prefix of a chainId to quickly identify before parsing the address
- Restricted to constrained set of characters and length for parsing
This is a list of manually composed examples
# Ethereum mainnet
eip155:1:0xab16a96d359ec26a11e2c2b3d8f8b8942d5bfcdb
# Bitcoin mainnet
bip122:000000000019d6689c085ae165831e93:128Lkh3S7CkDTBZ8W7BbpsN3YYizJMp8p6
# Cosmos Hub
cosmos:cosmoshub-3:cosmos1t2uflqwqe0fsj0shcfkrvpukewcw40yjj6hdc0
# Kusama network
polkadot:b0a8d493285c2df73290dfb7e61f870f:5hmuyxw9xdgbpptgypokw4thfyoe3ryenebr381z9iaegmfy
# Dummy max length (64+1+8+1+32 = 106 chars/bytes)
chainstd:8c3444cf8970a9e41a706fab93e7a6c4:6d9b0b4b9994e8a6afbd3dc3ed983cd51c755afb27cd1dc7825ef59c134a39f7
Previous legacy CAIP-10 schema was defined by appending as suffix the CAIP-2 chainId delimited by the at sign (@)
# Legacy example
0xab16a96d359ec26a11e2c2b3d8f8b8942d5bfcdb@eip155:1
n/a
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