Tenzro Namespace - Chains

CAIP-2

For context, see the CAIP-2 specification.

Rationale

In CAIP-2 a general blockchain identification scheme is defined. This is the implementation of CAIP-2 for Tenzro. Blockchains in the “tenzro” namespace are validated by their genesis block hash; each chain runs an independent HotStuff-2 BFT consensus instance with its own genesis block and validator set. Genesis hashes are 32-byte SHA-256 digests of the canonical genesis block; their first 32 hex characters are used as the CAIP-2 reference.

Syntax

The namespace “tenzro” refers to the Tenzro Network protocol.

Reference Definition

The CAIP-2 reference for a Tenzro chain is the lowercase hexadecimal encoding of the first 16 bytes (32 hex characters) of the genesis block hash:

chain_id := "tenzro:" + lowercase(hex(genesis_hash[0..16]))

This conforms to CAIP-2’s reference grammar [-a-zA-Z0-9]{1,32}.

Resolution Method

To resolve a Tenzro chain reference, make a JSON-RPC request to the chain’s RPC endpoint with method tenzro_getBlock and the genesis block height (block_number: 0):

// Request
{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tenzro_getBlock",
  "params": [{ "block_number": 0 }]
}

// Response (truncated to relevant fields)
{
  "id": 1,
  "jsonrpc": "2.0",
  "result": {
    "hash": "92bd27db9713293097f0e63476e3911e77b706c1b20f4a5e97d44fe7a8d51648",
    "header": {
      "height": 0,
      "chain_id": 1337
    }
  }
}

The hash field is a 64-character lowercase hex string (32 bytes). Truncate it to the first 32 characters to obtain the CAIP-2 reference.

EVM-compatible callers may also use eth_chainId to retrieve the integer chain ID, but that integer is not the CAIP-2 reference — the canonical reference always uses the truncated genesis hash.

Backwards Compatibility

Not applicable. Tenzro is a fresh L1 with no prior CAIP-2 registration.

Test Cases

# Tenzro Testnet
#   genesis hash: 92bd27db9713293097f0e63476e3911e77b706c1b20f4a5e97d44fe7a8d51648
#   integer chain_id (EVM-compat): 1337
tenzro:92bd27db9713293097f0e63476e3911e

# Tenzro Mainnet (TBD — populated at mainnet launch)
tenzro:<genesis_hash[0..16] in lowercase hex>

Until mainnet is launched, only the testnet reference above is canonical.

References

• CAIP-2
• Tenzro Network repository
• HotStuff-2 BFT

Copyright

Copyright and related rights waived via CC0.

Citation

Please cite this document as:

Tenzro Engineering (eng@tenzro.com), "namespaces/tenzro-caip2: Tenzro Namespace - Chains [DRAFT]," Chain Agnostic Namespaces, tenzro-caip2, May 2026 / May 2026. [Online serial]. Available: https://github.com/ChainAgnostic/namespaces/tenzro-caip2.md