# Farcaster \[Verify, secure, and manage a Farcaster account with a Splits account]

[Farcaster](https://farcaster.xyz) is a social network built on Ethereum. A Splits account can hold a Farcaster account's onchain roles: a verified address on your profile, the recovery address that backstops the account, and the payer for protocol storage.

Farcaster's contracts live on Optimism, and you call them from Splits with [custom transactions](/transactions/custom). Contract behavior below is Farcaster's; see their [contract docs](https://docs.farcaster.xyz/reference/contracts/) for the authoritative reference.

## Verifying an address

Farcaster verifies a contract account by checking an [EIP-1271](https://eips.ethereum.org/EIPS/eip-1271) signature **on Ethereum mainnet**, and doesn't accept [ERC-6492](https://eips.ethereum.org/EIPS/eip-6492) signatures from not-yet-deployed contracts. A Splits account produces a plain EIP-1271 signature only once deployed, so before verifying:

1. Enable Ethereum Mainnet for your team in [Settings > Networks](https://app.splits.org/settings/team/networks/).
2. Deploy the account on mainnet by sending any transaction from it there. Accounts deploy on their first transaction per network; once deployed, Etherscan shows a *Contract* tab at the account's address.

Then connect the account at [farcaster.xyz > Settings > Verified addresses](https://farcaster.xyz/~/settings/verified-addresses) using the [browser extension](/introduction/extension) or [WalletConnect](/integrations/walletconnect), and sign the verification message.

## Recovery address

A Farcaster account is controlled by two addresses: a **custody address** that owns the account and authorizes apps, and a **recovery address** that can move the account to a new custody address. The Farcaster app manages both by default; pointing the recovery address at a Splits account (Farcaster app: *Settings > Advanced > Change recovery address*) puts your social account behind the same signers and [threshold](/accounts/thresholds) as your funds.

If you lose the custody address, recover from Splits by calling `recover` on the [IdRegistry](https://docs.farcaster.xyz/reference/contracts/reference/id-registry) (`0x00000000Fc6c5F01Fc30151999387Bb99A9f489b` on Optimism) via a custom transaction. Two requirements: the new custody address must sign an EIP-712 `Transfer` message accepting the move, and it must not already own a Farcaster ID.

## Storage

Farcaster charges yearly rent for the space an account's messages use. Pay it from a Splits account by calling `rent(fid, units)` on the [StorageRegistry](https://docs.farcaster.xyz/reference/contracts/reference/storage-registry) (`0x00000000fcCe7f938e7aE6D3c335bD6a1a7c593D` on Optimism) via a custom transaction, with *Amount to pay* set to the unit price in ETH (`unitPrice()` on the contract; excess is refunded).