Copay is a Multisig HD Wallet. Copay app holds the extended private keys for the wallet. The private key never leaves the device, so for accessing a wallet funds it is necesary to have the device or a backup of the wallet.
* Wallet Seed (WS): 12 words mnemonic backup (available from Copay v1.2+). The 12 words are used as wallet seed, following BIP39 specification. The wallet seed may require a passphrase to recreate the wallet (if one was specified at creation time).
* Wallet Backup (WB): Exported data from Copay, containing an AES encrypted JSON with many wallet parameters (like extended private key, wallet name, extended public keys of copayers, etc. See #export-format). This data can be created from Copay v1.2+ (Settings -> Export) and it was the default backup format on previous Copay versions. WB can be a file (standard format for Copay desktop versions) or a text (standard for Copay mobile versions).
* Basic Recovery: Wallet access is restored. It is possible to see wallet balance and past transactions. It is possible to send and receive payments.
* Full Recovery: All the features of Partial Recovery + wallet name, copayer names are recovered, past payment proposal metadata (who signed, and notes) are recoved.
- Go to 'Create Wallet', and enter the WS at 'Advanced Options'. Select a new name for the restored wallet. Total and required number of copayers should be set to 1.
- Enter one WS at Create (at the Advanced option section). Note that the wallet configuration (M-of-N and network paramenters) needs to match the parameters that where entered when the wallet was first created. Wallet name and copayer nicknames need to be entered also, but there is no need for them to match the original wallet setup.
- Ask other copayers to join the wallet using the given invitation code. All copayers need to enter their WS at Join (at -> Advanced Options -> Wallet Seed).
In this case, Copayers will not be able to decrypt the 'notes' field on the new Spend Proposals, because the shared secret stored at the WD is not longer known by other copayers.