# btc-wallet-* Scratch Code ## xpub ``` =xpub1 'zpub6r8dKyWJ31XF6n69KKeEwLjVC5ruqAbiJ4QCqLsrV36Mvx9WEjUaiPNPGFLHNCCqgCdy6iZC8ZgHsm6a1AUTVBMVbKGemNcWFcwBGSjJKbD' =xpub2 'xpub6D7yaZieZEeG617UcKXDhbsDeso6bmxSAiGWkvkASoiwcjaRtrH5HeNRnDT25s7zmxYzj6MtFe32dVqcf9YcBKKgn9THHjwn2uSjkvobK4e' =bl -build-file %/lib/btc-wallet-store/hoon ``` ### add ``` :btc-wallet-store|action [%add-wallet xpub ~ ~] ``` ### get address at indices ``` =walt1 (from-xpub:walt:bl xpub1 ~ ~) (get-address:walt1 %0 0) ``` ### update address data ``` =walt1 (from-xpub:walt:bl xpub1 ~ ~) (~(mk-address walt1 %0) 0) :: gives bc1q0adfj7ur750hjwufzzlfj5ytqzsnd7fz9fjuzc =walt1 (~(insert-address walt1 %0) [%bech32 'bc1q0adfj7ur750hjwufzzlfj5ytqzsnd7fz9fjuzc'] [%0 0 ~]) nixt.st.walt1 :: gives [p=1 q=0] (nixt updated since it was 0) =walt1 (~(insert-address walt1 %0) [%bech32 'bc1qa5jcdww8u8493zttjjf6q5wu89e6knpvmsh7x4'] [%0 2 ~]) nixt.st.walt1 :: gives [p=1 q=0] (no update) =walt1 (~(insert-address walt1 %0) [%bech32 'bc1qvqrdh8suyv63ntaa0d7hmcamavv8283sngh6e5'] [%0 1 ~]) nixt.st.walt1 :: gives [p=3 q=0] (skips index 2, since already a used address there) =walt1 (insert-address:walt1 [%bech32 'bc1qvqrdh8suyv63ntaa0d7hmcamavv8283sngh6e5'] [%0 4 ~]) :: gives error, because address is inserted at the wrong index ``` ### generate new address (for receiving payment) ``` =walt1 (from-xpub:walt:bl xpub1 ~ ~) =res ~(gen-address walt1 %0) p.res nixt.st.q.res :: gives :: [%bech32 'bc1q0adfj7ur750hjwufzzlfj5ytqzsnd7fz9fjuzc'] :: [p=1 q=0] ``` ## Algos ### Scan addresses * types - req-id=@ux: hash160 of (cat xpub chyg) * maps: - scans ([xpub chyg] -> waltscan) - pend/fail: (req-id -> [=idx key=[xpub chyg]]) - timeouts: (req-id -> @da) -- store Behns for each req * start scan - get `nixt` from wallet - generate - store their indexes in scan - send address+ idx [xpub chyg] to provider #### in wallet-hook * send address-watch req - send address to provider with req-id - set a Behn for 30s, put in timeouts * on response from server - check whether idx in `scanning`--ignore if not (old response) - insert the address into the wallet **if it's used** - if used, update `has-used` for this xpub to be true - delete idx from `scanning` jug - check whether scanning is now empty. If it is, check whether has-used is true * on error * on timeout ### Monitor addresses - nixt also stores next 50 addresses for each account. - every update-address call also checks those :: ++ send-address-update |= [xpub=tape =walt a=address:btc us=(set utxo)] ^- (quip card _state) :_ state(walts (~(put by walts.state) xpub walt)) ~[[%give %fact ~[/wallets] %btc-wallet-store-update !>([%address a us])]] ::