## NOTE The below requires norsyr's fix to `decompress-point` in order to work. ## Working with BTC RPC Library ``` :btc-node-hook|command [%credentials 'http://127.0.0.1:18443' 'poopman' 'chAiM31eeJ1MK3y8BC3mR9q2'] :btc-node-hook|action [%get-block-count ~] ``` ## btc-address **Import lib; optionally set up env** ``` =btca -build-file %/lib/btc-address/hoon =mnemonic="abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about" =bip32 -build-file %/lib/bip32/hoon =ecc secp256k1:secp:crypto =zpub "zpub6rFR7y4Q2AijBEqTUquhVz398htDFrtymD9xYYfG1m4wAcvPhXNfE3EfH1r1ADqtfSdVCToUG868RvUUkgDKf31mGDtKsAYz2oz2AGutZYs" ``` **Test child public key from xpub** ``` `@ux`(child-from-xpub:btca zpub 0) (child-from-xpub:btca xpub (dec (bex 31))) :: should error as index is too high (hardened key range) (child-from-xpub:btca zpub (bex 31)) ``` **Same, with Jose's bip32 library** ``` :: get 0 index in non-change account `@ux`(compress-point:ecc pub:(derive-public:(derive-public:(from-extended:bip32 zpub) 0) 0)) ``` ## Deprecated: `btc-address` Child Derivations **Test xpub parsing** ``` (parse-xpub:btca xpub) ``` **Test addition and ECC point checking** ``` =px (parse-xpub:btca xpub) =pubk ?~ px ~ pubk.u.px (is-point:btca pubk) (pubkey-to-point:btca pubk) =index 256 `@ux`(add (lsh 3 4 (big-endian-brap:btca pubk)) index) ``` **Test computing I** ``` (bind px |=(px=parsed-xpub:btca (compute-i:btca px 1))) ```