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SLIP-0032 : Extended serialization format for BIP-32 wallets

Number:  SLIP-0032
Title:   Extended serialization format for BIP-32 wallets
Type:    Standard
Status:  Draft
Authors: Pavol Rusnak <stick@satoshilabs.com>
Created: 2017-09-06

Abstract

BIP-0032 already defines a serialization format for hierarchical deterministic keys. In this document we present extended version of the serialization format, which aims to overcome some limitations of the original proposal.

Changes

First modification is including full BIP-32 path of the exported node, so wallet can check whether the provided key was exported from expected part of the deterministic hierarchy.

Second modification is removal of fingerprint field, which was barely used by wallets and introduces unnecessary extra computation steps during serialization of the key. Sometimes it is even not possible to compute the fingerprint at all (when the parent key is unknown).

Last modification is the change from Base58 encoding to Bech32 encoding, which is more efficient in many areas.

Serialization format

Extended public and private keys are serialized as follows:

  • 1 byte: depth: 0x00 for master nodes, 0x01 for level-1 derived keys, ...
  • 4 * depth bytes: serialized BIP-32 path; each entry is encoded as 32-bit unsigned integer, most significant byte first
  • 32 bytes: the chain code
  • 33 bytes: the public key or private key data (serP(K) for public keys, 0x00 || ser256(k) for private keys)

This structure is encoded using Bech32 format described in BIP-0173. We will use 'xpub' human-readable part for extended public keys and 'xprv' for extended private keys.

Test vectors

mnemonic = abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon abandon about

m :

legacy_bip32_xprv = xprv9s21ZrQH143K3GJpoapnV8SFfukcVBSfeCficPSGfubmSFDxo1kuHnLisriDvSnRRuL2Qrg5ggqHKNVpxR86QEC8w35uxmGoggxtQTPvfUu
legacy_bip32_xpub = xpub661MyMwAqRbcFkPHucMnrGNzDwb6teAX1RbKQmqtEF8kK3Z7LZ59qafCjB9eCRLiTVG3uxBxgKvRgbubRhqSKXnGGb1aoaqLrpMBDrVxga8

slip32_prv_hex    = 007923408dadd3c7b56eed15567707ae5e5dca089de972e07f3b860450e2a3b70e001837c1be8e2995ec11cda2b066151be2cfb48adf9e47b151d46adab3a21cdf67
slip32_pub_hex    = 007923408dadd3c7b56eed15567707ae5e5dca089de972e07f3b860450e2a3b70e03d902f35f560e0470c63313c7369168d9d7df2d49bf295fd9fb7cb109ccee0494

slip32_prv_bech32 = xprv1qpujxsyd4hfu0dtwa524vac84e09mjsgnh5h9crl8wrqg58z5wmsuqqcxlqmar3fjhkprndzkpnp2xlze76g4hu7g7c4r4r2m2e6y8xlvu566tn6
slip32_pub_bech32 = xpub1qpujxsyd4hfu0dtwa524vac84e09mjsgnh5h9crl8wrqg58z5wmsuq7eqte474swq3cvvvcncumfz6xe6l0j6jdl990an7mukyyuemsyjszuwypl

m/0 :

legacy_bip32_xprv = xprv9ukW2UsmeQP9NB14w61cimzwEKbUJxHCypMb1PpEafjCETz69a6tp8aYdMkHfz6U49Ut262f9MpGZkCna1zDhEfW2BGkSehvrxd5ueR4TBe
legacy_bip32_xpub = xpub68jrRzQfUmwSaf5Y37Yd5uwfnMRxiR14M3HBonDr91GB7GKEh7R9Mvu2UeCtbASfXZ9FdNo9FwFx6a37HNXUDiXVQFXuadXmevRBa3y7rL8

slip32_prv_hex    = 0100000000e0e6503ac057cf5dc76e0735e56dd44d193b2e9e271cc2d46bc759c99b021e3c00baa89a8bdd61c5e22b9f10601d8791c9f8fc4b2fa6df9d68d336f0eb03b06eb6
slip32_pub_hex    = 0100000000e0e6503ac057cf5dc76e0735e56dd44d193b2e9e271cc2d46bc759c99b021e3c0376bf533d4b15510fa9f4124b6e48616f07debcf2ef0cfb185cdc4a576450b475

slip32_prv_bech32 = xprv1qyqqqqqqurn9qwkq2l84m3mwqu672mw5f5vnkt57yuwv94rtcavunxczrc7qpw4gn29a6cw9ug4e7yrqrkrerj0cl39jlfkln45dxdhsavpmqm4krfqykk
slip32_pub_bech32 = xpub1qyqqqqqqurn9qwkq2l84m3mwqu672mw5f5vnkt57yuwv94rtcavunxczrc7qxa4l2v75k923p75lgyjtdeyxzmc8m6709mcvlvv9ehz22aj9pdr4m6lwmk

m/1 :

legacy_bip32_xprv = xprv9ukW2UsmeQP9PQFT4K5ZcUPAXZy7hZPqMAX94Q2rTNA5qRznspNy8q87j3hc5eWWS7hS7sGVpEiGbMHLqxubZFqAASWSBuyVDqE9jxqjD9E
legacy_bip32_xpub = xpub68jrRzQfUmwSbtKvALcZycKu5boc727giPSjrnSU1hh4iEKwRMhDgdSbaK3Ac8hngo2Fgbz9B5S4V1jbkR8ffjFLjTBWSvALDZPzTLqeMqb

slip32_prv_hex    = 01000000015c48917d6838b666aeb11eac7c4f98f807779b57c7522e38509719eeb1e7a59200c1beaff0c4db984670a40c69c2947b9d33cd7f6e749c67e1fcb5c6118dda1282
slip32_pub_hex    = 01000000015c48917d6838b666aeb11eac7c4f98f807779b57c7522e38509719eeb1e7a59202ea2649b3512b9a859ab658a85e2989a7ae39b2518877b2dc0f2b44b785d5788d

slip32_prv_bech32 = xprv1qyqqqqqpt3yfzltg8zmxdt43r6k8cnuclqrh0x6hcafzuwzsjuv7av085kfqpsd74lcvfkucgec2grrfc228h8fne4lkuayuvlsledwxzxxa5y5zefalyg
slip32_pub_bech32 = xpub1qyqqqqqpt3yfzltg8zmxdt43r6k8cnuclqrh0x6hcafzuwzsjuv7av085kfq963xfxe4z2u6skdtvk9gtc5cnfaw8xe9rzrhktwq726yk7za27ydw88adn

m/0' :

legacy_bip32_xprv = xprv9ukW2Usuz4v7Yd2EC4vNXaMckdsEdgBA9n7MQbqMJbW9FuHDWWjDwzEM2h6XmFnrzX7JVmfcNWMEVoRauU6hQpbokqPPNTbdycW9fHSPYyF
legacy_bip32_xpub = xpub68jrRzQopSUQm76hJ6TNtiJMJfhj38u1X12xCzExrw388hcN443UVnYpswdUkV7vPJ3KayiCdp3Q5E23s4wvkucohVTh7eSstJdBFyn2DMx

slip32_prv_hex    = 0180000000f1c03f5ff97108912fd56761d3fada8879e4173aba45f10da4bbd94b1c49716000c08cf331996482c06db3d259ff99be4bf7083824d53185e33191ee7ceb2bf96f
slip32_pub_hex    = 0180000000f1c03f5ff97108912fd56761d3fada8879e4173aba45f10da4bbd94b1c497160027f1d87730e460e921b382242911565bf93daf2081ed685b2edd1d01176b2c13c

slip32_prv_bech32 = xprv1qxqqqqqq78qr7hlewyyfzt74vasa87k63pu7g9e6hfzlzrdyh0v5k8zfw9sqpsyv7vcejeyzcpkm85jel7vmujlhpquzf4f3sh3nry0w0n4jh7t0jhc039
slip32_pub_bech32 = xpub1qxqqqqqq78qr7hlewyyfzt74vasa87k63pu7g9e6hfzlzrdyh0v5k8zfw9sqylcasaesu3swjgdnsgjzjy2kt0unmteqs8kkskewm5wsz9mt9sfuvlxj6p

m/1' :

legacy_bip32_xprv = xprv9ukW2Usuz4v7ZSQ9zPsP7jQkeP7MtjLzyyb9zfZ7uZc7Hr1Kf1FKQq1tM8edPHeB2fPBATtH7XYNAEmxtCWRNvP5qZkv4E3CXL3FvwPsBSm
legacy_bip32_xpub = xpub68jrRzQopSUQmvUd6RQPUsMVCQwrJC4rMCWko3xjTu96AeLUCYZZxdLNCSXBA3QhaZJ67AynQNCtfcBFemxfjzWHWLKbkVCFyHGjFHHgqeE

slip32_prv_hex    = 018000000143cc4bca59c666a5f79265148125802ed2cec46df1c5ca8e6a058dab525a73f1003ef02fc53000742891fc90458ba9edc8363d8f1f267e326b1078710c7db34de5
slip32_pub_hex    = 018000000143cc4bca59c666a5f79265148125802ed2cec46df1c5ca8e6a058dab525a73f103b5184a526dac6abda3d8d54a541471ce83e8c2260d56706053e2780922319f5e

slip32_prv_bech32 = xprv1qxqqqqqpg0xyhjjecen2taujv52gzfvq9mfva3rd78zu4rn2qkx6k5j6w0csq0hs9lznqqr59zgleyz93w57mjpk8k837fn7xf43q7r3p37mxn095hysnx
slip32_pub_bech32 = xpub1qxqqqqqpg0xyhjjecen2taujv52gzfvq9mfva3rd78zu4rn2qkx6k5j6w0cs8dgcfffxmtr2hk3a34222s28rn5rarpzvr2kwps98cncpy3rr867k5u83k

m/44'/0'/0' :

legacy_bip32_xprv = xprv9xpXFhFpqdQK3TmytPBqXtGSwS3DLjojFhTGht8gwAAii8py5X6pxeBnQ6ehJiyJ6nDjWGJfZ95WxByFXVkDxHXrqu53WCRGypk2ttuqncb
legacy_bip32_xpub = xpub6BosfCnifzxcFwrSzQiqu2DBVTshkCXacvNsWGYJVVhhawA7d4R5WSWGFNbi8Aw6ZRc1brxMyWMzG3DSSSSoekkudhUd9yLb6qx39T9nMdj

slip32_prv_hex    = 038000002c80000000800000003da4bc190a2680111d31fadfdc905f2a7f6ce77c6f109919116f253d4344521900fe64af825b5b78554c33a28b23085fc082f691b3c712cc1d4e66e133297da87a
slip32_pub_hex    = 038000002c80000000800000003da4bc190a2680111d31fadfdc905f2a7f6ce77c6f109919116f253d4344521903774c910fcf07fa96886ea794f0d5caed9afe30b44b83f7e213bb92930e7df4bd

slip32_prv_bech32 = xprv1qwqqqqpvsqqqqqyqqqqqq0dyhsvs5f5qzywnr7klmjg972nldnnhcmcsnyv3zme984p5g5seqrlxftuztddhs42vxw3gkgcgtlqg9a53k0r39nqafenwzvef0k585enml6g
slip32_pub_bech32 = xpub1qwqqqqpvsqqqqqyqqqqqq0dyhsvs5f5qzywnr7klmjg972nldnnhcmcsnyv3zme984p5g5seqdm5eyg0eurl495gd6nefux4etke4l3sk39c8alzzwae9ycw0h6t6ltmssr

m/44'/0'/1' :

legacy_bip32_xprv = xprv9xpXFhFpqdQK5owUStFsuAiWUxYpLkvQn1QmVDumBKTvmmjkNEZgpMYoAaAftt3JVeDhRkvyLvrKathDToUMdz2FqRF7JNavF7uboJWArrw
legacy_bip32_xpub = xpub6BosfCnifzxcJJ1wYuntGJfF2zPJkDeG9ELNHcKNjezuea4tumswN9sH1psMdSVqCMoJC21Bv8usSeqSP4Sp1tLzW7aY59fGn9GCYzx5UTo

slip32_prv_hex    = 038000002c80000000800000012971fa2db0ff5d69e166a406813aa3d9ed09c4adac2e0ce33523da8c5609f4f4008855dfda37fe663bffc0136618504e3cbd7d992134609cef6191c729339d5c65
slip32_pub_hex    = 038000002c80000000800000012971fa2db0ff5d69e166a406813aa3d9ed09c4adac2e0ce33523da8c5609f4f4025d0261853d4c3a379160fb51d2f262ac64e65219139982c4e2180bcef1a233d9

slip32_prv_bech32 = xprv1qwqqqqpvsqqqqqyqqqqqz2t3lgkmpl6ad8skdfqxsya28k0dp8z2mtpwpn3n2g7633tqna85qzy9th76xllxvwllcqfkvxzsfc7t6lveyy6xp880vxguw2fnn4wx2mhtjy8
slip32_pub_bech32 = xpub1qwqqqqpvsqqqqqyqqqqqz2t3lgkmpl6ad8skdfqxsya28k0dp8z2mtpwpn3n2g7633tqna85qfwsycv984xr5du3vra4r5hjv2kxfejjryfenqkyugvqhnh35geajlgxhp0

m/44'/2'/0' :

legacy_bip32_xprv = Ltpv7735AbcbmL1gbgDWj2ezvs59rh4RM1oTN2BKTKbfe3146FCPCNFbBBSWfuV9vCJNMXD9LuHpQnqVWpn2hbMhikqPdoGqbS3ptdPoNWEvvgR
legacy_bip32_xpub = Ltub2YDQmP391UYeDYvLye9P1SuNJFkcRGN7SYHM8JMxaDnegcPTXHJ2BnYmvHnFnGPGKu2WMuCga6iZV3SDxDMGrRyMcrYEfSPhrpS1EPkC43E

slip32_prv_hex    = 038000002c8000000280000000869c5045e5fc789646babcd1961b101bc31e75fe50df8a585c79b05dca0ac75800983cd10d8d14160b10b9a4bb63207e9585054a3133619d57b78ea9d5aa3046d2
slip32_pub_hex    = 038000002c8000000280000000869c5045e5fc789646babcd1961b101bc31e75fe50df8a585c79b05dca0ac7580340fe3b8e89165258bac0cb711613c618d1af63dc321a90b751d0697301441bcc

slip32_prv_bech32 = xprv1qwqqqqpvsqqqqq5qqqqqpp5u2pz7tlrcjert40x3jcd3qx7rre6lu5xl3fv9c7dsth9q436cqzvre5gd352pvzcshxjtkceq062c2p22xyekr82hk782n4d2xprdysp4gxc
slip32_pub_bech32 = xpub1qwqqqqpvsqqqqq5qqqqqpp5u2pz7tlrcjert40x3jcd3qx7rre6lu5xl3fv9c7dsth9q436cqdq0uwuw3yt9yk96cr9hz9snccvdrtmrmsep4y9h28gxjucpgsducuj4f9r

m/49'/0'/0' :

legacy_bip32_xprv = yprvAHwhK6RbpuS3dgCYHM5jc2ZvEKd7Bi61u9FVhYMpgMSuZS613T1xxQeKTffhrHY79hZ5PsskBjcc6C2V7DrnsMsNaGDaWev3GLRQRgV7hxF
legacy_bip32_xpub = ypub6Ww3ibxVfGzLrAH1PNcjyAWenMTbbAosGNB6VvmSEgytSER9azLDWCxoJwW7Ke7icmizBMXrzBx9979FfaHxHcrArf3zbeJJJUZPf663zsP

slip32_prv_hex    = 038000003180000000800000006eaae365ae0e0a0aab84325cfe7cd76c3b909035f889e7d3f1b847a9a0797ecb00880d51752bda4190607e079588d3f644d96bfa03446bce93cddfda3c4a99c7e6
slip32_pub_hex    = 038000003180000000800000006eaae365ae0e0a0aab84325cfe7cd76c3b909035f889e7d3f1b847a9a0797ecb02f1f347891b20f7568eae3ec9869fbfb67bcab6f358326f10ecc42356bd55939d

slip32_prv_bech32 = xprv1qwqqqqp3sqqqqqyqqqqqqm42udj6urs2p24cgvjule7dwmpmjzgrt7yfulflrwz84xs8jlktqzyq65t490dyryrq0cretzxn7ezdj6l6qdzxhn5neh0a50z2n8r7vumvllf
slip32_pub_bech32 = xpub1qwqqqqp3sqqqqqyqqqqqqm42udj6urs2p24cgvjule7dwmpmjzgrt7yfulflrwz84xs8jlktqtclx3ufrvs0w45w4clvnp5lh7m8hj4k7dvrymcsanzzx44a2kfe6xynfgh

m/49'/2'/0' :

legacy_bip32_xprv = Mtpv7RooeEQDUitupgpJcxZnfDwvq8hC24R7GAiscrqFhHHhit96vCNY7yudJgrM841dMbiRUQceC12566XAHHC8Rd1BtnBdokq9tmF7jLLvUdh
legacy_bip32_xpub = Mtub2rz9F1pkisRsSZX8sa4Ajon9GhPP6JymLgpuHqbYdU5JKFLBF7Qy8b1tZ3dccj2fefrAxfrPdVkpCxuWn3g72UctH2bvJRkp6iFmp8aLeRZ

slip32_prv_hex    = 0380000031800000028000000067b7e1dc5c70a93504218ccf40c47ad46d4a9c858196376ce0e853aca7be049800cf222cc2e097049fe2ca76626c19c7e7a3ef971b1f64195758ab3c832463fcf4
slip32_pub_hex    = 0380000031800000028000000067b7e1dc5c70a93504218ccf40c47ad46d4a9c858196376ce0e853aca7be049802b07388bd2edaba3c0a2c0856716fd7c9965d212fb2736f7b925f57d922b10ace

slip32_prv_bech32 = xprv1qwqqqqp3sqqqqq5qqqqqqeahu8w9cu9fx5zzrrx0grz844rdf2wgtqvkxakwp6zn4jnmupycqr8jytxzuztsf8lzefmxymqecln68muhrv0kgx2htz4neqeyv070gg6dcn7
slip32_pub_bech32 = xpub1qwqqqqp3sqqqqq5qqqqqqeahu8w9cu9fx5zzrrx0grz844rdf2wgtqvkxakwp6zn4jnmupycq2c88z9a9mdt50q29sy9vut06lyevhfp97e8xmmmjf040kfzky9vu2pu92u

m/84'/0'/0' :

legacy_bip32_xprv = zprvAdG4iTXWBoARxkkzNpNh8r6Qag3irQB8PzEMkAFeTRXxHpbF9z4QgEvBRmfvqWvGp42t42nvgGpNgYSJA9iefm1yYNZKEm7z6qUWCroSQnE
legacy_bip32_xpub = zpub6rFR7y4Q2AijBEqTUquhVz398htDFrtymD9xYYfG1m4wAcvPhXNfE3EfH1r1ADqtfSdVCToUG868RvUUkgDKf31mGDtKsAYz2oz2AGutZYs

slip32_prv_hex    = 038000005480000000800000004a53a0ab21b9dc95869c4e92a161194e03c0ef3ff5014ac692f433c4765490fc00e14f274d16ca0d91031b98b162618061d03930fa381af6d4caf44b01819ab6d4
slip32_pub_hex    = 038000005480000000800000004a53a0ab21b9dc95869c4e92a161194e03c0ef3ff5014ac692f433c4765490fc02707a62fdacc26ea9b63b1c197906f56ee0180d0bcf1966e1a2da34f5f3a09a9b

slip32_prv_bech32 = xprv1qwqqqqz5sqqqqqyqqqqqqjjn5z4jrwwujkrfcn5j59s3jnsrcrhnlagpftrf9apnc3m9fy8uqrs57f6dzm9qmygrrwvtzcnpspsaqwfslgup4ak5et6ykqvpn2mdggeaxrp
slip32_pub_bech32 = xpub1qwqqqqz5sqqqqqyqqqqqqjjn5z4jrwwujkrfcn5j59s3jnsrcrhnlagpftrf9apnc3m9fy8uqfc85cha4npxa2dk8vwpj7gx74hwqxqdp083jehp5tdrfa0n5zdfkg3lp00

References