今までの試行、コメント、MasteringBitcoin読書により断片的な知識は得た。これで何とか総支払額を算出できないか考えてみた。

MasteringBitcoin日本語訳を読む（Script言語）

272ページ中126〜129ページ。

前回まで

目的

取引データが支払か受取か判別する方法を知りたくて読む。

前回

vinのscriptSigをどうにかすれば自分が支払う取引か否かを判定できそう。でもそのためには秘密鍵が必要らしくJavaScriptで実行するにはセキュリティ的に危険。

scriptSigを入力にしてscriptPubKeyにあるscriptを実行することで本人確認できると思われる。が、そもそもScript言語のコンパイラがJavaScript上に存在しないはず。

どのみちscriptを使って支払・受取の判別はできないのでは？　なら一体どうすれば判別できるの？

これまでの教えから推測する

おそらくscript実行には専用コンパイラが必要で、それはローカル環境でしか作れない。その環境を作ったサーバを用意してローカルで判定するか、REST APIとして公開するようなことはできるかもしれない。あるいはすでにそういうサービスがあるかもしれない。

ブロックチェーン・エクスプローラがそれかもしれない。ブロックチェーン・エクスプローラのことは以前コメントでも教えていただいたし、あとで読んだMasteringBitcoinの中でも見かけた。

Counterparty や Counterblock は、セカンドレイヤ・チェーン (Counterparty やモナパーティ)のために存在します。 ファーストレイヤー (Bitcoin やモナコイン) の情報は一部しか提供しません。仰る「手数料」がモナコインの採掘手数料を指すなら、モナコインを対象とするブロックチェーン・エクスプローラを利用する必要があります。たとえば https://blockbook.electrum-mona.org/ です。API の使い方は GitHub にあります。https://github.com/trezor/blockbook/blob/master/docs/api.md#get-transaction

コメントで教わったURL先のREADMEを読んでみる。ブロックハッシュというのはMasteringBitcoinでいうブロックヘッダと関係あるのだろうか。これと秘密鍵を使い、なんやかんや計算し、vinのscriptSigだかvoutのscriptPubKeyだかと一致すれば本人が支払う取引データであると判断できるとか？

あるいは指定アドレスの全トランザクションを取得し、そこからuxto（未使用アウトプット）を取得するAPIを使ってその要素を抜けば、残ったものが支払いトランザクションなのでは？　その和が総支払額になるのでは？

この路線で調査してみよう。

GET /api/v1/utxo/{address}

GET /api/v1/utxo/{address}

とりあえず私のアドレスを渡してuxtoを取得してみる。

https://blockbook.electrum-mona.org/api/v1/utxo/MEHCqJbgiNERCH3bRAtNSSD9uxPViEX1nu

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おそらくuxtoがもつamountの和が「残高」になると思われる。

なら、全トランザクションからその要素を抜けば、残ったものが支払った取引データになるはず。

指定アドレスの支払い取引要素
＝指定アドレスの全トランザクション要素−指定アドレスの未使用アウトプット要素

指定アドレスの全トランザクション取得は以下の方法。search_raw_transactions APIを使う。

問題は、どうやってuxtoと全トランザクション情報を一致判定させるか。txidが識別子っぽいので、それで一致判定させるのだろう。でも、全トランザクション情報の中でtxidを持っているのはvinのみ。vinは入力であり、もし自分が受け取る側の取引だったらvinには支払う相手側のtxidが入っている。私のではない。voutのおつり側ではないほうが私のuxtoになるはず。でも、voutのほうにtxidは書いてない。なら、一体どうやってuxtoと全トランザクション中にある要素が同じ要素であると判定すればいいの？　わからない。

一応、アドレスと金額なら一致するだろうが、それと同じ要素は他にもたくさんある。せめてタイムスタンプがあればよかったのだが、uxto側にはタイムスタンプがない。

GET /api/v2/utxo/{address|xpub|descriptor}

v2のutxoをみても戻り値に大差ない。amoutがvalueになって、わかりにくくなったくらいか。

https://blockbook.electrum-mona.org/api/v2/utxo/MEHCqJbgiNERCH3bRAtNSSD9uxPViEX1nu

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"11431500","height":2672739,"confirmations":37106},{"txid":"e55d76e30e2b59d589cbf056baa0d6be4ce900bb6a7b59426f39eff715689665","vout":0,"value":"11411400","height":2672369,"confirmations":37476},{"txid":"c0ea3a09660da2f270f5ecca695caa0ff4047f9c2a7dec2d5222eb10c56337e9","vout":0,"value":"11400000","height":2672368,"confirmations":37477},{"txid":"131f491bebef29fa4a9545ea894552bb302065dfadc405752c6f31142e5cad02","vout":0,"value":"11411400","height":2672368,"confirmations":37477},{"txid":"4e490864c0b975cc9c504adcec03bd1ecb793c3b0559b5ae1fc37e7af014b17a","vout":0,"value":"11431500","height":2672294,"confirmations":37551},{"txid":"91c8765e1b745420d288f9064b659aaadcb08d0ec9f0d05fab195f71e23b41cc","vout":0,"value":"1141140","height":2672293,"confirmations":37552},{"txid":"c15d93a315941c21a81d50a8fedbbf1fb0aae50217b1659b31039af3d6ae1f31","vout":0,"value":"1141140","height":2671389,"confirmations":38456},{"txid":"f78a61b91269bd8b16993f6f3d49c5ae23ed11b2376b3b394ae6a525308798bb","vout":0,"value":"11431500","height":2671389,"confirmations":38456},{"txid":"0524ae5c8415e4893c57604e5950c88553da673bcb6d8fd9dea2a5fd0eb7041b","vout":0,"value":"39390000","height":2670703,"confirmations":39142},{"txid":"bcad39c53288d19870b6ecb156cb89786c9576a1786b1d0d7e26338c56f81635","vout":0,"value":"1141140","height":2669573,"confirmations":40272},{"txid":"87236c5ba27d094ada5b110fdbd8513cf266cb4d442d7bb55bb7845a8e06388c","vout":0,"value":"1141140","height":2669006,"confirmations":40839},{"txid":"f30f6aa525b5e8e49d1cf06a30b1696c1ed7aa60e35f9ed60840db3e64f78a5f","vout":0,"value":"11431500","height":2668966,"confirmations":40879},{"txid":"4de2f455ec1c40f0962abf3d35cf8902d82f5a0e94170b882127578cda3bd26b","vout":0,"value":"1141140","height":2668966,"confirmations":40879},{"txid":"43e2a380e0f1a66f7dce9d3c62ca004bbe312b2e05f5b8f832f3c43598dd4d55","vout":0,"value":"1143150","height":2668482,"confirmations":41363},{"txid":"f8c62ce8de3ec286d988499621f78d0aa4191d50e84eea7bdc7e4f3d4c365923","vout":0,"value":"11411400","height":2666378,"confirmations":43467},{"txid":"8f50c7f4c35fbd77a0ae669baf5f1d4fa69d04e34b3f777630d69156938c7f2c","vout":0,"value":"1141140","height":2666062,"confirmations":43783},{"txid":"4b0a9eeda48a03c3c09caee4f3608784669f87d9d475aaecc8c0a9d98da48c66","vout":1,"value":"94109500","height":2666003,"confirmations":43842},{"txid":"831c41287d17e58b7d566d875c203751e89c2c272cdfe8ad884ca848811c412c","vout":0,"value":"11431500","height":2665901,"confirmations":43944},{"txid":"9004fe5012c3bc067b48147dc5e03ece0bd1c92032be3b42823597ecb090dc63","vout":0,"value":"1141140","height":2665901,"confirmations":43944},{"txid":"35c204ccb2709bc0eb15a736991f020d45c8f20222ce5462207deb7b268cf752","vout":1,"value":"84107250","height":2665230,"confirmations":44615},{"txid":"f48ba7e92f964a0f25bc2cbd0d025be5ecf6c4ed27ead3ffb453c3b0451fa2f3","vout":1,"value":"84107250","height":2665230,"confirmations":44615},{"txid":"f361755e992a137104045aab29a3c8aa5a5b1728f3da1f0c14d6bc535d67aa5e","vout":0,"value":"1141140","height":2665158,"confirmations":44687}]

GET /api/v2/tx/{txid}

上記uxtoで最初の要素のtxidを渡してみる。Ask Mona 3.0で0.0222 MONA受け取ったときのもの。Ask monaには以下のようなリンクがあった。URL末尾の値は、上記uxtoで取得された最初の要素のtxidと一致する。

https://blockbook.electrum-mona.org/tx/394eabd9532a09793adf03f229effc88c55185dba59b6fce53559013ba377146

READMEをみてAPI用URLを作ると以下。

https://blockbook.electrum-mona.org/api/v2/tx/394eabd9532a09793adf03f229effc88c55185dba59b6fce53559013ba377146

その結果が以下。

{"txid":"394eabd9532a09793adf03f229effc88c55185dba59b6fce53559013ba377146","version":1,"vin":[{"txid":"13faaf3729365fc75f6817aecf1967b3bc7c568a0026dbbf4b6818bb8c61b745","vout":1,"sequence":4294967295,"n":0,"addresses":["MVaW396wLPpocjUBiw939wbyvgg5g9D7D5"],"isAddress":true,"value":"473532330","hex":"483045022100a0bab345668fcade4622cb8e739a128081fcf62a8281f6b615786bdf35ca4da0022038d9019add3cd461023bf706c67ee0692aefa22a829b0e29650f7c13664232a8012102d4cb384ff895f4e669a9e228777afb473030682a309bd4e499f85817cf3b73c0"}],"vout":[{"value":"2220000","n":0,"hex":"76a91445fc13c9d3a0df34008291492c39e0efcdd220b888ac","addresses":["MEHCqJbgiNERCH3bRAtNSSD9uxPViEX1nu"],"isAddress":true},{"value":"471289605","n":1,"spent":true,"hex":"76a914edcb658a665e51e7a5ed93f26f3512311625aae088ac","addresses":["MVaW396wLPpocjUBiw939wbyvgg5g9D7D5"],"isAddress":true}],"blockHash":"3bda3a70f404e96014f3e0e364063f11fc77512de0356513bc6f03a0391b9b84","blockHeight":2709785,"confirmations":62,"blockTime":1657064015,"value":"473509605","valueIn":"473532330","fees":"22725","hex":"010000000145b7618cbb18684bbfdb26008a567cbcb36719cfae17685fc75f362937affa13010000006b483045022100a0bab345668fcade4622cb8e739a128081fcf62a8281f6b615786bdf35ca4da0022038d9019add3cd461023bf706c67ee0692aefa22a829b0e29650f7c13664232a8012102d4cb384ff895f4e669a9e228777afb473030682a309bd4e499f85817cf3b73c0ffffffff02e0df2100000000001976a91445fc13c9d3a0df34008291492c39e0efcdd220b888ac054f171c000000001976a914edcb658a665e51e7a5ed93f26f3512311625aae088ac00000000"}

おや？　このAPIはsearch_raw_transactions APIと違い、vinにアドレスが入っているぞ？　これなら支払いが自分かどうか判断できる！　ついでにtxidからトランザクション情報を取得するAPIを探す　追記で教わったとおり手数料feesも判明する！

でも、そもそもこのtxidはuxto APIから取得しており、それは自分のアドレスの未使用アウトプット。つまり自分が受け取ったトランザクションであるということ。なので、そのtxidから得たトランザクションのvinは必ず相手のアドレスになっていると分かりきっている。

なら、search_raw_transactions APIのvinにあるtxidすべてに対して今回のGET /api/v2/tx/{txid}をかけ、そのvinが自分のアドレスなら支払い、そうでないなら受け取りと判定できるのでは？

これか！　これっぽいぞ。この方法なら取引データが支払か受取かを判別できるに違いない。試してみよう。

search_raw_transactions＋GET /api/v2/tx/{txid}

私のアドレスの全取引データをsearch_raw_transactionsAPIで取得する。このうち記念すべき最初の取引である配列要素[0]は、私がモナレッジでその作者らいう様から受け取ったときのデータと思われる。

[0]

{
    "blockhash": "b25e87ea736c39df3a51c032aefc558f0f6851a602cc57d21b3cb38fc3ec465f",
    "blocktime": 1652234061,
    "confirmations": 51093,
    "hash": "483aa8414711bb71246f355240cb4a79a5292d8b7b152caca8c985b0c6e6acd0",
    "height": 2658711,
    "hex": "010000000103804fe9ad11c4485fbdc3b025dd68a6c99ae7ccd19b9d63e641f5b6e24be9e1010000006b483045022100b18c83115da395e12791b717b32aff754865cac478bb4e72ddde0f0e6c28b28d0220716c20fcd5151e4aeb8c2f898b9735713a596ff8daac03d7169e207c2e4e6743012103aedd2422519c7ea14e48116b571903c16d2b4657d4a3ffc0e35646cd7e53be3dffffffff02d03dcd06000000001976a91445fc13c9d3a0df34008291492c39e0efcdd220b888ac6a4d1606000000001976a91413bd7f2032c935652371722ae6d987f2f8135aac88ac00000000",
    "locktime": 0,
    "size": 226,
    "time": 1652234061,
    "txid": "483aa8414711bb71246f355240cb4a79a5292d8b7b152caca8c985b0c6e6acd0",
    "version": 1,
    "vin": [
        {
            "scriptSig": {
                "asm": "3045022100b18c83115da395e12791b717b32aff754865cac478bb4e72ddde0f0e6c28b28d0220716c20fcd5151e4aeb8c2f898b9735713a596ff8daac03d7169e207c2e4e6743[ALL] 03aedd2422519c7ea14e48116b571903c16d2b4657d4a3ffc0e35646cd7e53be3d",
                "hex": "483045022100b18c83115da395e12791b717b32aff754865cac478bb4e72ddde0f0e6c28b28d0220716c20fcd5151e4aeb8c2f898b9735713a596ff8daac03d7169e207c2e4e6743012103aedd2422519c7ea14e48116b571903c16d2b4657d4a3ffc0e35646cd7e53be3d"
            },
            "sequence": 4294967295,
            "txid": "e1e94be2b6f541e6639d9bd1cce79ac9a668dd25b0c3bd5f48c411ade94f8003",
            "vout": 1
        }
    ],
    "vout": [
        {
            "n": 0,
            "scriptPubKey": {
                "addresses": [
                    "MEHCqJbgiNERCH3bRAtNSSD9uxPViEX1nu"
                ],
                "asm": "OP_DUP OP_HASH160 45fc13c9d3a0df34008291492c39e0efcdd220b8 OP_EQUALVERIFY OP_CHECKSIG",
                "hex": "76a91445fc13c9d3a0df34008291492c39e0efcdd220b888ac",
                "reqSigs": 1,
                "type": "pubkeyhash"
            },
            "value": 1.14114
        },
        {
            "n": 1,
            "scriptPubKey": {
                "addresses": [
                    "M9hY5XcC7MSD54DfqcEojiKm9QMgXeQhGK"
                ],
                "asm": "OP_DUP OP_HASH160 13bd7f2032c935652371722ae6d987f2f8135aac OP_EQUALVERIFY OP_CHECKSIG",
                "hex": "76a91413bd7f2032c935652371722ae6d987f2f8135aac88ac",
                "reqSigs": 1,
                "type": "pubkeyhash"
            },
            "value": 1.02124906
        }
    ],
    "vsize": 226,
    "weight": 904
}

このときvinにはtxidがある。これは私に支払った相手が所有するコインを含んだ取引データを指す識別子のはず。

  • e1e94be2b6f541e6639d9bd1cce79ac9a668dd25b0c3bd5f48c411ade94f8003

このtxidをGET /api/v2/tx/{txid}に渡してみる。もしその結果のvinの中に、自分ではないアドレスがあれば、相手が支払い、私が受け取ったときの取引だと判断できるはず。

https://blockbook.electrum-mona.org/api/v2/tx/e1e94be2b6f541e6639d9bd1cce79ac9a668dd25b0c3bd5f48c411ade94f8003

{"txid":"e1e94be2b6f541e6639d9bd1cce79ac9a668dd25b0c3bd5f48c411ade94f8003","version":1,"vin":[{"txid":"7b628af7e435d9e0b14116b11c346d6f3bbe2510c0cabd8fb5d01af68359b219","vout":1,"sequence":4294967295,"n":0,"addresses":["M9hY5XcC7MSD54DfqcEojiKm9QMgXeQhGK"],"isAddress":true,"value":"255284356","hex":"483045022100e7b36a5115a86326b91d0bf89407df78733850c63e041a51a913f3f09f6df13e022048896aaa5b71ababf66323b8bc8ed25e1b3a423ed643b5a7acf484dcf4f3afbf012103aedd2422519c7ea14e48116b571903c16d2b4657d4a3ffc0e35646cd7e53be3d"}],"vout":[{"value":"39000000","n":0,"hex":"76a9145bef72db1e9a105cf734ead06ef87a54f1d39a3588ac","addresses":["MGHGa55FH7CcaJdNqJZZb3YCPuZAn2iMUF"],"isAddress":true},{"value":"216261631","n":1,"spent":true,"hex":"76a91413bd7f2032c935652371722ae6d987f2f8135aac88ac","addresses":["M9hY5XcC7MSD54DfqcEojiKm9QMgXeQhGK"],"isAddress":true}],"blockHash":"f413585659148cdfc442975bb9bd9de8dddfafe2ccaad1fa3f394280988ae7b1","blockHeight":2633653,"confirmations":76208,"blockTime":1649863002,"value":"255261631","valueIn":"255284356","fees":"22725","hex":"010000000119b25983f61ad0b58fbdcac01025be3b6f6d341cb11641b1e0d935e4f78a627b010000006b483045022100e7b36a5115a86326b91d0bf89407df78733850c63e041a51a913f3f09f6df13e022048896aaa5b71ababf66323b8bc8ed25e1b3a423ed643b5a7acf484dcf4f3afbf012103aedd2422519c7ea14e48116b571903c16d2b4657d4a3ffc0e35646cd7e53be3dffffffff02c0175302000000001976a9145bef72db1e9a105cf734ead06ef87a54f1d39a3588acffe3e30c000000001976a91413bd7f2032c935652371722ae6d987f2f8135aac88ac00000000"}

vinの中にあるaddressesはM9hY5XcC7MSD54DfqcEojiKm9QMgXeQhGK。これはらいう様のアドレスと思われる。つまり、この取引の支払者は私ではないため、私は受け取り側だと判断できる！

ｷﾀ━━━━(ﾟ∀ﾟ)━━━━!!

まとめ

  1. search_raw_transactionsで自分のアドレスの全トランザクション情報を取得する
  2. 1のデータ1件ずつにGET /api/v2/tx/{txid}をかける
  3. 2のデータにあるvinのaddressesに自分のアドレスがあれば支払い、なければ受け取りと判断できる