251        return false;
252
253    std::vector<unsigned char> blockData(ParseHex(strHexBlk));
254    try {
255        SpanReader{blockData} >> TX_WITH_WITNESS(block);
256    }
257    catch (const std::exception&) {
258        return false;
259    }
260
261    return true;
262}
263
264util::Result<int> SighashFromStr(const std::string& sighash)
265{
266    static const std::map<std::string, int> map_sighash_values = {
267        {std::string("DEFAULT"), int(SIGHASH_DEFAULT)},
268        {std::string("ALL"), int(SIGHASH_ALL)},
269        {std::string("ALL|ANYONECANPAY"), int(SIGHASH_ALL|SIGHASH_ANYONECANPAY)},
270        {std::string("NONE"), int(SIGHASH_NONE)},
271        {std::string("NONE|ANYONECANPAY"), int(SIGHASH_NONE|SIGHASH_ANYONECANPAY)},
272        {std::string("SINGLE"), int(SIGHASH_SINGLE)},
273        {std::string("SINGLE|ANYONECANPAY"), int(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY)},
274    };
275    const auto& it = map_sighash_values.find(sighash);
276    if (it != map_sighash_values.end()) {
277        return it->second;
278    } else {
279        return util::Error{Untranslated("'" + sighash + "' is not a valid sighash parameter.")};
280    }
281}
282
283UniValue ValueFromAmount(const CAmount amount)
284{
285    static_assert(COIN > 1);
286    int64_t quotient = amount / COIN;
287    int64_t remainder = amount % COIN;
288    if (amount < 0) {
289        quotient = -quotient;
290        remainder = -remainder;
291    }
292    return UniValue(UniValue::VNUM,
293            strprintf("%s%d.%08d", amount < 0 ? "-" : "", quotient, remainder));
294}
295
296std::string FormatScript(const CScript& script)
297{
298    std::string ret;
299    CScript::const_iterator it = script.begin();
300    opcodetype op;
301    while (it != script.end()) {
302        CScript::const_iterator it2 = it;
303        std::vector<unsigned char> vch;
304        if (script.GetOp(it, op, vch)) {
305            if (op == OP_0) {
306                ret += "0 ";
307                continue;
308            } else if ((op >= OP_1 && op <= OP_16) || op == OP_1NEGATE) {
309                ret += strprintf("%i ", op - OP_1NEGATE - 1);
310                continue;
311            } else if (op >= OP_NOP && op <= OP_NOP10) {
312                std::string str(GetOpName(op));
313                if (str.substr(0, 3) == std::string("OP_")) {
314                    ret += str.substr(3, std::string::npos) + " ";
315                    continue;
316                }
317            }
318            if (vch.size() > 0) {
319                ret += strprintf("0x%x 0x%x ", HexStr(std::vector<uint8_t>(it2, it - vch.size())),
320                                               HexStr(std::vector<uint8_t>(it - vch.size(), it)));
321            } else {
322                ret += strprintf("0x%x ", HexStr(std::vector<uint8_t>(it2, it)));
323            }
324            continue;
325        }
326        ret += strprintf("0x%x ", HexStr(std::vector<uint8_t>(it2, script.end())));
327        break;
328    }
329    return ret.substr(0, ret.empty() ? ret.npos : ret.size() - 1);
330}
331
332const std::map<unsigned char, std::string> mapSigHashTypes = {
333    {static_cast<unsigned char>(SIGHASH_ALL), std::string("ALL")},
334    {static_cast<unsigned char>(SIGHASH_ALL|SIGHASH_ANYONECANPAY), std::string("ALL|ANYONECANPAY")},
335    {static_cast<unsigned char>(SIGHASH_NONE), std::string("NONE")},
336    {static_cast<unsigned char>(SIGHASH_NONE|SIGHASH_ANYONECANPAY), std::string("NONE|ANYONECANPAY")},
337    {static_cast<unsigned char>(SIGHASH_SINGLE), std::string("SINGLE")},
338    {static_cast<unsigned char>(SIGHASH_SINGLE|SIGHASH_ANYONECANPAY), std::string("SINGLE|ANYONECANPAY")},
339};
340
341std::string SighashToStr(int32_t sighash_type)
342{
343    // Signatures encode the sighash type in a single byte, but the PSBT field
344    // for it is a 32 bit unsigned integer in BIP 174 (signed in PSBTInput)
345    if (sighash_type < 0 || sighash_type > 0xff) return "";
346    const uint8_t sighash_byte(sighash_type);
347    const auto& it = mapSigHashTypes.find(sighash_byte);
348    if (it == mapSigHashTypes.end()) return "";
349    return it->second;
350}
351
352/**
353 * Create the assembly string representation of a CScript object.
354 * @param[in] script    CScript object to convert into the asm string representation.
355 * @param[in] fAttemptSighashDecode    Whether to attempt to decode sighash types on data within the script that matches the format
356 *                                     of a signature. Only pass true for scripts you believe could contain signatures. For example,
357 *                                     pass false, or omit the this argument (defaults to false), for scriptPubKeys.
358 */
359std::string ScriptToAsmStr(const CScript& script, const bool fAttemptSighashDecode)
360{
361    std::string str;
362    opcodetype opcode;
363    std::vector<unsigned char> vch;
364    CScript::const_iterator pc = script.begin();
365    while (pc < script.end()) {
366        if (!str.empty()) {
367            str += " ";
368        }
369        if (!script.GetOp(pc, opcode, vch)) {
370            str += "[error]";
371            return str;
372        }
373        if (0 <= opcode && opcode <= OP_PUSHDATA4) {
374            if (vch.size() <= static_cast<std::vector<unsigned char>::size_type>(4)) {
375                str += strprintf("%d", CScriptNum(vch, false).getint());
376            } else {
377                // the IsUnspendable check makes sure not to try to decode OP_RETURN data that may match the format of a signature
378                if (fAttemptSighashDecode && !script.IsUnspendable()) {
379                    std::string strSigHashDecode;
380                    // goal: only attempt to decode a defined sighash type from data that looks like a signature within a scriptSig.
381                    // this won't decode correctly formatted public keys in Pubkey or Multisig scripts due to
382                    // the restrictions on the pubkey formats (see IsCompressedOrUncompressedPubKey) being incongruous with the
383                    // checks in CheckSignatureEncoding.
384                    if (CheckSignatureEncoding(vch, SCRIPT_VERIFY_STRICTENC, nullptr)) {
385                        const unsigned char chSigHashType = vch.back();
386                        const auto it = mapSigHashTypes.find(chSigHashType);
387                        if (it != mapSigHashTypes.end()) {
388                            strSigHashDecode = "[" + it->second + "]";
389                            vch.pop_back(); // remove the sighash type byte. it will be replaced by the decode.
390                        }
391                    }
392                    str += HexStr(vch) + strSigHashDecode;
393                } else {
394                    str += HexStr(vch);
395                }
396            }
397        } else {
398            str += GetOpName(opcode);
399        }
400    }
401    return str;
402}
403
404std::string EncodeHexTx(const CTransaction& tx)
405{
406    DataStream ssTx;
407    ssTx << TX_WITH_WITNESS(tx);
408    return HexStr(ssTx);
409}
410
411void ScriptToUniv(const CScript& script, UniValue& out, bool include_hex, bool include_address, const SigningProvider* provider)
412{
413    CTxDestination address;
414
415    out.pushKV("asm", ScriptToAsmStr(script));
416    if (include_address) {
417        out.pushKV("desc", InferDescriptor(script, provider ? *provider : DUMMY_SIGNING_PROVIDER)->ToString());
418    }
419    if (include_hex) {
420        out.pushKV("hex", HexStr(script));
421    }
422
423    std::vector<std::vector<unsigned char>> solns;
424    const TxoutType type{Solver(script, solns)};
425
426    if (include_address && ExtractDestination(script, address) && type != TxoutType::PUBKEY) {
427        out.pushKV("address", EncodeDestination(address));
428    }
429    out.pushKV("type", GetTxnOutputType(type));
430}
431
432void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry, bool include_hex, const CTxUndo* txundo, TxVerbosity verbosity, std::function<bool(const CTxOut&)> is_change_func)
433{
434    CHECK_NONFATAL(verbosity >= TxVerbosity::SHOW_DETAILS);
435
436    entry.pushKV("txid", tx.GetHash().GetHex());
437    entry.pushKV("hash", tx.GetWitnessHash().GetHex());
438    entry.pushKV("version", tx.version);
439    entry.pushKV("size", tx.ComputeTotalSize());
440    entry.pushKV("vsize", (GetTransactionWeight(tx) + WITNESS_SCALE_FACTOR - 1) / WITNESS_SCALE_FACTOR);
441    entry.pushKV("weight", GetTransactionWeight(tx));
442    entry.pushKV("locktime", tx.nLockTime);
443
444    UniValue vin{UniValue::VARR};
445    vin.reserve(tx.vin.size());
446
447    // If available, use Undo data to calculate the fee. Note that txundo == nullptr
448    // for coinbase transactions and for transactions where undo data is unavailable.
449    const bool have_undo = txundo != nullptr;
450    CAmount amt_total_in = 0;
451    CAmount amt_total_out = 0;
452
453    for (unsigned int i = 0; i < tx.vin.size(); i++) {
454        const CTxIn& txin = tx.vin[i];
455        UniValue in(UniValue::VOBJ);
456        if (tx.IsCoinBase()) {
457            in.pushKV("coinbase", HexStr(txin.scriptSig));
458        } else {
459            in.pushKV("txid", txin.prevout.hash.GetHex());
460            in.pushKV("vout", txin.prevout.n);
461            UniValue o(UniValue::VOBJ);
462            o.pushKV("asm", ScriptToAsmStr(txin.scriptSig, true));
463            o.pushKV("hex", HexStr(txin.scriptSig));
464            in.pushKV("scriptSig", std::move(o));
465        }
466        if (!tx.vin[i].scriptWitness.IsNull()) {
467            UniValue txinwitness(UniValue::VARR);
468            txinwitness.reserve(tx.vin[i].scriptWitness.stack.size());
469            for (const auto& item : tx.vin[i].scriptWitness.stack) {
470                txinwitness.push_back(HexStr(item));
471            }
472            in.pushKV("txinwitness", std::move(txinwitness));
473        }
474        if (have_undo) {
475            const Coin& prev_coin = txundo->vprevout[i];
476            const CTxOut& prev_txout = prev_coin.out;
477
478            amt_total_in += prev_txout.nValue;
479
480            if (verbosity == TxVerbosity::SHOW_DETAILS_AND_PREVOUT) {
481                UniValue o_script_pub_key(UniValue::VOBJ);
482                ScriptToUniv(prev_txout.scriptPubKey, /*out=*/o_script_pub_key, /*include_hex=*/true, /*include_address=*/true);
483
484                UniValue p(UniValue::VOBJ);
485                p.pushKV("generated", prev_coin.IsCoinBase());
486                p.pushKV("height", prev_coin.nHeight);
487                p.pushKV("value", ValueFromAmount(prev_txout.nValue));
488                p.pushKV("scriptPubKey", std::move(o_script_pub_key));
489                in.pushKV("prevout", std::move(p));
490            }
491        }
492        in.pushKV("sequence", txin.nSequence);
493        vin.push_back(std::move(in));
494    }
495    entry.pushKV("vin", std::move(vin));
496
497    UniValue vout(UniValue::VARR);
498    vout.reserve(tx.vout.size());
499    for (unsigned int i = 0; i < tx.vout.size(); i++) {
500        const CTxOut& txout = tx.vout[i];