Here’s the data structure of a BTC transaction:
```json { "version": "01000000", // Transaction version number "inputcount": "02", // Number of inputs "inputs": [ // List of transaction inputs { "txid": "6059fa31ab283937854e8ba1128ae4572e7994af5b9e7a9450107f63a740dccc", "vout": "01000000", // Index of the output in the previous transaction "scriptsigsize": "6b", // Script providing necessary data to satisfy the scriptPubKey "scriptsig": "483045022100fed4209b8711a22e0d4a9e8b1d2c209b53180e89debbc13ea535d91a32b76fe60220672c4554bc8119a5cb31b9f1741b0bc95eaaa7f457037aecbe00c740d1b8e1b00121032de50ebf1ade927db3ced1e88ea9ddb8bc2503f486dc5b8ef5dd54f67ce12101", "sequence": "ffffffff" }, { "txid": "32074770640754938a380295c9f4408389637c1bd3cbbe0faa86264bcf667094", "vout": "00000000", "scriptsigsize": "6b", "scriptsig": "483045022100c52e23ca33145f9ce7d0e92e7f1386ae06f0a72bca00ce4bbb8ad969d15839020220213978ceadf9788961c52c164c605b40cc669a10ea53ce0a0d282d60606950a4012103c69ce119333de82dc0275539ad70bfae7f366e76a501fb2671052a1278bd8df2", "sequence": "ffffffff" } ], "outputcount": "02", // Number of outputs "outputs": [ // List of transaction outputs { "amount": "94983f0300000000", // The value of the output in satoshis. "scriptpubkeysize": "19", "scriptpubkey": "76a914a82d981ccfa5cb703a4dcecc84d5b29797c307f288ac" }, { "amount": "001bb70000000000", "scriptpubkeysize": "19", "scriptpubkey": "76a914d94afb03198c6cbc0118b50a62f5ae8508e3cf4388ac" } ], "locktime": "00000000" // The earliest time that the transaction can be added to the blockchain } ``` - The `txid` and `vout` in the `inputs` field specify which UTXOs are being used as inputs from previous transactions on the blockchain. - The `scriptsig` in each input field contains the digital signature and public key needed to unlock the UTXOs. - The transaction creates new `outputs`, each with a specific `amount` indicating the value being transferred. - A `scriptPubKey` is applied to each output, specifying the conditions required to spend these outputs in future transactions. Typically, this includes the recipient’s public key hash and opcodes to verify a signature.Here’s the data structure of a CKB transaction:
```json { "version": 0, // Transaction version number "cell_deps": [ // An array of outpoint pointing to the Cells that are dependencies of this transaction. { "out_point": { // A cell outpoint that point to the Cells used as deps. "tx_hash": "0xbd864a269201d7052d4eb3f753f49f7c68b8edc386afc8bb6ef3e15a05facca2", "index": "0x0" }, "dep_type": "dep_group" // Dependency type (0 for Code, 1 for DepGroup) } ], "header_deps": [ // An array of hashes pointing to block headers that are dependencies of this transaction. "0xaa1124da6a230435298d83a12dd6c13f7d58caf7853f39cea8aad992ef88a422" ], "inputs": [ // An array of referenced Cell inputs. { "previous_output": { "tx_hash": "0x8389eba3ae414fb6a3019aa47583e9be36d096c55ab2e00ec49bdb012c24844d", "index": "0x1" }, "since": "0x0" // Timelock feature } ], "witnesses": [ // Provided by transaction creator to make the execution of corresponding Lock Script success. "0x55000000100000005500000055000000410000004a975e08ff99fa0001 42ff3b86a836b43884b5b46f91b149f7cc5300e8607e633b7a29c94dc01c6616a12f62e74a1 415f57fcc5a00e41ac2d7034e90edf4fdf800" ] "outputs": [ // An array of Cells that are used as outputs, { "capacity": "0x746a528800", "lock": { "code_hash": "0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8", "args": "0x56008385085341a6ed68decfabb3ba1f3eea7b68", "hash_type": "type" }, "type": null }, { "capacity": "0x1561d9307e88", "lock": { "code_hash": "0x9bd7e06f3ecf4be0f2fcd2188b23f1b9fcc88e5d4b65a8637b17723bbda3cce8", "args": "0x886d23a7858f12ebf924baaacd774a5e2cf81132", "hash_type": "type" }, "type": null } ], "outputs_data": [ // An array of Cell data for each Cell output. "0x", "0x" ], } ```Setup checks and platform notes
Verify the required commands before starting:
{
"git --version\nnode --version\npnpm --version\noffckb --version\nckb-debugger --version"
}
Installing ckb-debugger compiles native dependencies and can
take around ten minutes. Install it with{" "}
cargo install ckb-debugger. If installation reports{" "}
Could not find protoc, install protobuf and retry:
{"# macOS\nbrew install protobuf\ncargo install ckb-debugger"}
Windows:
-
Add the npm global bin directory and{" "}
{"%USERPROFILE%\\.cargo\\bin"}toPATH. -
If pnpm reports
ERR_PNPM_IGNORED_BUILDS, approve the required dependency build scripts and reinstall. -
Keep the repository in a path without
#; Next.js asset resolution can fail in such paths. - If native tooling remains difficult to configure, use WSL or a Linux Codespace.
Setup checks
Verify the required commands before starting:
{"git --version\nnode --version\nnpm --version\noffckb --version"}