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Example code of onematrix/tracing-sdk

Informations about the package tracing-sdk

Tracing SDK (PHP)

PHP implementation of the Tracing SDK. Canonicalizes a record, hashes it with Keccak-256, and sends the hash to an Indexer service. Canonicalization and hashing happen inside send()/sendBatch(), which return the hash alongside the Indexer's response. The SDK has no buffering, timers, or background sending — you decide when to send, one record at a time or a batch. Once a record is anchored, it can be looked up again by its hash and verified against the chain through your own RPC node.

Requires PHP 7.1+ or 8.x, plus the json, dom, libxml, curl, and mbstring extensions.

Install

Usage

That is the whole happy path for anchoring. Everything else — batching, XML and raw data, timeouts, the auth types, looking an anchor up by hash, and verifying it against the chain — is covered in the usage guide:

Design notes

  • Canonicalization. JSON follows RFC 8785 (the JSON Canonicalization Scheme / JCS): object member names are sorted by UTF-16 code unit value (not byte order — the two disagree for characters outside the Basic Multilingual Plane), numbers are formatted per the ECMAScript Number::toString algorithm (so 1, 1.0, and 1e0 all canonicalize identically, and -0 normalizes to 0), and a JSON object is never mistaken for a JSON array even when its keys happen to be sequential integers starting at 0. XML is canonicalized with Exclusive XML Canonicalization 1.0 (http://www.w3.org/2001/10/xml-exc-c14n#) without comments, via DOMDocument::C14N(true), which normalizes attribute order and insignificant whitespace and emits only the namespace declarations actually used by the document — a declared-but-unused xmlns does not affect the hash. Namespace prefixes are still significant: Exclusive 1.0 has no prefix rewriting (that is a Canonical XML 2.0 feature, which libxml does not implement), so re-serializing a document with different prefixes changes its hash. External entity resolution is disabled for XML input to prevent XXE, since rawData is untrusted. dataType: 'raw' skips canonicalization entirely — the input is hashed exactly as given, with no parsing; use it when the caller already guarantees a single deterministic representation.
  • Hashing. Keccak-256 (the original Keccak, as used by Ethereum — not FIPS-202 SHA3-256), via kornrunner/keccak rather than a hand-rolled implementation. Output is a 0x-prefixed hex string.
  • Verification. verify() trusts nothing but the chain: it reads the proof transaction's receipt straight from an RPC endpoint you configure, decodes the logs whose topics[0] is keccak256("Anchored(bytes32,uint64)"), and compares the event's bytes32 argument with the record hash. The Indexer is never asked to vouch for itself.

Testing

All versions of tracing-sdk with dependencies

PHP Build Version
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Requires php Version ^7.1 || ^8.0
ext-json Version *
ext-dom Version *
ext-libxml Version *
ext-curl Version *
ext-mbstring Version *
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