# Suzhi

> Suzhi is a material recovery company based in Tamil Nadu, India. It buys dry recyclable waste (PET, HDPE, PP, cardboard, paper, metal, and plastic film as a ride-along), sorts it to factory grade, bales it, and sells it to registered recyclers and brand supply chains. Every kilo is recorded on a tamper-evident ledger, so buyers, auditors and credit registries get proof of where the material came from. Website: https://suzhi.earth

Last updated: 2026-10-04. Content on this site may be quoted with attribution to Suzhi (https://suzhi.earth).

## What Suzhi does

- Buys dry waste from scrap dealers, waste-picker groups and municipal collection sheds, paid digitally at the scale.
- Sorts by polymer and colour (PET clear, PET green, HDPE natural, PP, film) to factory specification.
- Bales the sorted material and sells GST-invoiced truckloads to registered recyclers.
- Does not process plastic: no washing, shredding, melting or pelletising.
- Records every kilo: weight, photo, GPS and time, hashed on the phone at the moment of purchase.

## How the proof works

- Each record is hashed with keccak256 on the device.
- Each day's records are combined into one Merkle root.
- The root is signed twice: Ed25519 and SLH-DSA-SHA2-128f (a hash-based, post-quantum signature).
- The root's sha256 is timestamped on Bitcoin through OpenTimestamps; a standard .ots receipt is served for each batch.
- Each batch is also logged in the Sigstore Rekor transparency log as a DSSE-wrapped in-toto attestation signed by Suzhi's published attestation key, with an inclusion proof.
- Anyone can verify a Suzhi ID (format: suzhi-{device}-{yyyymmdd}-{seq}) at https://suzhi.earth/#verify. The ledger API is https://api.suzhi.earth (GET /v1/registry/{id}, /v1/anchor/verify/{id}, /v1/ots/{id}, /v1/attestation/{id}).
- One raw record is designed to satisfy India EPR (Plastic Waste Management Rules), Verra PWRM0001, PCX plastic credits, Ocean-Bound Plastic certification, and avoided-open-burning carbon methodologies.

## Why it matters

- India's Plastic Waste Management (Amendment) Rules, 2022 require recycled content in rigid plastic packaging, rising to 60% by 2028-29.
- Clean, single-grade sorted bales sell for 50-100% more than mixed scrap.
- Government audits found lakhs of fake EPR certificates, so verified supply is scarce.

## Answers to common questions

- What is Suzhi? A material recovery company in Tamil Nadu, India that buys, sorts, bales and sells dry recyclable waste with proof of origin for every kilo.
- Does Suzhi process plastic? No. It buys, sorts, bales and sells. Processing stays with the recyclers.
- Who buys from Suzhi? Registered plastic recyclers and brand supply chains that need sorted, GST-invoiced, documented material for India's recycled-content and EPR rules.
- Who sells to Suzhi? Scrap dealers, waste-picker groups and municipal collection sheds, paid digitally at the scale.
- Why Bitcoin and Sigstore Rekor rather than a blockchain of its own? Both are free, public and run by people who are not Suzhi. Bitcoin gives long-term durability; Rekor records within seconds which key logged what. No token and no wallet.

## Pages

- [Home](https://suzhi.earth/): what Suzhi does, the loop, proof, verify, questions, contact
- [Full site text for machines](https://suzhi.earth/llms-full.txt)
- [Verify a record](https://suzhi.earth/#verify)
- [Questions and answers](https://suzhi.earth/#faq)
- [Brand assets](https://suzhi.earth/brand/)
- [Ledger API status](https://api.suzhi.earth/health)

## Contact

- Email: hello@suzhi.earth
- Founder: Saravanan Jaichandaran
- Based in Tamil Nadu, India