HLP-4 — Hash-Linked Protocol Specification

Paper: L7-HLP-SPEC
Version: 2026.08.26-4
Effective: August 26, 2026
Pages: 8 (print)

HLP-4 (Hash-Linked Proof) is a cryptographic validation hash that attests a transaction has been sealed across multiple blockchains over the public internet. A wrap on L7 Chain is a single composite digest: the L7C identifier concatenated with the current head of every live rail. It is a hash-link of the full multi-rail state, not a snapshot of any one chain. Occupancy is strictly 1:1. A failed seal produces no state change and no asset movement.

Public technical specification. Not a securities prospectus. Not legal advice.

Schematic drawings · HLP-4

Fig. planesFive-plane wrap blueprint. Data only down. A failed plane aborts.

L7-HLP-SPEC · 1. Abstract

1. Abstract

This is the technical specification of HLP (Hash-Linked Proof), formally the Aggregated Hash-Linked Protocol (AHLP). Live generation is HLP-4. Digest namespace is HLP-2. It describes the instrument as implemented on L7 Chain, readable at l7c.ai. It is not legal advice and not a securities prospectus.

The HLP (Hash-Linked Proof) is the wrap bind on L7 Chain. A wrap folds the live head of L7C and every rail spine into one SHA-256 digest. Live generation is HLP-4. The digest namespace remains HLP-2. A failed seal produces no state change and no asset movement.

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L7-HLP-SPEC · 2. History of the protocol

2. History of the protocol

HLP was developed because a wrap that stamps one foreign tip is a screenshot. L7 Chain watches many rails at once. Occupancy is 1:1 against native locked in a published vault. The bind had to answer one question at lock time: while this native was locked, what did every watched chain look like? That answer is a cryptographic validation hash that attests a transaction has been sealed across multiple blockchains over the public internet — a hash-link — not a dashboard of someone else’s chain.

The blueprint did not change. Five planes, data only down: Wallet → Vault → Field → Hash-link → Book. A failed plane aborts. What changed is the field, the names, and how stables enter the digest.

Fig. gensGenerations of the bind. The planes stayed. The field grew. Live generation is HLP-4.

Generation	Name on the book	Field	Stable coins	Blueprint
Founding	Aggregated Linked Hash Postulate	Idea: fold every live spine, no fixed order	Not in the bind. USDC, USDT (Tether), and DAI were not records.	Postulate only. No payload grammar. No digest namespace.
Protocol	Aggregated Linked Hash Protocol (ALHP), then Aggregated Hash-Linked Protocol (AHLP). Product name: HLP (Hash-Linked Proof).	Named instrument. L7C first. Rails as hash-linked spines.	Ride hosts. Not field members. A USDC wrap still committed L7C and rails, not a USDC slot.	Wallet → Vault → Field → Hash-link → Book. Combo is the full field. Cluster is gold on the map.
HLP-1	HLP (Hash-Linked Proof). Tags HLP, AHLP, ALHP parse as the same protocol.	19 records, fixed order. L7C + ADA…XRP. BASE, ARB, OP, HOOD are Ethereum L2 spines, not coins you buy.	USDC, USDT, DAI ride hosts only. Those sums are history, not the wrap hash.	Payload ASSET:height:hash joined on \|. SHA-256 → 64 hex digest. HLP_PAYLOAD on the seal so the explorer can rebuild.
Short HLP	H1S — Short Hash-Link	Same HLP-1 / HLP-2 field. Projection, not a new digest.	Mask bit per field slot. A live stable sets its bit once it is a field member (HLP-2).	20 Crockford characters. Version + live mask + braid-fold + CRC-8. The 64-hex digest remains the bind.
HLP-2	HLP (Hash-Linked Proof), formally Aggregated Hash-Linked Protocol (AHLP)	22 records. L7C first, then A–Z including DAI, USDC, USDT. Digest namespace HLP-2.	First-class field members. Each stable is an aggregated host bind: height = sum of host tips; hash = SHA-256 of those host records. Hosts keep their own slots.	Same five planes. Combo is 22. Short HLP v1 braids all 22. Verify SHA-256(payload) and H1S on /tx/{hash}.
HLP-3	HLP (Hash-Linked Proof). Prior generation on L7-3 / wrooms-l7-3.	Same 22-slot field. Digest namespace remains HLP-2. Dual-gen verify of HLP-1 (19) and HLP-2/3 (22).	Same aggregated host binds. Field health score (live / hashed / lagging). Memo stamps G3 and H{score}.	Same five planes. Short HLP v2 (H1S version 2). v1 shorts still verify.
HLP-4 (live)	HLP (Hash-Linked Proof). Live generation on L7-4 / wrooms-l7-4.	Same 22-slot field. Digest namespace remains HLP-2. Quad-gen verify of HLP-1 (19) and HLP-2/3/4 (22).	Same aggregated host binds. Field health score (live / hashed / lagging). Memo stamps G4 and H{score}.	Same five planes. Short HLP v3 (H1S version 3). v1 and v2 shorts still verify. New wraps write HLP-4; old seals verify unchanged.

Stable-coin implementation. A stable is not an L1 and not an L2. HLP-2 puts USDC, USDT, and DAI in the field as aggregated host binds without inventing a USDC chain. HLP-3 and HLP-4 do not reopen that field. HLP-4 is the live generation that writes and verifies those 22 slots, scores field health, and seals Short HLP v3.

Founding     postulate
Protocol     ALHP / AHLP / HLP named
HLP-1        19 slots. Stables ride hosts
Short HLP    H1S projection
HLP-2        22 slots. DAI · USDC · USDT aggregated host binds
HLP-3        prior generation. Same 22-slot HLP-2 digest. Dual-gen verify. H1S v2. Field health.
HLP-4        live generation. Same 22-slot HLP-2 digest. Quad-gen verify. H1S v3. G4 memo stamps.

Planes (unchanged)
0 Wallet → 1 Vault → 2 Field → 3 Hash-link → 4 Book

HLP-1 seals still verify under the 19-slot grammar. HLP-2, HLP-3, and HLP-4 wraps use the 22-slot grammar. The digest namespace is HLP-2. A further change to field membership or record grammar is HLP-5 and a new digest namespace.

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L7-HLP-SPEC · 3. What the protocol does

3. What the protocol does

HLP answers one question at wrap time: while this native was locked, what did every watched chain look like? Combo is the full 22-slot field. Cluster gold is not the digest.

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L7-HLP-SPEC · 4. Blueprint

4. Blueprint

Five planes, data only down: Wallet → Vault → Field → Hash-link → Book. Field order is the HLP-2 22-slot tuple. HLP-4 is the live generation that writes and verifies it.

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L7-HLP-SPEC · 5. Verification

5. Verification

Rebuild SHA-256(payload) from HLP_PAYLOAD. Quad-gen accepts HLP-1 19-slot and HLP-2/3/4 22-slot payloads. H1S v1, v2, and v3 all verify. Occupancy remains 1:1.

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L7-HLP-SPEC · 6. Versioning

6. Versioning

This specification is HLP-4. Digest namespace remains HLP-2. A further change to field membership or record grammar is HLP-5 and a new digest namespace. Related: /hlp · /audit · /agreement §7.

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