diff --git a/contracts/did/did.c b/contracts/did/did.c
new file mode 100644
index 0000000..3de93ac
--- /dev/null
+++ b/contracts/did/did.c
@@ -0,0 +1,168 @@
+//------------------------------------------------------------------------------
+/*
+    Copyright (c) 2024 Transia, LLC
+
+    This financial tool is designed for use by individuals or organizations 
+    that hold the appropriate licenses and qualifications to engage with such 
+    products in a manner that complies with all relevant laws and regulations. 
+    Unauthorized use or redistribution of this tool may result in legal action.
+
+    The content provided in this financial tool is for informational purposes 
+    only and should not be interpreted as financial advice or an endorsement of 
+    any particular investment or financial strategy. Users should seek advice 
+    from a certified professional or financial advisor before making any 
+    investment choices.
+
+    By using this financial tool, the user agrees to indemnify Transia, LLC from 
+    any claims, damages, or losses that may arise from their use or reliance on 
+    the information contained within. The user acknowledges that they are utilizing 
+    this tool at their own risk and that Transia, LLC will not be held responsible 
+    for any direct, indirect, incidental, punitive, special, or consequential 
+    damages, including but not limited to, damages for lost profits, goodwill, 
+    usage, data, or other intangible losses.
+
+*/
+//==============================================================================
+
+#include <stdint.h>
+#include "hookapi.h"
+
+#define DONE(x)\
+    return accept(SBUF(x), __LINE__)
+
+#define NOPE(x)\
+    return rollback(SBUF(x), __LINE__)
+
+#define SIG_OFFSET 52U
+
+const uint8_t dids_namespace[] = {
+    0x43U, 0xF6U, 0xCBU, 0x20U, 0x14U, 0x01U, 0x66U, 0xCCU,
+    0x9EU, 0x7AU, 0x5EU, 0x07U, 0xFCU, 0xA8U, 0xE8U, 0x4CU,
+    0xB7U, 0xE5U, 0x76U, 0x21U, 0x92U, 0x78U, 0x8BU, 0x5DU,
+    0x4CU, 0xD0U, 0x8FU, 0x1FU, 0xD0U, 0x5FU, 0xF1U, 0x58U
+};
+
+int64_t hook(uint32_t r)
+{
+    _g(1,1);
+
+    uint8_t hook_acc[32];
+    hook_account(hook_acc + 12, 20);
+
+    uint8_t otx_acc[32];
+    otxn_field(otx_acc + 12, 20, sfAccount);
+
+    if (BUFFER_EQUAL_20(hook_acc, otx_acc))
+        DONE("did.c: passing outgoing txn");
+
+    int64_t tt = otxn_type();
+    if (tt != ttINVOKE)
+        NOPE("did.c: Rejecting non-Invoke, non-Payment txn.");
+
+    // get admin account
+    uint8_t admin[20];
+    if (hook_param(SBUF(admin), "ADM", 3) != 20)
+        NOPE("did.c: Misconfigured. Missing ADM install parameter.");
+
+    uint8_t op;
+    if (otxn_param(&op, 1, "OP", 2) != 1)
+        NOPE("did.c: Missing OP parameter on Invoke.");
+
+    TRACEHEX(op);
+
+    uint8_t so;
+    if (otxn_param(&so, 1, "SO", 2) != 1)
+        NOPE("did.c: Missing SO parameter on Invoke.");
+
+    TRACEHEX(so);
+
+    // admin invoke ops are: 
+    // VC - validator create (admin)
+    // VU - validator update (admin)
+    // VD - validator delete (admin)
+    
+    // validator invoke ops are: 
+    // DC - did create (validator)
+    // DU - did update (validator)
+    // DD - did delete (validator)
+
+    // admin permission check
+    int64_t is_admin = BUFFER_EQUAL_20(otx_acc + 12, admin);
+    if (!is_admin && op == 'V')
+        NOPE("did.c: Admin only operation.");
+
+    // validator permission check
+    uint8_t acc[20];
+    uint8_t key[33];
+    if ((op == 'D') && state(SBUF(key), otx_acc + 12, 20) == DOESNT_EXIST)
+    {
+        NOPE("did.c: Validator does not exist.");
+    }
+
+    // get signature if any
+    // Signature format is packed binary data of the form:
+    // <20 byte dest accid><32 byte var string><signature>
+    uint8_t sig_buf[256];
+    int64_t sig_len = otxn_param(SBUF(sig_buf), "SIG", 3);
+    if (sig_len > 0)
+    {
+        if (sig_len < 80)
+            NOPE("did.c: Signature too short.");
+
+        if (!util_verify(sig_buf, SIG_OFFSET, sig_buf + SIG_OFFSET, sig_len - SIG_OFFSET, SBUF(key)))
+            NOPE("did.c: Signature verification failed.");
+    }
+    // action
+    switch (op)
+    {
+        case 'V':
+        {
+            otxn_param(SBUF(acc), "VA", 2);
+            otxn_param(SBUF(key), "VK", 2);
+            switch (so)
+            {
+                case 'C':
+                case 'U':
+                {
+                    state_set(SBUF(key), acc, 20);
+                    DONE("did.c: Validator Created.");
+                }
+                case 'D':
+                {
+                    state_set(0, 0, acc, 20);
+                    DONE("did.c: Validator Deleted.");
+                }
+                default:
+                    NOPE("did.c: Unknown sub operation.");
+            }
+        }
+        case 'D':
+        {
+            otxn_param(SBUF(acc), "CA", 2);
+            switch (so)
+            {
+                case 'C':
+                case 'U':
+                {
+                    state_foreign_set(SBUF(sig_buf), acc, 20, dids_namespace, 32, hook_acc + 12, 20);
+                    DONE("did.c: DID Create.");
+                }
+                case 'D':
+                {
+                    state_foreign_set(0, 0, acc, 20, dids_namespace, 32, hook_acc + 12, 20);
+                    DONE("did.c: DID Create.");
+                }
+            
+            default:
+                NOPE("did.c: Unknown sub operation.");
+            }
+        }
+
+        default:
+        {
+            NOPE("did.c: Unknown operation.");
+        }
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/test/integration/did/did.test.ts b/test/integration/did/did.test.ts
new file mode 100644
index 0000000..333bb0c
--- /dev/null
+++ b/test/integration/did/did.test.ts
@@ -0,0 +1,214 @@
+// xrpl
+import { Invoke, SetHookFlags, TransactionMetadata } from '@transia/xrpl'
+// xrpl-helpers
+import {
+  XrplIntegrationTestContext,
+  setupClient,
+  teardownClient,
+  serverUrl,
+} from '@transia/hooks-toolkit/dist/npm/src/libs/xrpl-helpers'
+// src
+import {
+  Xrpld,
+  SetHookParams,
+  setHooksV3,
+  createHookPayload,
+  ExecutionUtility,
+  clearHookStateV3,
+  clearAllHooksV3,
+  iHook,
+  iHookParamEntry,
+  iHookParamName,
+  iHookParamValue,
+  StateUtility,
+  padHexString,
+  hexNamespace,
+} from '@transia/hooks-toolkit'
+import {
+  decodeModel,
+  xrpAddressToHex,
+} from '@transia/hooks-toolkit/dist/npm/src/libs/binary-models'
+import { sign, verify } from '@transia/ripple-keypairs'
+import { DIDModel } from './models/DIDModel'
+
+// Step 1:
+// - DMV Manager adds/updates/deletes clerk
+// Key: clerkAcct: Data: publicKey
+
+// Step 2:
+// - Document created/encrypted (Document ID is generated)
+// - DMV Clerk signs DIDModel(owner, document id)
+// - DMV Clerk submits invoke to hook
+// Key: citizen: Data: message + sig
+
+// Step 3:
+// - Anyone Anywhere verifies user account
+
+describe('oracle', () => {
+  let testContext: XrplIntegrationTestContext
+
+  beforeAll(async () => {
+    testContext = await setupClient(serverUrl)
+    const hookWallet = testContext.hook1
+    const adminWallet = testContext.alice
+    const hookParam1 = new iHookParamEntry(
+      new iHookParamName('ADM'),
+      new iHookParamValue(xrpAddressToHex(adminWallet.classicAddress), true)
+    )
+    const acct1hook1 = createHookPayload({
+      version: 0,
+      createFile: 'did',
+      namespace: 'validators',
+      flags: SetHookFlags.hsfOverride,
+      hookOnArray: ['Invoke'],
+      hookParams: [hookParam1.toXrpl()],
+    })
+    await setHooksV3({
+      client: testContext.client,
+      seed: hookWallet.seed,
+      hooks: [{ Hook: acct1hook1 }],
+    } as SetHookParams)
+  })
+  afterAll(async () => {
+    const clearHook1 = {
+      Flags: SetHookFlags.hsfNSDelete,
+      HookNamespace: hexNamespace('validators'),
+    } as iHook
+    const clearHook2 = {
+      Flags: SetHookFlags.hsfNSDelete,
+      HookNamespace: hexNamespace('dids'),
+    } as iHook
+    await clearHookStateV3({
+      client: testContext.client,
+      seed: testContext.hook1.seed,
+      hooks: [{ Hook: clearHook1 }, { Hook: clearHook2 }],
+    } as SetHookParams)
+
+    await clearAllHooksV3({
+      client: testContext.client,
+      seed: testContext.hook1.seed,
+    } as SetHookParams)
+    teardownClient(testContext)
+  })
+
+  it('did - create validator', async () => {
+    const hookWallet = testContext.hook1
+    const adminWallet = testContext.alice
+    const clerk1Wallet = testContext.bob
+    // const keypair = Wallet.generate()
+    const otxnParam1 = new iHookParamEntry(
+      new iHookParamName('OP'),
+      new iHookParamValue('V')
+    )
+    const otxnParam2 = new iHookParamEntry(
+      new iHookParamName('SO'),
+      new iHookParamValue('C')
+    )
+    const otxnParam3 = new iHookParamEntry(
+      new iHookParamName('VA'),
+      new iHookParamValue(xrpAddressToHex(clerk1Wallet.classicAddress), true)
+    )
+    const otxnParam4 = new iHookParamEntry(
+      new iHookParamName('VK'),
+      new iHookParamValue(clerk1Wallet.publicKey, true)
+    )
+    const builtTx1: Invoke = {
+      TransactionType: 'Invoke',
+      Account: adminWallet.classicAddress,
+      Destination: hookWallet.classicAddress,
+      HookParameters: [
+        otxnParam1.toXrpl(),
+        otxnParam2.toXrpl(),
+        otxnParam3.toXrpl(),
+        otxnParam4.toXrpl(),
+      ],
+    }
+
+    const result1 = await Xrpld.submit(testContext.client, {
+      wallet: adminWallet,
+      tx: builtTx1,
+    })
+    const hookExecutions1 = await ExecutionUtility.getHookExecutionsFromMeta(
+      testContext.client,
+      result1.meta as TransactionMetadata
+    )
+    expect(hookExecutions1.executions[0].HookReturnString).toMatch(
+      'did.c: Validator Created.'
+    )
+  })
+  it('did - create did', async () => {
+    const hookWallet = testContext.hook1
+    const clerk1Wallet = testContext.bob
+    const citizenWallet = testContext.carol
+    // const keypair = Wallet.generate()
+    const otxnParam1 = new iHookParamEntry(
+      new iHookParamName('OP'),
+      new iHookParamValue('D')
+    )
+    const otxnParam2 = new iHookParamEntry(
+      new iHookParamName('SO'),
+      new iHookParamValue('C')
+    )
+    const otxnParam3 = new iHookParamEntry(
+      new iHookParamName('CA'),
+      new iHookParamValue(xrpAddressToHex(citizenWallet.classicAddress), true)
+    )
+    const hex = new DIDModel(clerk1Wallet.classicAddress, '123456').encode()
+    const signature = sign(hex, clerk1Wallet.privateKey)
+    expect(verify(hex, signature, clerk1Wallet.publicKey)).toBe(true)
+
+    const otxnParam4 = new iHookParamEntry(
+      new iHookParamName('SIG'),
+      new iHookParamValue(hex + signature, true)
+    )
+    const builtTx1: Invoke = {
+      TransactionType: 'Invoke',
+      Account: clerk1Wallet.classicAddress,
+      Destination: hookWallet.classicAddress,
+      HookParameters: [
+        otxnParam1.toXrpl(),
+        otxnParam2.toXrpl(),
+        otxnParam3.toXrpl(),
+        otxnParam4.toXrpl(),
+      ],
+    }
+
+    const result1 = await Xrpld.submit(testContext.client, {
+      wallet: clerk1Wallet,
+      tx: builtTx1,
+    })
+    const hookExecutions1 = await ExecutionUtility.getHookExecutionsFromMeta(
+      testContext.client,
+      result1.meta as TransactionMetadata
+    )
+    expect(hookExecutions1.executions[0].HookReturnString).toMatch(
+      'did.c: DID Create.'
+    )
+
+    const sigState = await StateUtility.getHookState(
+      testContext.client,
+      hookWallet.classicAddress,
+      padHexString(xrpAddressToHex(citizenWallet.classicAddress)),
+      hexNamespace('dids')
+    )
+    // Signature Total - 256 (in hook) * 2
+    const sigTotal = 256 * 2
+    const model = decodeModel(
+      sigState.HookStateData.slice(0, hex.length),
+      DIDModel
+    )
+    const clerkState = await StateUtility.getHookState(
+      testContext.client,
+      hookWallet.classicAddress,
+      padHexString(xrpAddressToHex(model.validator)),
+      hexNamespace('validators')
+    )
+    expect(
+      verify(
+        model.encode(),
+        sigState.HookStateData.slice(hex.length, sigTotal).replace(/0+$/, ''),
+        clerkState.HookStateData
+      )
+    ).toBe(true)
+  })
+})
diff --git a/test/integration/did/models/DIDModel.ts b/test/integration/did/models/DIDModel.ts
new file mode 100644
index 0000000..47d5042
--- /dev/null
+++ b/test/integration/did/models/DIDModel.ts
@@ -0,0 +1,35 @@
+import {
+  BaseModel,
+  Metadata,
+  XRPAddress,
+  VarString,
+} from '@transia/hooks-toolkit/dist/npm/src/libs/binary-models'
+
+export class DIDModel extends BaseModel {
+  validator: XRPAddress
+  did: VarString
+
+  // 52 bytes
+  constructor(
+    validator: XRPAddress, // 20 byte / 0
+    did: VarString // 31 byte + 1 byte / 20
+  ) {
+    super()
+    this.validator = validator
+    this.did = did
+  }
+
+  getMetadata(): Metadata {
+    return [
+      { field: 'validator', type: 'xrpAddress' },
+      { field: 'did', type: 'varString', maxStringLength: 31 },
+    ]
+  }
+
+  toJSON() {
+    return {
+      validator: this.validator,
+      did: this.did,
+    }
+  }
+}