public class LoadScript : MonoBehaviour
{
    void Start()
    {
        StartCoroutine("LoadCube", "Assets/Prefabs/Cube.prefab");
    }

    private IEnumerator LoadCube(string address)
    {
        var handle = Addressables.InstantiateAsync(address);
        yield return handle;
    }
}

void Start()
{
    StartCoroutine("LoadCube");
}

private IEnumerator LoadCube()
{
    // ここでのアドレスは「"Assets/Prefabs/Cube.prefab"」
    var handle = Addressables.LoadAssetAsync<GameObject>("Assets/Prefabs/Cube.prefab");
    yield return handle;
    if (handle.Status == AsyncOperationStatus.Succeeded)
    {
        Instantiate(handle.Result);
    }
}

{
    "m_InstanceProviderData": {
        "m_Id": "UnityEngine.ResourceManagement.ResourceProviders.InstanceProvider",
        "m_ObjectType": {
            "m_AssemblyName": "Unity.ResourceManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
            "m_ClassName": "UnityEngine.ResourceManagement.ResourceProviders.InstanceProvider"
        },
        "m_Data": ""
    },
    "m_SceneProviderData": {
        "m_Id": "UnityEngine.ResourceManagement.ResourceProviders.SceneProvider",
        "m_ObjectType": {
            "m_AssemblyName": "Unity.ResourceManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
            "m_ClassName": "UnityEngine.ResourceManagement.ResourceProviders.SceneProvider"
        },
        "m_Data": ""
    },
    "m_ResourceProviderData": [
        {
            "m_Id": "UnityEngine.ResourceManagement.ResourceProviders.AssetBundleProvider",
            "m_ObjectType": {
                "m_AssemblyName": "Unity.ResourceManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
                "m_ClassName": "UnityEngine.ResourceManagement.ResourceProviders.AssetBundleProvider"
            },
            "m_Data": ""
        },
        {
            "m_Id": "UnityEngine.ResourceManagement.ResourceProviders.BundledAssetProvider",
            "m_ObjectType": {
                "m_AssemblyName": "Unity.ResourceManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
                "m_ClassName": "UnityEngine.ResourceManagement.ResourceProviders.BundledAssetProvider"
            },
            "m_Data": ""
        }
    ],
    "m_ProviderIds": [
        "UnityEngine.ResourceManagement.ResourceProviders.AssetBundleProvider",
        "UnityEngine.ResourceManagement.ResourceProviders.BundledAssetProvider"
    ],
    "m_InternalIds": [
        "http://192.168.12.8:59068/defaultlocalgroup_assets_all_a24ac760a59d320b3bbb60f775296776.bundle",
        "Assets/Prefabs/Cube.prefab",
        "http://192.168.12.8:59068/defaultlocalgroup_unitybuiltinshaders_9a67fe534833c5f7d495e9fbb4da1db6.bundle"
    ],
    "m_KeyDataString": "BQAAAAAjAAAAZGVmYXVsdGxvY2FsZ3JvdXBfYXNzZXRzX2FsbC5idW5kbGUAGgAAAEFzc2V0cy9QcmVmYWJzL0N1YmUucHJlZmFiACAAAABlNWQ0YWE4YWQ1ZjJhNDRmYWIwNzllYWFlNjQyM2NiYwAsAAAAZGVmYXVsdGxvY2FsZ3JvdXBfdW5pdHlidWlsdGluc2hhZGVycy5idW5kbGUENtPzYA==",
    "m_BucketDataString": "BQAAAAQAAAABAAAAAAAAACwAAAABAAAAAQAAAEsAAAABAAAAAQAAAHAAAAABAAAAAgAAAKEAAAACAAAAAAAAAAIAAAA=",
    "m_EntryDataString": "AwAAAAAAAAAAAAAA/////wAAAAAAAAAAAAAAAAAAAAABAAAAAQAAAAQAAAA20/Ng/////wEAAAABAAAAAgAAAAAAAAD/////AAAAAEsCAAADAAAAAAAAAA==",
    "m_ExtraDataString": "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",
    "m_Keys": [
        "defaultlocalgroup_assets_all.bundle",
        "Assets/Prefabs/Cube.prefab",
        "e5d4aa8ad5f2a44fab079eaae6423cbc",
        "defaultlocalgroup_unitybuiltinshaders.bundle",
        "1626592054"
    ],
    "m_resourceTypes": [
        {
            "m_AssemblyName": "Unity.ResourceManager, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
            "m_ClassName": "UnityEngine.ResourceManagement.ResourceProviders.IAssetBundleResource"
        },
        {
            "m_AssemblyName": "UnityEngine.CoreModule, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
            "m_ClassName": "UnityEngine.GameObject"
        }
    ]
}

{
    "m_buildTarget": "StandaloneOSX",
    "m_SettingsHash": "",
    "m_CatalogLocations": [
        {
            "m_Keys": [
                "AddressablesMainContentCatalogRemoteHash"
            ],
            "m_InternalId": "http://192.168.12.8:59068/catalog_2020.05.03.19.43.34.hash",
            "m_Provider": "UnityEngine.ResourceManagement.ResourceProviders.TextDataProvider",
            "m_Dependencies": [],
            "m_ResourceType": {
                "m_AssemblyName": "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
                "m_ClassName": "System.String"
            }
        },
        {
            "m_Keys": [
                "AddressablesMainContentCatalogCacheHash"
            ],
            "m_InternalId": "{UnityEngine.Application.persistentDataPath}/com.unity.addressables/catalog_2020.05.03.19.43.34.hash",
            "m_Provider": "UnityEngine.ResourceManagement.ResourceProviders.TextDataProvider",
            "m_Dependencies": [],
            "m_ResourceType": {
                "m_AssemblyName": "mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089",
                "m_ClassName": "System.String"
            }
        },
        {
            "m_Keys": [
                "AddressablesMainContentCatalog"
            ],
            "m_InternalId": "{UnityEngine.AddressableAssets.Addressables.RuntimePath}/catalog.json",
            "m_Provider": "UnityEngine.AddressableAssets.ResourceProviders.ContentCatalogProvider",
            "m_Dependencies": [
                "AddressablesMainContentCatalogRemoteHash",
                "AddressablesMainContentCatalogCacheHash"
            ],
            "m_ResourceType": {
                "m_AssemblyName": "Unity.Addressables, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null",
                "m_ClassName": "UnityEngine.AddressableAssets.ResourceLocators.ContentCatalogData"
            }
        }
    ],
    "m_ProfileEvents": false,
    "m_LogResourceManagerExceptions": true,
    "m_ExtraInitializationData": [],
    "m_CertificateHandlerType": {
        "m_AssemblyName": "",
        "m_ClassName": ""
    }
}

internal static AsyncOperationHandle<IResourceLocator> CreateInitializationOperation(AddressablesImpl aa, string playerSettingsLocation, string providerSuffix)
{
    new ResourceManagerDiagnostics(aa.ResourceManager);
    var jp = new JsonAssetProvider();
    jp.IgnoreFailures = true;
    aa.ResourceManager.ResourceProviders.Add(jp);
    var tdp = new TextDataProvider();
    tdp.IgnoreFailures = true;
    aa.ResourceManager.ResourceProviders.Add(tdp);
    aa.ResourceManager.ResourceProviders.Add(new ContentCatalogProvider(aa.ResourceManager));

    var runtimeDataLocation = new ResourceLocationBase("RuntimeData", playerSettingsLocation, typeof(JsonAssetProvider).FullName);

    var initOp = new InitializationOperation(aa);
    initOp.m_rtdOp = aa.ResourceManager.ProvideResource<ResourceManagerRuntimeData>(runtimeDataLocation);
    initOp.m_ProviderSuffix = providerSuffix;
    return aa.ResourceManager.StartOperation<IResourceLocator>(initOp, initOp.m_rtdOp);
}

/// <summary>
/// Contains enough information to load an asset (what/where/how/dependencies)
/// </summary>
public interface IResourceLocation
{
    /// <summary>
    /// Internal name used by the provider to load this location
    /// </summary>
    /// <value>The identifier.</value>
    string InternalId { get; }
    /// <summary>
    /// Matches the provider used to provide/load this location
    /// </summary>
    /// <value>The provider id.</value>
    string ProviderId { get; }
    /// <summary>
    /// Gets the dependencies to other IResourceLocations
    /// </summary>
    /// <value>The dependencies.</value>
    IList<IResourceLocation> Dependencies { get; }
.....

/// <summary>
/// Interface used by the Addressables system to find th locations of a given key.
/// </summary>
public interface IResourceLocator
{
    /// <summary>
    /// The id for this locator.
    /// </summary>
    string LocatorId { get; }
    /// <summary>
    /// The keys defined by this locator.
    /// </summary>
    IEnumerable<object> Keys { get; }
    /// <summary>
    /// Retrieve the locations from a specified key.
    /// </summary>
    /// <param name="key">The key to use.</param>
    /// <param name="locations">The resulting set of locations for the key.</param>
    /// <returns>True if any locations were found with the specified key.</returns>
    bool Locate(object key, Type type, out IList<IResourceLocation> locations);
}

// 明示的に初期化
yield return Addressable.InitializeAsync();

// いきなりロードするメソッドを呼んでも、中で勝手に初期化用のロジックが呼ばれます
yield return Addressable.InstantiateAsync(resourceAddress);

// AsyncOperationHandleが返ってくる
var handle = Addressables.LoadAssetAsync<GameObject>("Assets/AssetBundleResources/unitychan.prefab");
// 実行の終了を待つ
yield return handle;
// handle.Resultに取得結果が入る
Instantiate(handle.Result);

var h  = Addressables.InitializeAsync();
yield return h;
Debug.Log($"Addressables.ResourceLocators.Count: {Addressables.ResourceLocators.Count}"); // 1

var h2 = Addressables.LoadContentCatalogAsync("http://192.168.12.8:59068/catalog_2020.05.03.19.43.34.json");
yield return h2;
Debug.Log($"Addressables.ResourceLocators.Count: {Addressables.ResourceLocators.Count}"); // 2

var handle = Addressables.DownloadDependenciesAsync(assetsPath);
yield return handle;

// 参照カウントがデクリメントされる
// 参照カウントが0になった場合、AssetBundleProvider経由でAssetBundle.Unload(true)が呼ばれる
Addressables.Release(handle);

// キャッシュしているAsyncOperationの参照カウントを上げて返している
IAsyncOperation op;
int hash = location.Hash(desiredType);
if (m_AssetOperationCache.TryGetValue(hash, out op))
{
    op.IncrementReferenceCount();
    return new AsyncOperationHandle(op);
}

var handle = Addressables.DownloadDependenciesAsync(assetsPath);
yield return handle;
if (handle.Status == AsyncOperationStatus.Succeeded)
{
    foreach (var resource in handle.Result as System.Collections.Generic.List<UnityEngine.ResourceManagement.ResourceProviders.IAssetBundleResource>)
    {
        // AssetBundleファイル
        AssetBundle ab = resource.GetAssetBundle();
        // 強制Unload
        ab.Unload(true);
    }
}
Addressables.Release(handle);

UnityWebRequest CreateWebRequest(IResourceLocation loc)
{
    if (m_Options == null)
        return UnityWebRequestAssetBundle.GetAssetBundle(loc.InternalId);
    var webRequest = !string.IsNullOrEmpty(m_Options.Hash) ?
        UnityWebRequestAssetBundle.GetAssetBundle(loc.InternalId, Hash128.Parse(m_Options.Hash), m_Options.Crc) :
        UnityWebRequestAssetBundle.GetAssetBundle(loc.InternalId, m_Options.Crc);
....
....

/// <summary>
/// Computes the amount of data needed to be downloaded for this bundle.
/// </summary>
/// <param name="loc">The location of the bundle.</param>
/// <returns>The size in bytes of the bundle that is needed to be downloaded.  If the local cache contains the bundle or it is a local bundle, 0 will be returned.</returns>
public virtual long ComputeSize(IResourceLocation loc)
{
    if (!ResourceManagerConfig.IsPathRemote(loc.InternalId))
        return 0;
    var locHash = Hash128.Parse(Hash);
#if !UNITY_SWITCH && !UNITY_PS4
    var bundleName = Path.GetFileNameWithoutExtension(loc.InternalId);
    if (locHash.isValid) //If we have a hash, ensure that our desired version is cached.
    {
        if (Caching.IsVersionCached(new CachedAssetBundle(bundleName, locHash)))
            return 0;
        return BundleSize;
    }
    else //If we don't have a hash, any cached version will do.
    {
        List<Hash128> versions = new List<Hash128>();
        Caching.GetCachedVersions(bundleName, versions);
        if (versions.Count > 0)
            return 0;
    }
#endif //!UNITY_SWITCH && !UNITY_PS4
    return BundleSize;
}

/// <summary>
/// Interface for computing size of loading a location.
/// </summary>
public interface ILocationSizeData
{
    /// <summary>
    /// Compute the numder of bytes need to download for the specified location.
    /// </summary>
    /// <param name="loc">The location to compute the size for.</param>
    /// <returns>The size in bytes of the data needed to be downloaded.</returns>
    long ComputeSize(IResourceLocation loc);
}