{
  "manageEntity": {
    "action": "Save",
    "entityId": "957267899",
    "entityType": "Track",
    "nonce": "0x900ab741f4f376ed4cda2d965760060ae6f62bf43a209f8431ea43e41ca3bc3b",
    "signature": "0x9d9a56fab67e362337e3baa99ef5d22edde3f992e209fe24fcbbe0369d8c33133fb1aff23f95c52f7ef7dc33ed29fab0f2715fc37c2f8b13b7a19ea8ddb2021f1c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}