{
  "manageEntity": {
    "action": "Save",
    "entityId": "223785520",
    "entityType": "Track",
    "nonce": "0x12f5659f50e26e621828db9552888932862bc6640d029994f1bf2a64a2de3ec4",
    "signature": "0x02c408aaa02b3a4a8d632aaa6bff0e538fbd8e52b0fbf1f1e31864be57b23f272bf0e99998cd0a3ffdf1e20d21e414fb4ac12ea4182f4cf8a6d88419a99165a51b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}