{
  "manageEntity": {
    "action": "Save",
    "entityId": "129305",
    "entityType": "Track",
    "nonce": "0x019661ae38d6a7a9543566a96503e02d365b765c7bf2870d170633ac07d24cd9",
    "signature": "0x7f9189d60c60156f31a505773698f3a1f994cfc817931d9138a075e817aac4eb5e846f664b671ba40420d8d019bedb833f2fc498e85ea2645ac75e21c0b0dc521c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}