{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638414465",
    "entityType": "Track",
    "nonce": "0xde01bb5df51697fd8a6c4769ea4708b4df78a7a71da3a09ed1e610795bcb6dfd",
    "signature": "0x1859715a960141e354924ac7e837ad7bfde0842f9a976678c3da3022d9a18957732fdd971633e567c244c90f75d9ba6528a546723775fff2f90d4b1daea4c3981c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}