{
  "manageEntity": {
    "action": "Save",
    "entityId": "591491732",
    "entityType": "Track",
    "nonce": "0xcd62321ff5d0506ebc8217307eb8c853e07d20f63f937eed08ea27a353e23cfd",
    "signature": "0x12ac4dfed406af27cbe65e6f6da1e6be4d64544489589237950037f03ae9580056ddde602b5ea2a40bb4eea4a629b1b1f087266e1cc0880824a2b47cf81eef981c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}