{
  "manageEntity": {
    "action": "Save",
    "entityId": "349053521",
    "entityType": "Track",
    "nonce": "0x121b6c2e4f331d74b6ba6d12bb73d80fe37eb657bf8adc5b9a32ea778b502213",
    "signature": "0x9d8192dea196d509c994b74b31cfb1112a83077d7c38d4ff4fdc793f7b0fd62e530e00520b5f622d5a9d43607b71d5b0169fea7d0053a0a42b682e7a9e0f65b11c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}