{
  "manageEntity": {
    "action": "Save",
    "entityId": "666651313",
    "entityType": "Track",
    "nonce": "0xf9aad8c25d9e2c22a84ba181f8ae813f93dcd2c8f5ac2d8e49ddb16184b76fce",
    "signature": "0x4864e345d937031ede61211a9549116f2bc5beafb1d5631e866a6432dfeb544813aba07546a2b36caeb2fce2aa7b7bb3dc1125706e649f4206152c2582e81c0a1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}