{
  "manageEntity": {
    "action": "Save",
    "entityId": "619479",
    "entityType": "Track",
    "nonce": "0x467d4075982291b90cdf900b90a60f8e83b3105fe81860fbb38d6f7f1d1a4726",
    "signature": "0x46969744575faa5d245de394231009a92906613bfb62afeac339b06ad652fd5f62d326b9d30c0af8e2db2d6ac91f7d99f2c9a1b9f1735b0ed4abfc103fb517f71c",
    "signer": "0x7eBAab495a64FAea1f04dc59ff804bf939da7B12",
    "userId": "709077025"
  }
}