{
  "manageEntity": {
    "action": "Save",
    "entityId": "820443877",
    "entityType": "Track",
    "nonce": "0x5f0e17f8ea75787f8597d345aaefae688bd7439b8c48087eeeba842b132d3f42",
    "signature": "0x8d3308637a6bca5460513346876c16d918e4556630127b5f5b0b36074fced6bf0db1e0b6d7c90236e4ff928be12c4a2a6d0e03eecef1d737f01365d95a451c951b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}