{
  "manageEntity": {
    "action": "Save",
    "entityId": "478214591",
    "entityType": "Track",
    "nonce": "0xeee9e9d382ef23acb59413ed7757e53a1baf6874e22244b1d67dda0154fe6bc7",
    "signature": "0xb40dea19215faed69142a1f976b5166eb7b29a978374cab7ef0174f257fd5b98465415d030c9bb34ec3b3f59e9d9230d36fe90846b97ede94e9f8e7959751d351c",
    "signer": "0x0685dE64d6C1DD2F4492DE8d4D836Bde25c77910",
    "userId": "392433914"
  }
}