{
  "manageEntity": {
    "action": "Save",
    "entityId": "445640515",
    "entityType": "Track",
    "nonce": "0x0ab1784db835925d470f26e120d5fa38f7c6f6a5d6b0ba9f7ff0b726652c21f7",
    "signature": "0x309ce458d08216ef737564d0fbf7effb8c6c1a72dcb658e1acf928d9120552b6135fcbab74660ffb03c7c2d471144cbec6c3e5ba54e86680dd219af4eaf5d2e11c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}