{
  "manageEntity": {
    "action": "Save",
    "entityId": "973000728",
    "entityType": "Track",
    "nonce": "0x60d5a167cef21a43f2c29a2a3cfab9694a027b90c322ffcd746fc8bdfbba1c41",
    "signature": "0x4e5c90c4fc900cc0e62bb9b02824dd9b7b042fab64f6dd3909b795b7fb27e53610c1eb8a8e741723b1eed1fb562889d91ede4e78604b3a01236be11e436643e31b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}