{
  "manageEntity": {
    "action": "Save",
    "entityId": "221783",
    "entityType": "Track",
    "nonce": "0xb46a7fccea3efd1f3b598320cc423ca583dabbca47092a7d7a13bbd58c0149e3",
    "signature": "0xfe07888d2d8fa2d3fd5056b5e7fb36d4151df0fdc6051be3fe8a19a7ba4b180b30ce072f041a90b2670f9491d58c70f26798269e233dda46b00063ff746107381c",
    "signer": "0x53d8e61f7BdCd69E26B5AAe8F197464091224DB4",
    "userId": "99786"
  }
}