{
  "manageEntity": {
    "action": "Save",
    "entityId": "520646089",
    "entityType": "Track",
    "nonce": "0xaa4d37e2dd6aed1dc6ef06815f7e6767907bf4972b8a11e3d4c725ccf9462dc4",
    "signature": "0x36842e4be059732f6799228d40bf444ceeef4ce49539bd03583c9e6953e1ca8e0cfc6ea9c5358f059a54c51ceb8fd5f9e11072933b3de7c21c9a4a82b9a7a9231c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}