{
  "manageEntity": {
    "action": "Save",
    "entityId": "2146393711",
    "entityType": "Track",
    "nonce": "0x4bcaca63e2eb8f63a94531ed95f9ee9378a3e57e18c302530c6323a475f605eb",
    "signature": "0x988cae988344679663ac7662891de2204b991c2364002c7db67a227bcec58d6e687be183180fa1258c76621439e83d5ebf3d0bb0c0e52701e86de3e8bb2262b91b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}