{
  "manageEntity": {
    "action": "Save",
    "entityId": "1333577457",
    "entityType": "Track",
    "nonce": "0x25fccc630cb74a41f59b4ce12cc3bd678a8345c9d6b6e9cb56f07e43c5e4a8b2",
    "signature": "0xe31415739c704a3ab3becdbd2bc58a61a1a8e210209396595584cb27c9bbd0c2473e7f86d774c929f4737dba9e40b38fcb28333cd58bf9a433f662462ec110881c",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}