{
  "manageEntity": {
    "action": "Save",
    "entityId": "528782",
    "entityType": "Track",
    "nonce": "0x9abf8477382596077a8236417b7da3955a53ba70de56625bf97441d78188829b",
    "signature": "0xede674f239516c4e16031f9e7293026a3f68ad2c756472979a676a7c79dda8ed23f84ccff594d5536fcd6833cd23d60f184236e626b27f593b6cf386a79c23e11b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}