{
  "manageEntity": {
    "action": "Save",
    "entityId": "50885",
    "entityType": "Track",
    "nonce": "0xe07c764fbc7f599c59be36fc8575517f5c3863c2d446ef6a066af5968bfefdcb",
    "signature": "0xe3408cba1b5a76e6ea648836c02dfdcc0aca7b7fce67ee278d247a1f1296c2702343edfc04f69396da849888d507540742e5f56a8874792f60bb2458c89706111b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}