{
  "manageEntity": {
    "action": "Save",
    "entityId": "304601261",
    "entityType": "Track",
    "nonce": "0x51c05d023ce22595c167c825aedf0f0a077a62042393240aeea34f64de851b16",
    "signature": "0x41f13c5bf560f5a0ea8f3111b5d6eba6f3abcc8a9a0baded8e37ebea82572858051efe40a6dff1817e3e8480a23b47514f551ad66fc423077f74f9f7afc188341c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}