{
  "manageEntity": {
    "action": "Save",
    "entityId": "295428",
    "entityType": "Track",
    "nonce": "0x8c437748b9bff50c1e2833f4d4c2b409d9e6249c83ef10b2ce92efcceffc00c2",
    "signature": "0x68f0405578b7a67bb63219b5deac58504ba011293178aa8a8e96ddbffdee2c7d6a4c2b445bfaf99fd0a63aea4ac3fc7cd20a68f51c4bc15ccec70cbc948c4b651c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}