{
  "manageEntity": {
    "action": "Save",
    "entityId": "650109",
    "entityType": "Track",
    "nonce": "0x2e4af1013f6edb4bfe17ad7b4eb0f390d59ff2d4cc6d32920cd13ca3f8a9c788",
    "signature": "0x95f2ec84f6d4f79633962843f633b09b486cab87a1c8b9af29173ade504469310354cbc7583be99443bed173519e92f09f2b18ae27e055f95decc1c55926c1971b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}