{
  "manageEntity": {
    "action": "Save",
    "entityId": "877266240",
    "entityType": "Track",
    "nonce": "0x95e5d1bcad42c14f24ed174cbd9dd7f4f294c3fe9b90689278eec735fa3f39a7",
    "signature": "0x9222e7813d6dc4d182b9324e79853087e4847fc95b2cdf05816879313c5f6dd975c89199f7b40954b44f95dbb4702be80e79fc664d332bd0f82b2f4b3bc162991c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}