{
  "manageEntity": {
    "action": "Save",
    "entityId": "393387911",
    "entityType": "Track",
    "nonce": "0x639af28c0817d911416472d46605d26e1bae6bb31534372fae4ec477879d02db",
    "signature": "0xdaeccd9ed2738d7923eb12f8f0d8f76a6a2a4e52c3d0d317e76ad29fc77204c206a81552ef6b774c12cf5ee009632b85201ed25edc03f96d127035a0ea27c8cd1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}