{
  "manageEntity": {
    "action": "Save",
    "entityId": "215604162",
    "entityType": "Track",
    "nonce": "0x637ef4a092fb8d30874c0707baf2506ba2ec33bbfc29a8ceb6e564e333c650fc",
    "signature": "0xc91c34aaed71c136a6c8e4b1c1b8db751368663abc3cabbeec86a1c9efe0ba1f67eec4898e40274dc30ff49665f1e6611aa8626739a4f6d7f882ec6fc42b378d1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}