{
  "manageEntity": {
    "action": "Save",
    "entityId": "523734",
    "entityType": "Track",
    "nonce": "0x08e10b7172572cb68e4cdc45c15fea9bc7480763455a1c699e57be26143d2b04",
    "signature": "0x0f84c31780c2d354d920140468391defb3c14ec8ba52945f26c9c46f01cb8c3a200ac5c6ba15e12626370a246f02d05a5d94def95c87cbc7363747daa89b26c01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}