{
  "manageEntity": {
    "action": "Save",
    "entityId": "720741432",
    "entityType": "Track",
    "nonce": "0x5c8f2bf2f6e616d704ec753ba43c375fdc37ca30d839194026c374af7d3a3262",
    "signature": "0x5141579440a47a9e3339695d810a1bb5acda9b8970bcafa68fc750f7b9145155267ee69605c7ebe84380ff6782add2faa170eebcf35a3078414d91d8849469a61b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}