{
  "manageEntity": {
    "action": "Save",
    "entityId": "766538591",
    "entityType": "Track",
    "nonce": "0xa0d33b10754f7da5ea5db73d2a68fc2dd91c414d14f951f565049e6f9f69a1e8",
    "signature": "0x3e2a7271e096c296ef8ff84dd8caf8ef9c0afbfa6f05691d1b5bbf22a9ac4af56e4a223cc0f10ad0d5c236396a0051c36b716a340dbedb27ce9c4459dfdf2cef1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}