{
  "manageEntity": {
    "action": "Save",
    "entityId": "759868",
    "entityType": "Track",
    "nonce": "0x0fbb9f7e67a04affac1026440f4e5ce8de08e3d76fe481316262e1b0cdcd60f9",
    "signature": "0x639f09107a861389db97c5b59bb69daacc1789895f43e70bec6ad5e109f3cdaf23e522fc1a73e64f474284c9f2a7aea94fcf38c6231e235a9502394a1f275d811c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}