{
  "manageEntity": {
    "action": "Save",
    "entityId": "1687502903",
    "entityType": "Track",
    "nonce": "0x6284550228995e4b85084258aad964f33f952fb79bced152a74f4978f84ca851",
    "signature": "0x366a08e3ff629bc289ee3f47119fecc79cacd566a9e4029dc719b8d5ef8784bd1a63b3a8387783d0af49828f921fe994477b5e61b80ff425ea2e9efad33e1b6e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}