{
  "manageEntity": {
    "action": "Save",
    "entityId": "668121976",
    "entityType": "Track",
    "nonce": "0x07ea4e4f06c826944f229023dd557b743e9285b27a7afd71cb9860cb0debc03b",
    "signature": "0x24bb9cb54b60468bdd75220c49eee8f296bf3acf8d7c5d856bcb055c7b852dc578fc4d52271d26d445486557ea2edcb00afc0f6a3bc868ac03e06a90e93e187a1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}