{
  "manageEntity": {
    "action": "Save",
    "entityId": "376563",
    "entityType": "Track",
    "nonce": "0x8790f013872d2353d82baf6fa4548fcef38e7a572a4089926c17cc2a30958e85",
    "signature": "0x3874e906007de9a4b36e1b61477ba5eaf655519870bf41bd81263e0157e5da6b1e5615740aa8de5c64b212a3efd2b8658cb88b68b02dd94d02f31e642dc6ad891b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}