{
  "manageEntity": {
    "action": "Save",
    "entityId": "355107570",
    "entityType": "Track",
    "nonce": "0xb0636f73933c080b96206e48aa9d48bbc50975b272e8e47dae033d7700723515",
    "signature": "0xa5a5b96e1323dd6bbe18a56dcfabfcc0d03a0cef4509b9e7dcd458b3b3b6be9f05de064878d24da233a537fb9651f79673949d5f23331815c4b082dfd54bb4131c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}