{
  "manageEntity": {
    "action": "Save",
    "entityId": "532063828",
    "entityType": "Track",
    "nonce": "0xff4a3ba2886c597d9884ff9904496d7167a83554b45760d6d8933ecafed87a9a",
    "signature": "0xc0124c7f6cdab908fd19123c11f52db0178b9a892d9997c6aa71bb425f3cdc520807e7f907eabba3a1c78b0129457fcef07c8f8192ac98ea102f98aaeeb0a6d61b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}