{
  "manageEntity": {
    "action": "Save",
    "entityId": "2145740277",
    "entityType": "Track",
    "nonce": "0x5c7827c930db4352d732413182b4a731b91be15c31d8a8adb9d8a6b122a98290",
    "signature": "0xfacd4355bf0ae5f6d10b36869bc4e28f188808acabadaf8838af2aefe44288cc07abab2be094bb0f521dca4d9a73bd120f0a7b9c64c6461b77f9e886a297cdb71b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}