{
  "manageEntity": {
    "action": "Save",
    "entityId": "1688764036",
    "entityType": "Track",
    "nonce": "0x42bdcabfaf18cf853132eab4a19cf80cb6c33522ecdfe2f618229c68dd985aea",
    "signature": "0x5096ecafcbf6f7a6c9f660ebc16bcdc8c370a48e94fdda2bda3734db4bbc42fb4ff7bca05c5e0ccbf6b2d0a3fc019486d86bca0976261da13749e7143632a2b61c",
    "signer": "0xF08935327AeC6306C8d0eb92999567e5496848C9",
    "userId": "989073793"
  }
}