{
  "manageEntity": {
    "action": "Save",
    "entityId": "1905177054",
    "entityType": "Track",
    "nonce": "0x367fd7ad0f43d6dfa0d15f4e8fec52fdf62d91e380204e49423ae0faa1a3e885",
    "signature": "0x73a380e9d25b83fbf4801abaa0a134eb4ecbd15c2b6744495ae9fe1f41ae2455653677166c606c114b93a2353fc5abae771bb81b9d1c5e2721e425f9ec0a2bb11c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}