{
  "manageEntity": {
    "action": "Save",
    "entityId": "749708269",
    "entityType": "Track",
    "nonce": "0x6e43352a08c81ebe09230b56e15c7d0ff5667fb30718b521b1ce95826556f990",
    "signature": "0x9bb4a998c6256c658638c7b19efae4074527a4712c1ea6ccbf8cfa1604608ade2aa673c46662a699eff9975060d1701a0b3585a5ede5df701a4a44f08a2f451a1b",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}