{
  "manageEntity": {
    "action": "Save",
    "entityId": "544189",
    "entityType": "Track",
    "nonce": "0xaf8f1d60e35ebecb8f38dbad1102208c6762008c15fc192b570afb971a541b7d",
    "signature": "0x8051dec06199b67787996b0085998be46af380dd51c648db7ef0fc9def1ad3d2174187966ace49016f092be9616b9da54479d8ce59d71b8ee45b5eb3548c5ea71b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}