{
  "manageEntity": {
    "action": "Save",
    "entityId": "480250",
    "entityType": "Track",
    "nonce": "0x6c65de43236eeb0684ede967560a7d2e53a9711d81f6b5b1df821473afcb8e7f",
    "signature": "0xe4eaee3d1d757b1f64ebb912ef30e5bd7838ec0c06a99c44821d4906d8b438814c41e919bcc2198a9bc46fa1718d0bd75ca49266627782f3d50b3ea8a13df4751b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}