{
  "manageEntity": {
    "action": "Save",
    "entityId": "578479070",
    "entityType": "Track",
    "nonce": "0x9d3ab8bcdd4150fcaea37c05c2a465d450127ac433fd910a31ab8668876b0f89",
    "signature": "0xdd99939fbd544ef875ecadc1ad71ca5bfc45b1f65ae5af991b9c1eff70b62f5365bdecd6295edcac1d90a1e8f0b48c940f2df8dd3e3e0561836f163b9afca3aa1c",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}