{
  "manageEntity": {
    "action": "Save",
    "entityId": "558953071",
    "entityType": "Track",
    "nonce": "0x64a4771a0b20525b8910550e0363f39a49b450990410392201e98d9b8c90fe74",
    "signature": "0x1e26e557bf0e920bf7abc0c6b0630a3fae31a708fbc33d2e7753bd67e65f60a67def2aac2a174c14466530567887d11cbe78df15a3b3574ec8d91c9c157efedc1c",
    "signer": "0x55A4f450E154CFC8D853cA521F452162C3881349",
    "userId": "748511997"
  }
}