{
  "manageEntity": {
    "action": "Save",
    "entityId": "1864487490",
    "entityType": "Track",
    "nonce": "0xa52fbd6b4520098ad9158f233c1d4d87440d2fa8462203f6fc096d3b8f4b9085",
    "signature": "0xc108da2e3e726626a4027d49b01aaf6a401a05b94d35dcde3c5f4f1be58abf005e5af7277c36249e94817486f95cdce1ab018d5b88e1fbc683cf3fc580c9d9291b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}