{
  "manageEntity": {
    "action": "Save",
    "entityId": "602147311",
    "entityType": "Track",
    "nonce": "0xb02ea337d12e9f887ebec19f3826c621b861169a90d781dda02b36e7aa6a3e28",
    "signature": "0x537e901212840c6893ee3c28244e72b0b2b8d3ec2abf62c446672336a0c6d47330104804c7af6e822f16dd4c0c825e6513db4352423a97fbd44704090713222c1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}