{
  "manageEntity": {
    "action": "Save",
    "entityId": "248354224",
    "entityType": "Track",
    "nonce": "0x7fe5cf53d647c9ab7a42db0326ca3b4ad8373fe0e08cea969d9e20401b443e67",
    "signature": "0x4518867764cf369d195929ceeaa5df54590b50e925c8f0aef3403637d151165c7d2ebadfba6a0c8d2a328cb1b1b25bd72d944c42c4e0c8cf1ab84631d3e0555e1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}