{
  "manageEntity": {
    "action": "Save",
    "entityId": "1290809007",
    "entityType": "Track",
    "nonce": "0x01d547e1dd1109298d257befb72dd517c32addea69054e1c13cc00004f2b5df8",
    "signature": "0x2e946eef3ba1a1a1576200a04e4ceb36755dd9282a53342046ec1c31603507e842cf04ee839b2aeeafd8354762feb6774e0232542a31989ea9ba3039fa42b0d21b",
    "signer": "0x1d868e2cc29848871636BdCF83a08A975835b6DD",
    "userId": "120328011"
  }
}