{
  "manageEntity": {
    "action": "Save",
    "entityId": "445867891",
    "entityType": "Track",
    "nonce": "0x8dd7cefad3e31056febfc7410ea029691da3452797189947c6db60a1f1f68d74",
    "signature": "0x01f3f671c61b06843c1fd484c9f9f0525ef14185b11ec55447a3483647b8da2610a8073475ac7eebaf860d01424af702a0787a38f7667cab92ba3c0d1254e1c01c",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}