{
  "manageEntity": {
    "action": "Save",
    "entityId": "1493885618",
    "entityType": "Track",
    "nonce": "0x261668c8ed3068fb6f9e7fed7567f8e7dcb5ec8eaf41351404d1690982f3df1d",
    "signature": "0x7fa45b8df704a178ae53a5b3d6f66dd9cf3bce16f719ca8488d2a4a8f36172b5584e3ddf0468b86486fb1b4bceacfab86864b22a609f23f0dc90b66766e8b5f81c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}