{
  "manageEntity": {
    "action": "Save",
    "entityId": "480385360",
    "entityType": "Track",
    "nonce": "0xd9f9261e980cb3fe247f763f1c7269ddc530be9514393e61263f1279e73b55ba",
    "signature": "0xb2c0b87b895294b1ca8439923d1b6fa00cee6496057f5ce5e23b554613d109ab176555e6664600427609b83d3f1223ba7890575606a0e8248dcbc72337d0c66c1b",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}