{
  "manageEntity": {
    "action": "Save",
    "entityId": "1213603164",
    "entityType": "Track",
    "nonce": "0xe3d6e6bb571473826cab82dff782d78056effe9303f349500dd9ab3cd61a4f1d",
    "signature": "0xd48c8cc1a20003cb066fc6aecc1e5e4a5b4209540a4ee0af2e575fdd41707eb46153c136ff81717f48fbde4f332db2850e2d9197c83a63c8301d938ad86359c11b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}