{
  "manageEntity": {
    "action": "Save",
    "entityId": "663913479",
    "entityType": "Track",
    "nonce": "0x80c85aba6e38e0c4aeb38a720b3564c8659446321f53acab76dd13dffd3dc765",
    "signature": "0x8c3f91c55aa2c4520d3dd1686856e484858e7827989d4d6288ea01459b1dc78f2ddf39dd6a039e420e2802770617ed6bea3d4b2b303fea70d4f19f0364dba2151c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}