{
  "manageEntity": {
    "action": "Save",
    "entityId": "902956049",
    "entityType": "Track",
    "nonce": "0xb87822cf8e9077aaea91d50e1bbc2e54bb2015fd93851b84f9f05bf65ec166bd",
    "signature": "0xd9320eb19af57b69f7fa60bedf4cd4f563c4e193cfc4509455162c812e7181317b7ce11109a631c5b49507ad77be1315f4043e661384444bdd568de60da5722a1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}