{
  "manageEntity": {
    "action": "Save",
    "entityId": "1550524793",
    "entityType": "Track",
    "nonce": "0x47b344576584113b23b12a040746eb8d0b55da79eeca7f03fe68c2b33b90ddb3",
    "signature": "0x98eb82600a89e189a45f5b7a1102c806c7ebbc91deff3904c46e0baa206b85a77fea569f53809029a7fcb952d0659b28619fa615ad9e28147650ddff362330021b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}