{
  "manageEntity": {
    "action": "Save",
    "entityId": "1649753439",
    "entityType": "Track",
    "nonce": "0xa889aab6ca51c94cba1d3d44efc289a61c64a26f99ad63fa59b1d0eceb91ff23",
    "signature": "0x09d4184d513c221ae80809c0fb705e59bceb7dd9017a6b13d8b0309124294cb31d590c527d1dacdfcb80126f43d1b68c73691484be24abaa3d2438e7f17292c11c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}