{
  "manageEntity": {
    "action": "Save",
    "entityId": "2104425799",
    "entityType": "Track",
    "nonce": "0x539fb1d6b0633ea89e85625ea41945af28533ddc43241e38f9b0ce07e6968343",
    "signature": "0x3cab81efa488b27150ce9ec27bd6a47a954419fcfb4fefd832ec3af1a2d3bd2a67ebcc38354c4ef2321a48c24481b14163c288a35b341a831627bcdb41a579b61b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}