{
  "manageEntity": {
    "action": "Save",
    "entityId": "252573",
    "entityType": "Track",
    "nonce": "0x01f1ea1f22d87c2db823b7c032f1e42216558e942bc9c860de80c3b1c26b2a9f",
    "signature": "0xbcf52d06f05a3db3f682a15b89b164d94a037389c04941e680865a6aab7727166f7c3096d4d86df0621ac985ee7a85489e8e0b9247042fb8e56fd22487aeac411c",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}