{
  "manageEntity": {
    "action": "Save",
    "entityId": "291744730",
    "entityType": "Track",
    "nonce": "0x95d0f44a58e1b6558652b12516f028918c95dcf8e45afcab4b45c0e68edf2d74",
    "signature": "0x0a195dfdb685f2b42df4a8d41bd3720665b9988840a8fa8c01c3ee88ecc18e065d99f6013bf244552f01766ad5784e4677ad84577aea59f9a697c5dfafa28c3a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}