{
  "manageEntity": {
    "action": "Save",
    "entityId": "390269799",
    "entityType": "Track",
    "nonce": "0x9180c02cee2264ebf97f04ea47765eeefcf25ec834ef2c8d515e4509435694c9",
    "signature": "0x7efaf25d2a6dab6e8d1675758fead333085fc17e2d9f93a08e70e51af1e87e8e0f838dbdba81d24a79142e1b15bc0242450092e4ca0511f7754841767ff0f9bc1c",
    "signer": "0xC7B16Eee24C03712c67aa884907593f4df23db87",
    "userId": "56534466"
  }
}