{
  "manageEntity": {
    "action": "Save",
    "entityId": "1257210880",
    "entityType": "Track",
    "nonce": "0xefe90cdbf9cf32cc13386f245e927cdddb8aad6d8b236c56882a33ffebdee520",
    "signature": "0x384bbb59c15f64a024f86b8de6bbd917180df2e63b4fe5eede4832d5b1e470e5201e3b07285dd120f257f7aa5688a78892269b9d9abdc63b85a06d9f192d64d41c",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}