{
  "manageEntity": {
    "action": "Save",
    "entityId": "444740233",
    "entityType": "Track",
    "nonce": "0x503611cf5dabb4485abb63b0372ab97cff5f82a77f784da0d31f16187215c757",
    "signature": "0xb86296e0abe1aadd40f589d1bb8cd117f54706b16fac83ad0edf229639c84a5748b49b0eca7999672df7e12faf2214381569164bc143f4549b6efe7d475db99e1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}