{
  "manageEntity": {
    "action": "Save",
    "entityId": "434043217",
    "entityType": "Track",
    "nonce": "0x5d11742de27dcdbf557854d3d0494f06b9573fe0b4dc37b93534a6731cd947f1",
    "signature": "0xbd136a807f5177048ab80d14ad13195b8cabc73e850eed3b6021f82fa65b0b8e3e4ea6a32aa34d752a82ec73764b2c3f0b0222fdafcf019ca2db34d09b6ad1dd1c",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}