{
  "manageEntity": {
    "action": "Save",
    "entityId": "450190671",
    "entityType": "Track",
    "nonce": "0x3b7ff3a597ff47895e9123b56acf197f5f7bfc61d39c238ef6d461638ba2c856",
    "signature": "0xc185cea8fcc6d5a5724bf5e390fc3befdd8e7b16fc7af66a315b8b2356a208e0647f732cf8ae1395e2d2d669330c47007d49a005a13200dbe0298f4ef08795151b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}