{
  "manageEntity": {
    "action": "Save",
    "entityId": "1597619221",
    "entityType": "Track",
    "nonce": "0xc0a84961153c4d30218c039618fdd9851ea1a90a575a03b7ec54826e1c0220ee",
    "signature": "0x47aad46c0e7ec9966d8e250abc3dc7f02fb0180881f379ef38f38d1cfa99960e0895d8784758f55786b3d10fa6261ab7248ef9b8b4bf40fe4d3d53b17315b94b1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}