{
  "manageEntity": {
    "action": "Save",
    "entityId": "1819871426",
    "entityType": "Track",
    "nonce": "0xe5625238359c403e7edc2080e4c62713fc8711120c382b6eb9f66954bf75a178",
    "signature": "0x9f1088d22a1253d2880da8b7b01f9f4a02b801120ed4f8110559a69666599d100e2f9c1f81bfb2ca41b6b51a125e2e12f71184d0e55dde5a269f2f7c5f1585e51c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}